Teeth: 18 Bore: 5/8” OD: 3.72 Idler Sprockets: 40 & 41 Chain Size Our eBay Store About Us Contact Us Add to Favorite Sellers Stamped Idler Sprocket 18 Teeth w/ 5/8″ Bore For 40 & 41 Chain USA 35.95 Teeth: 18 Bore: 5/8” OD: 3.72 Idler Sprockets: 40 & 41 Chain Size