The spring rates from Progessive tech support:
08 Triumph America 412 11.5" length
125/170
* had to use 412 as they don't offer the 430 remember should be the same though, right???
07 up HD sportsters 430 11.5" length
90/130 Standard duty
115/155 Heavy duty
Current Dyna 430 11.5"
270/300 Standard duty
So as of only armed with this information I am leaning with the HD coils and adjust them up to get the best chance at 2 up?
I have to hold out faith that someone at sometime has swapped out shocks that weren't the original equipment or specificaly manufactured for the speedmaster or america over the years and had success, right?
Last edited by MD_America; 05/04/2010 11:41 AM.