Click to expand Tap to zoom S&S, Nut. Pinion Shaft Gear for 54-89 Big Twin by S&S Save £-27.44 £27.44 | / SKU MCS531313 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart DescriptionS&S, nut. Pinion shaft gearDetails5/8-24 left hand threaded. Repl. 24023-54.54-89 B.T.