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Despite their unconventional shape
tough metal core
abrasion resistant
If you need more length on the arm
Schlumpf Steel Cone .5mm For Aluminum Frame apparel Despite their unconventional shapeThe Schlumpf Steel Cone Ring for Schlumpf Drive Units is for use on aluminum frames and prevents the Schlumpf drive from slipping in the bottom bracket. One ring is needed between the frame and drive unit except on Mountain Drive units with a torque arm. Using a steel cone ring on aluminum frame material gives you better friction and less chance of the gear unit slipping in the frame. For Schlumpf Drive installation documents, manuals and additional
