There seems to be a requirement to mess about with the thickness of the STM clutch pack to keep it working correctly. I may be wrong, but that is what I got from it. Also read that on the Sigma site this morning where they describe slipper clutches. I am not sure I would want to be messing about with that at fairly frequent intervals - alright if you use a bike for track use/racing but if you ride on the road and take on holiday it could be an issue. Same with greasing the bearings on the ones that require that. |