SRAM rival

[speeddemon]

Hi all I’m building my own bike and I’m fitting sram rival 10 speed . What cassette should I use . It’s a road bike

 

[Jenkins]

Is the rear derailleur short cage or medium cage? With the short cage you can fit any 10 speed SRAM/Shimano compatible cassette with a largest cog of 28 teeth (such as a 11-28) while with the medium cage you can go up to 32 teeth on the largest cog.