1st Gear Set. Fits 4Spd Big Twin 1959-1986. 2.60 Ratio.

* 16T x 20T mainshaft 1st gear cluster with a 24T countershaft 1st gear.

* Installation in ’80-86 4spBT requires purchase of a 21 tooth countershaft(1.82 ratio) 2nd gear AP-202160.

* 2.60 Ratio works best with Electra glides and heavier bikes