The all new Grand Prix 4000 Tubular may be missing the aura of the old champion, but the new challenger is enticing professional cyclists with its new technology.
A seamless casing design improves rim seating, uniformity and rolling resistance. The name, the dynamic tread design of the Grand Prix 4000, Black Chili tread compound and of course a Vectran puncture protection breaker state the high ambitions of this new tyre. What will you fit to your carbon road wheels?
Rated 1 out of 5 by Belisarius RUBBER DONE AT 1700 KM MARC
I did 1700 kms in 6 weeks with these tires. The rear, that took the most weight (160 lbs) averaged 15-120 psi. It shredded out of nowhere. I did not break a lot - certainly less than my 4000s clinchers that lasted me 4000-5000 kms per set. Had not enough distance time or opportunity to have a serious braking effort.
I dissected it and discovered it was down to the velcran tape on a quarter of the tire.
28 August 2013
Rated 5 out of 5 by Anonymous GP 4000 Tubby
Just like the clincher version, although now on my third tyre, with 2 bad cuts, perhaps just Life, but concerned at the ease with which the tyre seems to be cut? I will give it another go.
I carry "slime" or "liquid patch" works well and much cheaper than Pit stop
30 March 2013
Rated 5 out of 5 by Anonymous Brilliant
This is a wonderful tyre, worthy of a revival in tubular tyres. It's fast and grippy like the clincher version with second-to-none puncture protection. I was nervous at first as the tube itself is completely enclosed. There is no seam or sew-up, the outer skin is overlapped and vulcanised so if it punctures, it's a throw-away. The tradeoff is that it seats beautifully on the rim bed, is easier and safer to fit and is lighter. Rolling resistence is minimum, it really is a lovely tyre to ride, just make sure you have plenty of Pit-Stop if you're nervous about putting a hole in one.
29 January 2010