Our Cross Clamps mount to your seat tube to make your top-routed cables compatible with bottom-pull road derailleurs. Whaa? Well, you wanna race 'cross, right? But 'cross frames have top-routed cables, requiring a top-pull front derailleur. All the good, light components tend to be coopted from road groups, which have bottom-pull-only derailleurs. Lots of 'cross frames have a mount for a pully already integrated—the Cross Clamp allows you to do this with any frame. Get it?