Weight Weenies

for those who don't yet know them, we have 3 main sources for tire performance
- Aerocoach who also regularly test their aero: https://www.aero-coach.co.uk/time-trial ... tance-data
- BRR with the known limitation of not really measuring vibration losses (so always show higher pressure = lower RR): https://www.bicyclerollingresistance.com/
- Cycle et Forme who built a protocol that is nicely calibrated to the two others https://www.cyclesetforme.fr/
- Wheel Energy is used by some manufacturers, and do include the impedance losses but they don't share data themselves https://wheelenergy.com/bicycles/

Aerocoach recently released a test on the not so popular anymore tubulars, really track oriented, but interesting to see how fast latest tubularsare compared to the TT only TLR... and they are fast. Not all are usable on the road but the Veloflex Record is usable as a race-day only (similar to a Corsa Speed that is even lighter 225/205g).
https://www.aero-coach.co.uk/tubular-tr ... resistance

Long story short, @iso pressure they are faster than the VeloFlex Record Clincher and would be <20w of RR

Thanks for the post, I realised it's taken a while to get the data published and people have been waiting a while! Apologies about that.

We haven't published the 90psi track tubular data as a graph (the track data above is all 150psi), but some relevant values for comparison at 90psi/45kph are:

Vittoria Pista Oro 23mm 0.001869 / 19.5w
Vittoria Pista Speed 23mm 0.001881 / 19.6w
Veloflex Record 23mm 0.002495 / 26.0w
Continental Sonderklasse 0.003209 / 33.4w

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Thanks Xav,
Interesting work as usual
Curious (and a bit disapointing) to see the VeloFlex in 23 degrades twice more than the vittoria at "road pressures". By any chance would you have the VF Record 25mm @90psi?

C36 wrote: ↑

Mon May 22, 2023 4:04 pm

Thanks Xav,
Interesting work as usual
Curious (and a bit disapointing) to see the VeloFlex in 23 degrades twice more than the vittoria at "road pressures". By any chance would you have the VF Record 25mm @90psi?

At higher pressures everything gets a bit closer, yeah. I don't have the 25mm Record 90psi data yet I'm afraid but will be part of an upcoming batch, as well as Corsa Speeds at track/road pressures and also the main road tubular data later. The 25mm Records are absolutely massive when inflated BTW (26.8mm), I think they'd make a very comfortable/fast/nice road tyre but wouldn't be practical as a front tyre on a track wheel that you want to be aerodynamic.

Thanks for that. Really interested to see an unbiased comparison between tubulars and tubeless tires

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