I've got a 14-38t Suntour freewheel that I recently rebuilt to 6 speed "Ultra" spacing, thus compatible with 8 speed chains.
Haven't made up my mind how to build it up. One notion is a trials-type MTB with 24" rear wheel and Rotor Cranks. Or on a Trek 520 touring frame. With Suntour Command shifters. Or with SRAM Double-Tap used as ratchet shifters by tricking the cable at the rear-deraileur.
Normally a Suntour Mountech, Alpine Gear or Huret Duo-Par is needed for Campy dropouts. (Or if you have Simplex drops then a rear derailleur that can do 34t is said to work.) However I'm thinking that the new Shimano and SRAM derailleurs that are made to work with 36t cassettes should be capable of running the Suntour 38t.
Also thinking of converting a few more 38-tees to Ultra and flipping them on-line, since it appears none were ever made stock with Ultra spacing.
Last edited by Drakonchik; 06-16-10 at 05:02 PM.