S&S/Gates High Strength Final Drive Belt, 14mm 139 Tooth - 1-1/2 S&amp;S has teamed up with Gates, a leading manufacturer of power transmission belts, to offer a series of secondary drive belts These belts feature Gates super strong X3N carbon cord material which is significantly stronger than the Aramid material used in many O.E.M. final drive belts Available with 14mm pitch in 1-1/2 and 1-1/8 widths