Interesting, the whole chart does seem high.

Does zipp have a new slowtwitch liason?

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter

I hope so! Though I am happy to see you took a look! Pretty psyched for the first TT of the season tomorrow.

I'm racing this tire on Saturday. Same question - any views on if the chart makes sense as everything I read here says the tire pressure should be much lower than Zipp states but you would think they would know a thing or 2 about a top end race tire if they are the makers. Any views?

The chart on Zipp's website maxes out at 125 psi. Are we looking at something different?

Odd that they don't spec a different pressure for the two different sizes.

Given that I generally race on roads that aren't smooth, at 160 lbs my usual pressure of a bit over 100 actually jives reasonably well with their recommendation. I'm running a speed 23 in front and 25 in back, they're very fast tires as verified on the rollers with my PM.

The chart was for the SLSpeed Tubular. FWIW, I love these tubulars! I just ended up running 120 psi for the front and 125 psi for the rear (for the 24mm version).
http://www.zipp.com/.../detail.php?ID=30017

SLSpeed Tubular Tire Pressure Optimization
Tubular
320tpi / cottonDry
Rider Weight Front psi (bar)Rear psi (bar) <121 lbs
(<55 kg) 115 (7.9) 120 (8.3) 121-143 lbs
(55-65 kg) 120 (8.3) 125 (8.6) 143-165 lbs
(65-75 kg) 125 (8.6) 130 (9) 165-187 lbs
(75-85 kg) 130 (9) 135 (9.3) 187-209 lbs
(85-95 kg) 135 (9.3) 140 (9.7) >209 lbs
(>95 kg) 140 (9.7) 145 (10)

Triathlon/TT Use Rear Pressure Rain Minus 5 (0.34) - 10 (0.68) Rough Roads
Minus 10 (0.68) - 15 (1.03)