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PostPosted: Fri Sep 13, 2013 4:55 am 
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Location: Ruidoso, NM
I've seen so many atrocious fits by "pro fitters". Atrocious for aero that is... maybe not so bad for comfort.

All the fast people I know have fit themselves via trial and error. IMO getting the aero part right is the first priority. Then you work on what you need to do so you can make power when you are aero, and ride a lot in that position so it *becomes* comfortable... enough.

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PostPosted: Fri Sep 13, 2013 6:34 am 
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Didn't Chris Boardman fit himself in front of a mirror and side on? Worked for him with no wind tunnel?

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Posted: Fri Sep 13, 2013 6:34 am 


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PostPosted: Fri Sep 13, 2013 7:20 am 
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Joined: Tue Jul 18, 2006 5:18 am
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Location: Cambridge, New Zealand
Would be looking to change saddle to encourage pelvis to rotate forward - effectively lengthening torso to allow a little more room to manoeuvre between elbows-knees. Need more support from bars to facilitate shrugging. Sort those out and going lower will be fairly easy (in terms of body tolerating it).

Best thing you could fabricate would be a stem system to get replace the stupid tri-angle they have. Failing that - there is room to go lower with lower stack bars - Brezzas are quite tall (over 50mm min pad stack).
Pin number lower.
Selector is often not the fastest option.
Lose shoe covers? Alphamantis testing is showing they're highly individual so can't be counted on as a benefit.

I'm going to agree with Ron about 'fitters' that ignore aero. And then disagree - because that is *my* primary focus when I am doing a TT/Tri fit.

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PostPosted: Fri Sep 13, 2013 8:52 am 
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Formerly known as wassertreter

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dereksmalls wrote:
Here's a pic of Dan setting a new course record in a local race around here on the bike in question

Those calves got to have some drag :mrgreen:

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PostPosted: Fri Sep 13, 2013 6:08 pm 
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Raise the seat a few millimeters and scoot the seat forward as much as possible. It will flatten his back a bit and open his hip angle, making it easier to create the watts. Lower the front end if he can. If not, tilt the aero bars up slightly. I wouldn't honestly change a whole lot if he has been racing a lot in this position. Small increments if anything changes. If he likes the change, go a little more. if not, return it back to normal. It helps to go out on the road with the bike with a multi tool and make changes as you ride.

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PostPosted: Fri Sep 13, 2013 10:58 pm 
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Use track skewers, maybe? I've done that myself, but is that any more aero than say using zipp's ti aero skewer?


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PostPosted: Fri Sep 13, 2013 11:54 pm 
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Remember this is the National TT title, So it must comply with UCI rules. Also do track skewers release quickly or are they locked in? It would suck losing time if he got a puncture and couldn't get the wheel off

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PostPosted: Sun Sep 15, 2013 3:21 pm 
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Location: Bristol
dereksmalls wrote:
Didn't Chris Boardman fit himself in front of a mirror and side on? Worked for him with no wind tunnel?


Dr. Hutch told me that the way racers used to get aero would be to take a photo head-on and then cutout everything but the rider and bike. They would then weight the photo. Less frontal area = lighter photo :mrgreen:


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PostPosted: Mon Sep 16, 2013 4:25 am 
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THIS is why I read this forum!
Awesome thread


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PostPosted: Tue Sep 17, 2013 6:47 am 
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Grill wrote:
dereksmalls wrote:
Didn't Chris Boardman fit himself in front of a mirror and side on? Worked for him with no wind tunnel?


Dr. Hutch told me that the way racers used to get aero would be to take a photo head-on and then cutout everything but the rider and bike. They would then weight the photo. Less frontal area = lighter photo :mrgreen:


Scientifically accurate hahahaha

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PostPosted: Tue Sep 17, 2013 8:47 am 
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weeracerweenie wrote:
Scientifically accurate hahahaha

You're laughing, but plotting, cutting out, and weighing graphs was not unheard of in engineering, before numerical integration worked well enough.
Just because a wind tunnel is a huge and impressive machine doesn't mean there's not a whole bunch of things that can go wrong and give you wildly inaccurate measurements.

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PostPosted: Tue Sep 17, 2013 10:03 am 
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Location: Geeeelong!
Could it be applied digitally? With pixel height and width?

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PostPosted: Tue Sep 17, 2013 10:46 am 
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Location: Shetland, Scotland
dereksmalls wrote:
Remember this is the National TT title, So it must comply with UCI rules.

Cover the valve hole on the disc with a sticker from the wheel company.
Insist that all riders with valve holes covered by tape/stickers NOT from their wheel manufacturer are DQ'd, as per UCI equipment regulations.
Half the competition gone already! :wink:


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PostPosted: Tue Sep 17, 2013 10:58 am 
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Not sure how that would go down with the commissaries. If it's the commisaires I know, he wouldn't stand for that, he made me add 2 kg of lead to my bike to be able to race the local schools series here last year. I won 11 of the 13 races in our region with 1892grams of lead in a bottle. And he weighed it to check. But removal of valve extenders and taping over is an awesome idea! Thanks!

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PostPosted: Tue Sep 17, 2013 11:12 am 
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Location: UK
Tinea Pedis wrote:
Could it be applied digitally? With pixel height and width?

Yes, using image software (Paint Shop Pro etc) outline the rider & bike & remove everything else. The picture now contains a certain number of pixels (automatically totaled). Modify position, take another photo, edit & count the pixels.

The hard part is to take the photograph from the same position every time.


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Posted: Tue Sep 17, 2013 11:12 am 


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