Originally Posted by
topflightpro
GP4000s will be fine. I've run Conti Supersonic and Schwalbe One clinchers, and Conti Sprinters and GP4000 tubulars. They work as they should.
Thank you!
One more even noobier question--are cog sizes standard, or should I have my LBS check out the hubs (Phil Wood track hubs of some vintage) to see what will fit? I need to put a 15t on the back (it currently has an 18t/16t combo), since Cat5/4s all run 48/15 on my track.