Originally Posted by TCR Rider

While not exactly pertinent to the subject at hand I'm hoping to get some clarification on this. I've been riding Conti GP 4000s's (23) for a number of years and recently switched to the 25's. There was a sale on Pro Bike Fit and along with a nice price they were throwing in a free tube with each tire. Long story short the tubes included with the GP 4000s -25 were 700 x 18/23c. Are they compatible with the 25's? I had my doubts since the size is 700 x 18/23 not 18/25. Pardon the interruption.