john.mitchell wrote:Paul, are you sure that the outers are the same. I think I wrote it up in Cheval but when I had Rigid 350 trials bike I used a drive sprocket set up from a twin because I didn't have a small enough single sprocket. It was fine for years and then I smashed the outer chaincase and when I tried to put on a spare it would not fit over the larger shock absorber and sprocket. I eventually found one which fitted and strangely it did not have different casting no. It seemed though that the bulge at the front was slightly larger on the one which fitted.
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