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Bore Adapters

(19 products)

Our bore adapters can be purchased individually or as a set with an idler pulley. Reducers for 17mm and 5/8" bearings, down to 5/8", 1/2", and 3/8" are available.

Sleeve bushings will sit flush with the edge of your bearing, whereas shoulder and symmetrical bushings are designed to project out from the center.

Ensure proper fits for your bore adapter on the page with the idler pulley you intend to purchase. Choose from the drop-down menu. We have calculated how far the bore adapter selected will stick out from the outside edge of your pulley so you know if you've made the best choice. We install bore adapters at no additional charge.