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Mechanik Pinhead Drive Stud
Mechanik Pinhead Drive Studs are perfect when using 22 or 23T sprockets, the diameter is so small that the chain has a tendency to ride on the head of the sprocket bolt. The Pinhead stud replaces the stock sprocket bolt to provide plenty of chain clearance. Don't be concerned that the stud doesn't tighten down against the sprocket itself. The sprocket is held in place at the spindle. All the bolt needs to do is transfer the pedal force from the arm to the chainwheel. Available to fit standard or metric threads.
Standard Thread: Fits Profile, Madera and Odyssey 41 Thermal. Metric Thread: Fits most other cranks.