Ritchey P29 rear brake question

[flash]

I'm building up a P29 frame. On a sliding dropout frame, can I fit an IS mount calliper? If so what size (without an adaptor) rear disc rotor should fit??? 160 seems too big, 140 too small……

 

[mforrest]

I had an 160 AVID on mine perfect fit.

Martin

 

[flash]

Cheers, an adaptor cured the problem. I'm not a natural disc brake user so get confused easily.....