Honda CT90 - posi-torque sub transmission
Honda invented the posi-torque system in 1967 and started to fit it to the CT90 range in the same year. This ingenious device had the effect of providing the bike with 4 additional hillclimbing gears in addition to the standard 4 ratios for road-riding
Earlier solutions
The posi-torque system replaced the unwieldy dual rear sprocket...
Honda invented the posi-torque system in 1967 and started to fit it to the CT90 range in the same year....