I'll cut to the chase (I'm pretty busy working on sprintTracker, my little python program to track sprinters times etc), I'm responsible for some 10 wheelbuilder.com track modified Powertap hubs, two are mine, the rest belong to the VIS, the NTID and Hilton Clarke.

There's a small problem with them involving the chainline.  We never noticed it on mine because it's only about 3.5mm out and I'm no great torque machine and both my and Emily's bikes have reasonably long chainstays so the chainline problem doesn't really show up. However, under some of the NTID and VIS boys who have real motors we hear noises at high power outputs, so we investigated the chainline of the hubs.

Best illustrated with a couple of (poor quality!) photos :

	That's what they look like
	That's what it should look like

 As you can see, even with my crappy mobile phone photography and quickly cobbled up bit of cardboard measuring device, the PT hub puts the sprocket about 3.5mm (the width of the lockring) too far towards the middle of the bike.  I think the guys at Wheelbuilder made a mistake reading the width of the hub and assumed that the sprocket was where the lockring is,  which it isn't. Most people would never notice, the 3.5mm deviation is small and under enduro riders would not show up at all, but put them under a big sprinter putting out a lot of torque and it makes noises and runs rough.

The fix is pretty easy, the hubs have a steel axle end cap that you can see in the top picture (with the flat side to allow you to do it up), that needs to be 3.5mm shorter and the other side needs to be 3.5mm longer.  Then, all the wheels need to be re-dished.  Bugger, most of them were put together by Daryl Perkins and he tied and soldered them, which is a PITA to re-do.

Anyway, these things happen and I'm sure the guys at Wheelbuilder will send us corrected end caps ASAP.  They're smart people and proud of the work they do, they'll want to take responsibility for this and fix it.  In the mean time we can machine down the existing drive-side end caps and put washers under the off-side ones.  It's fiddly and shouldn't have to happen but this is prototype and first generation stuff, we expect a few teething issues.  It's the price of being on the bleeding edge.

Everything on bicycles is at least 10 years behind motorcycles and cars.  The Kamm Tail was originally developed in the 1930's in Germany.

Now it's showing up on bicycles!

Our distant cousins over in triathalon-land think aerodynamics matters, and they're right, but it REALLY matters at 60+km/h in sprints.  Will this technology make it into sprint bikes? 

Trek carbon track bike?  We've seen pictures of Tyler Phinney on one.  Word on the street has it that it may end up in production....

Blackburn club rooms finally getting some new carpet?  Rumour has it it'll be done on Friday!

Fun times!

The current generation of Powertap road power meters (the wireless 2.4GHz ones) mostly come with an aluminium alloy freehub body.  After not very long this happens to them.  Sucks ... It's because making an alloy freehub that works with both 9 and 10 speed Shimano cassettes compromises the design of the freehub.  Of course, the weight weenies want light hubs ... so for the sake of 80 grams (I weighed both the alloy and the steel freehubs today) all but the bottom end Powertap comes with this stupid alloy freehub.

But!  For around $200 or so (in Australia, from a Trek dealer) you can get the PT Elite+ freehub, which is steel (and ... yes ... 80 grams heavier) and swap it into your higher end hub and eliminate the problem!  Win!  It should not cost what it does, but that's not something your LBS can do anything about, wholesale these things are insanely expensive, but they are available and they mean you can swap cassettes with just the one chain whip!  Nice .. when something works like it should.

Enough ranting .. My PT 2.4 is now upgraded to a steel freehub and I'm happy about it.

In the UK, at the Manchester velodrome, they have rules about what tyres you may use on the track :

• Use Continental, Schwalbe, Tufo or Vittoria clinchers or tubulars (black tread only), 21 mm wide or better.

  Recommended clinchers and tubulars
  Make	Model	Width	Make	Model	Width
  Conti	Tempo	22mm	Tufo	S3 Pro	22mm
  Conti	Sonderklasse 165/175	22mm	Tufo	S3 Lite 135	21mm
  Schwalbe	Durano T	22 and 25mm	Tufo	Elite 120	21mm
  Schwalbe	Ultremo R1	22 and 25mm	Vittoria	Pista EVO CS	22mm
  			Vittoria	Pista EVO CL	22mm

• Tyres must be inflated to 8 bar (119psi), and the pressures, and tyre condition checked regularly. Do not use Michelin tyres or any dual compound tyres or tyres with coloured treads. Other tyres and tubulars may in future be recommended after analysis. Do not use tub tape to fix tubulars to sprint rims – use proprietary rim cement.
• Do not use brand new tyres on the track without first preparing them thus; rub the surface with alcohol or white vinegar or other degreaser before use. Ride the first three laps on the Cote d’Azure or bottom of track.

(which we use), but as a general principle, I think it's a good one.  There's far too many low speed crashes on the boards at DISC and I strongly suspect that poor tyre choice is a significant contributor to this.  I was watching one of the NTID lads trackstanding on the bend last night doing skills work, on a Diamonte Pro Light.  Try that on one of those crappy Michellin Pro3's ... Manchester bans them! :

·         Only use Schwalbe or Continental clinchers or tubulars (black tread only), 23 mm wide. Do not use Michelin tyres. ·         Do not use brand new tyres on the track; rub the surface with alcohol or white vinegar or other degreaser before use. Ride the first three laps on the Cote d’Azure or bottom of track.

heh!

You can see the full Manchester recommendations here.  Worth a read.

Many of you know, and if you don't, you do now ... I'm a bit of a fan of Trek bikes.  For a long time they've only had an aluminium frame track bike (the T1).  It seems they now have a carbon one .... It looks like an Equinox TTX with track dropouts.  Interesting ... I have our local Trek rep on the job to find out more.

I wrote in my last blog that, amongst other things, it's not about the equipment.

Except sometimes it is ...

It is when the equipment is a limitation.

If you don't trust your equipment, especially in a sprint situation which demands 100% commitment, you cannot perform at your best, and then it is about the gear.  When your equipment is a significant limitation, change your equipment.

I have an FFWD 5 spoke front track wheel.  It is being returned to the local distributor for a refund. I don't trust it.  The first one I got about a month ago, Pete and I glued on a Tufo S3 lite tyre, I took it to DISC and jumped on after some quick photos for Ride magazine.  It immediately launched into a resonating tank-slapper as I got onto the bank.  I took it off, put on the old Bonty front and got back to training and coaching for the day.  Later, Nathan Larkin and I pulled it apart and found that the bearing/axle fit was fractionally loose, and there's no way to adjust it.  Ok, send it back to FRF (local distributor), they send me another one.  This one's still got a little bit of play, but it's better than the last one.  Glue it up, wind it up at Blackburn at round one of the aSSS for my flying 200, I'm 100% committed to this effort and am going absolutely as fast as I can in almost perfect conditions.

At full speed, it does the same thing the last one did, almost putting me over the fence.  I was very lucky not to crash.

We had a look at it afterwards and the bearing/axle interface has play, enough to allow a resonance it seems.  What a seriously brain-damaged design this is.  A ~$3,000 retail wheel which has no way to alter bearing tightness.  The Mavic iO has adjustable bearings, which means manufacturing tolerances (and wear!) can be adjusted out.  Not so this design. It's a POS.  Don't buy one unless and until they redesign the hub such that you can adjust the bearings.

Not that you probably need one anyway, I don't need it, I need something I can trust, which isn't this wheel. If you're thinking about it, think again.

I know I've banged on about this before, and I'm going to bore you again with it.  We debut'ed the new powertab wheel last night at DISC.  I'm no stranger to training with power, I've had a Powertap SL 2.4 in a road wheel for a couple of years now and it's a great tool there, but my emphasis these days is track and once you've trained with power, it's very frustrating to not have it.  

After a bit of show and tell as a few of the Sunday Roast diners had a look at it and asked me a bunch of questions I either didn't know the answer to (How much will it cost? How does it work? "same as all the other PT's!" Is there a Zipp 1080 option? How much is that doggy in the window etc) or wasn't at liberty to discuss (How much did I pay for it?!) or wasn't going to answer yes to ("Can I borrow it next Sunday?" No, but you can hire it!) Nath showed up with the valve extender and we put air in it and I slapped on a 17 tooth sprocket.

As with any new toy, I was a bit mesmerised by it, doing the warm up on a damp track (yes, DISC still leaks .... the irony of an indoor velodrome that gets water on it when it rains!) we had to dodge a wet spot (cue the jokes, now ..) at the end of the finishing straight and I had to pay attention to riding, not looking at the computer all the time. I wasn't going to be the first to test the hub in anger though, that was Emily's job.  After we warmed up she was set to do a 500m ITT and we popped the gate on the track and the wheel in her bike (and the computer up her sleeve!).  A 10 count, and she's away at full torque for 500m (two laps of DISC).  She rides a great time on it which would have won her last summer's JW15 state titles again, but by more (2 tenths faster than her Vics winning time last summer).  No worries. 

My turn.

Our sprint training for the day is low speed jumps.  This'll show if the guys over on FGF's fears about axle slip are real.  I'm matched up with Rob Tidey, on 91.8".  From 6km/h to 50km/h in 10 seconds, peak power 1501 watts, peak crank torque 199.6nm.  No movement.  No worries!

To be sure, we did this 4 times.  Still no movement.  I'm very far from the strongest track sprinter around, in fact I'm a 'never was' and a hack at best,  but that was a pretty good test and it passed with flying colours. Arr, it's nice to have power again!

The rest of the session went well, except we cut short the finish as the track was slippery and damp and we had a tumble during a practice sprint.  Everyone was toast anyway so no-one felt like they wanted more track time.

I took the laptop to Nandos and grabbed the data.  Here's what my 4 low speed jumps looks like

I can't show you Em's data, that's confidential, but I can say that the meter allows us to see where she's really strong and what we need to target to get her faster much more than we've been able to with simulated stuff on the road Powertap on an ergo.

The device isn't perfect though - rare indeed is it to have a version 1 of something that's 100% sorted.  It comes with bolts instead of the more standard axle and nuts and these can be a bit fiddly to do up when setting chain tension.  I spoke with Rich from Wheelbuilder today and he's going to address this with a set of studs and he tells me we'll have the first ones to test out. Also, and this is nothing to do with the track adaptor Rich made, Powertaps do tell you cadence, but in the same sort of 'random number generator' sort of way that Polar and iBike do power - ie: not reliable.  If you're interested in cadence and can't be bothered working it out from speed and gear, get the Cyclops cadence sender as well.

I'm not going to make a fuss about the rest of the wheel, it's an Edge Composites 68 carbon clincher laced with 32 Sapim CX-Ray spokes by Wheelbuilder as per our spec (build it strong, Rich, it's going under heavy sprinters!).  As I'd expect it was stiff and felt fast.  With a Veloflex Record at 140psi it felt just as good if not better than the tubulars I run on my regular indoor track wheels (Bontrager carbon track rims with Tufo S3 Pro's).  It may be faster, it certainly looks fast and feels as stiff as anything else I've ridden except the disk wheel. The White Industries sprockets look solid and feel reassuringly heavy.

So, overall, I'm very happy with this device.  At its first outing it's providing us with very valuable information which will help us all to go faster and that's what we want to do, and it's around half the cost of an SRM crank system here in Australia.  For us, this is a win, thankyou Rich Sawiris!

The wheelbuilder.com Powertap track wheel has arrived.  It's the only one in Australia at this time and one of the very first of this version in the world.  Wheelbuilder did a fixie adaptor for the first generation of Powertaps but they've been unavailable for quite a few years now.

Now we can swap wheels on track bikes and get power readings.  From now on, a laptop comes to every track training session and we're no longer guessing.  I need to work out a hire price structure for it.  It's a very nice wheel, Edge 68 clincher rim (60mm deep carbon clincher), Sapim CXray spokes (32), Powertap SL+ hub with Rich Sawris's fixed gear modification and White Industries sprockets and carrier.  We chose a clincher so that we can quickly and painlessly swap tyres for indoor and outdoor use, it'll have a Veloflex Record for DISC and probably a Bontrager Race-Lite for outdoor use.

For some time my Saturday racing has been even worse than I expected it to be.  I didn't think to check the bike, after all I keep getting faster during sprints.  But, on Saturdays I use my old wheels, for sprints I use the bling bits.  Adam needed to borrow a wheel on Sunday so I passed him my old back wheel, only to have him say "I'm not using this, it's seized!" or words to that effect.

Sure enough, it was.  I guess it had been like that for some time. It could be turned, but not by hand at the axle.  Very tight indeed.  Hrm.

I put new bearings in it today and set the locknuts correctly which might help a bit!  Look out Dino, I may get a km/h faster in our warmups now the bike hasn't got the brakes on.  Woohoo!

Not quite off-topic. I'm trying to work out how much energy gets burnt up doing strength training in the Powerhaus and the Mermet etc.

So, today, squats.

I did :

12 x 20kg (empty bar)

8 x 60kg

5 x 100kg

5 x 5 @ 145kg as my work sets. The prior sets were warmups.

Depth is I think ~0.8m, I'll take that as a good enough guess for now.

How much work is that.  in terms of tonnage it's really only worthwhile to look at the work sets, so I lifted 3,625kg as my working load.

That's one measure, but it's not all that useful really. My 1rm for these full squats is probably around 163kg if I use Brzycki's equation to extrapolate from my 5 rep sets, which isn't 100% accurate, but it'll do... So I'm lifting ~88% of 1RM 25 times.  Reasonably intense.  But still not what I'm interested in here.

Work is defined as force x distance

Force is mass x acceleration

Mass is easy! 145kg ... Acceleration is gravity, 9.8m/s^2 - we'll assume the weight is moved upwards slowly, it's too hard otherwise.

Distance is 0.8m

So our force is 145 x 9.8 : 1421 N, which gives work as 1421 x 0.8 : 1136.8 joules - roughly. Let's say 1100 as close enough (conservative estimate).  25 reps all up at that weight : 27,500 joules.  Roughly 27 Kilojoules. Is that much? Nope! The human body is around 25% efficient.  So to get 27 Kj the body will use around 4 times that, so roughly 100Kj. My BMR is around 11,000 kj per day. 100 kj isn't very much!

This lot of sums doesn't take into account the energy used to build muscle after the training session, the effect of extra muscle on RMR and BMR etc, it's purely a rough (very) estimate of how much energy gets used to do these lifts.  Have a look at wikipedia's brief summary of EPOC for more on post exercise energy use.

Power's another interesting measure.  If I assume I'm lifting the weight in ~1.5 seconds (pretty close, but I haven't timed it), let's see how many watts that is.

Power is work / time

So for a 145kg squat, lifting 0.8m in 1.5s, what's that in watts?

We already know work from above, each rep is about 1100 joules, divided by 1.5 seconds, that's about 733 watts.

Compare that to a 50kg clean, where the weight moves from the ground to the shoulders (in me, that's about 1.5 meters), in a second (a clean is very quick).  Work : (50kg x 9.8m/s^2) x 1.5 : ~735 joules - not much compared to the squat at 145kg, but it is a lot less weight (to get the same work, the clean would have to be ~75kg), power is, assuming 1 second for the lift : 735 watts. That's more than the squat at 145kg. It's no wonder that 5 reps at 50kg doing cleans feels as hard as 5 squats at 145kg!

It's so much easier to do these sums on a bike, Powertaps and SRMs make it a doddle ... They just tell you the numbers. For weights work, one of these does, but it's not cheap and it ties you to their website where they store your data - no thanks.

 We had a good night at DISC tonight, everyone did sprints! Fun!

My new disk wheel has arrived - a Shimano 'pro' track disk.  1185g with no tyre or sprocket (measured on digital scales by me just now!). It's a lenticular disk, and I'll be putting a Tufo S3 Pro tyre on it and making it availabe for hire.

Yesterday, the powerhaus and I rip out 4 sets of 5 @ 145kg deep squats, not bad.  Then some bench, 102.5kg, 3 sets; 4, 3 and 3 reps - that extra 2.5kg is a lot! I was doing 5,5,5,3 at 100kg last week.  Thursday is power day, squats in the morning then olympic lifts in the afternoon at the Mermet center in Hawthorn.

Then Nath takes me to spin and we run the session together as usual this year - 3 x 10s big gear sprints and then 3 x 30s sprints.  I manage a peak output of 1,375 watts. Ok, I wanted 1,400+ but was tired from the squats, that'll do, I've been consistantly improving over the last few weeks and am about to start focussing on more power than strength - the Powertap says around 180nm of crank torque which I'm happy with.  Nath swaps in and rips off a big PB on the watt-o-meter, top stuff Nath!  The bolla sauce was noticed to be a bit bland (I ran out of chilli) - so I promised the troops I'd double it up next week.  I think they thought I was joking ...

My clothing order's going to be delayed (again!) - Rowbust, who make them, get their printing done by Giramondo, and apparently there's a problem with the digital printer.  It's supposed to be being looked at today.  I hope it's a quick fix, one of the lads wants his skin suit for an ITT coming up soon and everyone wants them for the first round of the Bontrager Summer Sprint Series.  Speaking of which we're going to do a practice day the weekend before it, on the Saturday 27th Sept.  Details are at the website, as usual.  Free BBQ courtesy of aboc for all that come and have a go...

The Blackburn Summer of Track promo cards arrived yesterday too, so I started handing them out last night at Spin.  Congrats to Jamie Goddard for winning the Blackburn elite road championship out at Modella. Thankyou to Carnegie-Caulfield for running the event. CCCC really do set the standard for quality and number of road races in our combine.

Finally, I'm ordering a lenticular disc wheel, a Shimano 'Pro' wheel for track use - it'll be available to hire and borrow for selected events soon.

From Cyclingnews.com today, the good news is Saris are updating the Powertap SL 2.4's to use full ANT+Sport wireless (previously only ANT with their own propriatory protocol).  This means that you'll be able to use a PT hub with a Garmin 705, Qranium etc.  They'll be releasing an update to the older PT SL 2.4's to talk ANT+Sport 'soon'.

They've also seen some sense and got one with a steel freehub, so no more dig in.

Read about it here.

Looks like they're also throwing down the gauntet at Kurt Kinetic with an updated line of trainers.  Their older Fluid 2 is inferior to the Kurt Kinetic Road Machine, I wonder how the new one will go?  I'm keen to get my hands on one for a look and a play. They do say 'the PowerBeam Pro resistance unit offers sustained resistance of over 1300W', so reading between the lines it's not a sprinters toy (1300 watts? pah!), but for enduros, maybe it's competitive with the KKRM or some of the TACX mag trainers.

In other news, Nath and I will be at DISC tonight for our first races since last summer.  No promises of any sort of form, I expect to be flat and slow, especially as I have a strength session to do this afternoon before I head out to DISC.

FFWD (Fast Forward) track wheels.  They look pretty snazzy.  No-one seems to be bringing them into Australia (there's a Kiwi agent though .. go figure!).  Maybe good value competitors for Mavic's IO and Commete etc?

Black with red goes well with a Trek T1 ... hrm ... got a spare $toomuch for these babies?  drool ....

It has arrived at last!

Check this out :

http://www.badbean.com/cyclingstuff/spd_straps.htm

Now that's a neat solution!

In sadder news today, I learnt of the death of Sheldon Brown. I never met him in the flesh, but had a few email and newsgroup conversations with him, and he was a very good bloke.  Sheldon will be missed.

It's only taken 3 months ... but my new Truvativ Omnium track cranks have finally arrived.  Just in time for me to not be able to use them this w'end (injuries .. doh!).

I might fit them, and at the BBN track races this Saturday, start each race and pull out (the things we do for aggregate points ....).  I doubt I'll be able to ride much, but I can start each race.

Offtopic, I voted yesterday at the local AEC office.  It's always good to get that out of the way before the election. Last minute desperate political ads? Meh ... I've already voted ...

On the injury front, my skin is healing well under the Mefix, ribs are taking a while (it's only been 4 days I guess) - it feels like I've torn something soft, there's no pain except when I have to move or use the muscles on my left side.  Then, a very sharp pain.  If it was a break or bruising it would ache all the time as well.  A couple of weeks, I hope, and all will be well. 

The Fuel EX8 has been delayed - Trek are now quoting the 27th of Nov.  Just in time to be able to ride it, maybe ...

How many of you have noticed that of late (maybe the last 2 years or so?) there's been a big surge in interest in LBS's (local bike shops) in the women's market.  Many LBS's are now stocking bikes designed for women (with varying philosophies behind the different designs) and many have a seperate section for womens bikes and seperate sections for women on their websites and so on.

It seems a pretty good idea.  Around 50% of the population are female, and there's no reason for women not to ride as much as men, and from my rather limited look at it, in other countries there's a far greater proportion of women cycling than there seems to be here in Melbourne. It seems like a pretty good market to try and tap into and to encourage and even maybe a bit of positive discrimination in some areas to build momentum until it's a bit more self sustaining.  I think that in the racing arena positive discrimination re use of resources etc is worthwhile - Lawrence's efforts with the women's intro to track days etc will hopefully pay off with enough women staying around to maintain a critial mass of female riders racing.

So how about bike shops?  Should there be a seperate section in a bike shop, or even, a whole seperate shop? At what point does this become patronising or even limiting? Does it at all?  I don't know, but something about it makes me a little uneasy.  Why?

If you take a look at the majority of the womens specific road and MTB bikes, they're mostly in 'girly' colours.  Pale blues, pinks ... because ALL women like pale blue and pink, right?  (and for some imaginative reason, almost every manufacturer calls their women's range 'diva', good-o ...) The big difference in roadies and MTB's is a shorter top tube, but with hybrids etc often there's also a lower top tube (which, funnily enough, is great for older riders of both genders, they're a lot easier to get on and off if your flexibility isn't what it was), there's also a significantly smaller range of roadies and MTB's in the womens designs (of course, Trek customers can get Project One bikes, but they cost a premium and are only on the high end bikes, and lag behind the current models a bit ... where's my P1 '08 Madone?! I WANT!).

That's a reflection of demand though, if there was demand, there'd be more range, and if the range was there, maybe there'd be more demand?  Chicken, meet egg ...

That's not really the issue though, at least, not what I'm writing about anyway.  Women have as much ability to ride as men, apart from at the elite racing level, there's plenty of women who can drop me in a road race, that's for sure!  We race together mostly, certainly at amateur club level there's generally no gender separation, and we ride together, so why should we not also shop together?  Why should women's bikes be banished to the 'girly section' of a shop?  Apart from the fact that WSD bikes aren't necessarily the right fit (all women are not the same shape!), sometimes a WSD bike is a better fit for a male rider (just remove the women's logo etc off it so no-one knows!).  By seperating the bikes out, perhaps that creates a barrier, and I'd rather see riders try bikes with an open mind.  Trek did this with the '08 Madone's 'performance fit', where the penny dropped that very few riders actually ride a bike that's set up for a euro pro rider, but they all want to look like it, perhaps the same can apply to shorter top tube bikes also.  I guess what I'm trying to say, in a roundabout sort of way, is that by seperating out the bikes by gender, do we limit the choices that riders of both gender then have? It may be only a mental barrier, but is that a bad thing?  What are the pros and cons of a gender-segregated bike shop?

Between sniffles, coughs and other 'flu related symptoms, it's done, I've written a review of the '08 Madone.

Read it here if you're interested.