this has already been done.
Edit: adding some commentary to explain what I *think* these charts mean
work by Tom A. at www.bikeblather.blogspot.com
1) Interesting chart showing that a) the Roval CLX 64 w/ Turbo 22mm is a very competitive wheel, and that the HED Jet 6+ is comparable with same tire, and b) the 24.25mm wide TC is about 2.5 watts slower than the Turbo 22mm, tracking with my SWAG ROT that 1mm = 1 aero watt in tire width. Also confirms what we already know about vulcanized vs. open tubular tire designs at wide yaw angles.
2) OTOH here you have data showing the TC 24mm is equal to another tire, the so-called aero gold standard GP4000s 23mm at zero yaw. Also interesting is that the Turbo 24mm is slightly faster, leading me to believe that the Turbo series of tires have some magic aero properties that their Turbo Cotton "open tubular", a known poor performing design with regard to aero, does not have.
That said, the tire is a system, with both aero and Crr (and watts to spin, another story). This chart shows how good the Turbo Cotton 24mm tire really is with Crr data overlaid. The 24mm Turbo Cotton loses a watt or two from aero penalties, but gains 5 watts back at 40kph and 7 watts back at 50kph.
4) finally we have a chart depicting aero, Crr, and weighted yaw angles based on Mavic testing showing that at pretty much all speeds, the Turbo Cotton 24mm is fastest as compared to the "gold standard" GP4000s 23mm.
All this, combined with the knowledge that GP4000s 23mm = Turbo 24mm < Turbo 22mm in aero (first + second charts) and likely same in Crr (Tom A.'s Crr charts), leads me to believe that there's never really a good reason to run the GP4000s 23mm anymore. Same conclusion when you process Zipp's data that 22mm Attack > 23mm GP4000s > 25mm GP4000s in aero, and also Tom A.'s data that shows the GP SS 23mm is not too bad aero wise and VERY fast Crr wise.
Where have you seen aero tests of the turbo cottons? I would love to check that out.
Eric Reid AeroFit | Instagram Portfolio
Aerodynamic Retul Bike Fitting
“You are experiencing the criminal coverup of a foreign backed fascist hostile takeover of a mafia shakedown of an authoritarian religious slow motion coup. Persuade people to vote for Democracy.”
Edit: adding some commentary to explain what I *think* these charts mean
work by Tom A. at www.bikeblather.blogspot.com
1) Interesting chart showing that a) the Roval CLX 64 w/ Turbo 22mm is a very competitive wheel, and that the HED Jet 6+ is comparable with same tire, and b) the 24.25mm wide TC is about 2.5 watts slower than the Turbo 22mm, tracking with my SWAG ROT that 1mm = 1 aero watt in tire width. Also confirms what we already know about vulcanized vs. open tubular tire designs at wide yaw angles.
2) OTOH here you have data showing the TC 24mm is equal to another tire, the so-called aero gold standard GP4000s 23mm at zero yaw. Also interesting is that the Turbo 24mm is slightly faster, leading me to believe that the Turbo series of tires have some magic aero properties that their Turbo Cotton "open tubular", a known poor performing design with regard to aero, does not have.
That said, the tire is a system, with both aero and Crr (and watts to spin, another story). This chart shows how good the Turbo Cotton 24mm tire really is with Crr data overlaid. The 24mm Turbo Cotton loses a watt or two from aero penalties, but gains 5 watts back at 40kph and 7 watts back at 50kph.
4) finally we have a chart depicting aero, Crr, and weighted yaw angles based on Mavic testing showing that at pretty much all speeds, the Turbo Cotton 24mm is fastest as compared to the "gold standard" GP4000s 23mm.
All this, combined with the knowledge that GP4000s 23mm = Turbo 24mm < Turbo 22mm in aero (first + second charts) and likely same in Crr (Tom A.'s Crr charts), leads me to believe that there's never really a good reason to run the GP4000s 23mm anymore. Same conclusion when you process Zipp's data that 22mm Attack > 23mm GP4000s > 25mm GP4000s in aero, and also Tom A.'s data that shows the GP SS 23mm is not too bad aero wise and VERY fast Crr wise.
Orbilius wrote:
I am very eager to see rolling resistance + aero test on this tire, but suspect it won't come out ahead. The 22mm SWorks turbo looks good though. Where have you seen aero tests of the turbo cottons? I would love to check that out.
Eric Reid AeroFit | Instagram Portfolio
Aerodynamic Retul Bike Fitting
“You are experiencing the criminal coverup of a foreign backed fascist hostile takeover of a mafia shakedown of an authoritarian religious slow motion coup. Persuade people to vote for Democracy.”
Last edited by:
ericM40-44: Feb 10, 16 7:57