I purchased a 25mm for the front tire for aerodynamics according to tour de france pros :P but quickly realized they are just too close to my fork. When it picks up a pebble or something, the fork catches it.

If anyone has 1 GP4000s II 23mm (like new) that wants to trade or wants to buy this used tire, <25miles, let me know. Asking for $40 + shipping.

Thanks!