Hi all , trying to fit a drum front end on a new build, As far as I know the RD bottom tree is slightly wider than R5 (DS7). I'm pretty sure I have a top triple tree that is R5. Am I missing drum parts here ? Or my forks are bent ?, just a question to those who may have done this. I know the bottom tree is RD, but it lines up with the aforementioned R5 top tree.
R5, DS7, '73-'74 RD250 drum front end triple clamps are 10mm skinnier than RD350 disc triples.
No mix n match, both top and bottom needed to convert.
yep thought so, thanks for the reply cheers !
Also the fork tubes are different. The DS7/R5 tubes are tapered at the top and are held in place by the cap; there is no bolt going through the side of the clamp pinching the tube. Another difference is the steering damper; the RD has a small, hydraulic damper bolted to the damper of the bottom clamp and the DS7/R5 has a friction damper that is adjusted by a long rod/screw turned by a knob located on the top clamp.
Lyn Garland
Thanks Lyn, turned out the issue I've been sweating over was due to original forks being bent and twisted, HVC cycle sell new ones, so I'll be getting a pair from them soon.