progressive suspension rate fork spring kit triumph t100 t120 16 21 speed twin 19 21 street scrambler twin 16 21 thruxton 16 18 BS90 Consistently constant and correct flasher 15OM

progressive suspension rate fork spring kit triumph t100 t120 16 21 speed twin 19 21 street scrambler twin 16 21 thruxton 16 18 BS90 Consistently constant and correct flasher 15OM Consistently constant and correct flasher frequency and suited for almost all LED turn signal lights charge time according to result Progressive Rate Fork Springs have a clear advantage over straight rate springs because Progressive Rate Springs are designed to have a rising rate of resistance to compression The benefit of this is that the spring can be soft enough at the start of the travel to offer a "plush" ride and be firm enough at the end of the travel to soak up the big bumps