chorus88 wrote:At 110 psi, I love my GP4000s II 25s, especially w/ Zonda C17s.
So far, only one rear flat, caused by a nail while riding thru a construction site.
Wow, how much do you weigh? That sounds like pretty high pressure to be running on a C17 rim, no?
For comparison, I run my Conti 25s at 80 to 85 psi on my Fulcrum Racing Zero C17s and I'm about 70k. I guess this sounds low to you, so how would one go about determining the ideal pressure. I also ride on a mix of smooth and shite roads.
On my previous wheelset, Ultegra 6800s (not wide), I ran them at about 95 to 100 psi.
By the way, as far as the tires go, I've had great success with the Contis. Durable, great grip, smooth rolling, and quite affordable as you can usually get them on sale at Wiggle or ProBikeKit, for example.
Also, given how popular these tires are, I would expect to see even more people on here voicing issues with them if they were really some sort of systemic quality issues. However, I would guess the actual percentage of tires that make it out of the factory, which don't meet Continental's quality standards, is far below 1%.
Don't think I'll be switching tires anytime soon.