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Challenge Grifo Tubular Tire for Cyclocross
The Challenge Grifo tubular tire is a premium hand-made tubular cyclocross racing tire. I tested both the 34C and 32C versions.
I had three immediate tire semi-failures on the front wheel (defective or badly made tires).
Yet a 700 X 32C size worked great (no bulge problems after ~300 miles) and I have gotten a lot of miles on it. Grip with the 32C version is excellent.
See Challenge Grifo 32 tubular tire pricing at Amazon.
Oddly, the picture on the Challenge site shows 300 TPI, but the tires I bought are actually 260 TPI, which is also what the specifications say.
Use: Cyclocross Size: 28" Width: 32mm Weight: 415 gr (nominal) TPI: 260 BAR: 2-6 PSI: 28-87 Bead Casing: Super Poly Color: Black-Brown
The bike industry cheats on weight. Challenge is no exception, but the weights are quite close, far better than the 10% or more one might find with Veloflex.
I weighed two tires as follows:
423g = +1.9%
427g = +2.8%
FAST USB 3.1 gen 1 interface +
eSATA + RAID stripe or mirror or independent drives.
Excellent on the Moots Psychlo X RSL.