Bicycle chain tensioner
thingiverse
A simple chain tensioner that uses the bosses in the frame for spring tension. Will need a 2 m5 bolts, length will vary with frame/chain line, 3 m5 nuts, a pivot bolt with a 5mm shoulder and a salvaged spring from a rear derailleur. tolerances could be better on the pivot hole but this iteration is working for me at the moment Updated for tighter hole around pivot bolt. Have not tested though
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