Gashman wrote:
nslckevin wrote:
zedzded wrote:
RichardL wrote:
zedzded wrote:
This is written like you'd jump on a bike with taped wheels and go 5km/hr slower. I'm sure the CRR data out there shows tape is slower, but really how much are we talking?
7.5 watts per wheel at 6 bars or 87 psi. Unlike most of you beasts, I can't afford to give up 15 watts. Heck, it would take me a month or two of hard interval training just to gain 10-15 watts.
Done in a wind tunnel with a $20k bike, specific wheels, tyres, a pro cyclist wearing a speedsuit and $1000 aero helmet... I don't think the data they get translates well to real world. An experienced triathlete is going to feel a 15w difference. Ride a set of $20 tubs with tape on, butyl tubes and over inflate them. Are you really going to be losing 40, 50w...
Um, wrong.
https://www.velonews.com/...ing-resistance_12493
You're missing his point. The scientific data says X, Y and Z should be this much slower. Real world, people aren't experiencing that. Andy Potts is a great case in point:
2015 - 4.32 12th fastest bike
2016 - 4.35 - 14th fastest bike
2017 - 4.31 - 15th fastest
His best performance was on Gatorskins with butyl tubes...
That article wasn't scientific data. It was a guy doing roll down tests on two sets of wheels. In fact, the wheels with tubular tape were 404's and still rolled slower than the other set of more conventional training wheels.
Maybe if Potts didn't use such shitty tires and tubes he would have gone faster. This isn't rocket science and it's not voodoo, it's real. If you don't want to believe it, fine, go ahead and ride slower than you might otherwise.
BTW, Mark Allen rode a 4.29 bike split in 1993. See the times here. Maybe Potts would go faster if he the same bike that Mark Allen did in 1993.
Kevin
http://kevinmetcalfe.dreamhosters.com
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