Having 2 Nice sets of st4s wheels sitting, I spend some hours in the garage today to figure out the details to get them fitted.. rear end is the troublesome one as mentioned in earlier threads ..in case some one else have similar plans here a few tips
1) get Sprocket carrier from ie monster 620.. 13 mm wheel to sprocket . See foto
2) source dual track bearing 55/30/19, as replacement for dual bearings 2x 55/30/12
3) Take off 6,5 mm and make new grove for segerring.
4) make new bushings depending on your rear axel size.. I have 25mm on this bike, but bushing can be made for 17mm no prob.


