Good chance a suspension specialist will be able to adjust the stroke , revalve and respring to suit your the trx ratios and your weight.
You think it's good now mate, you'll love just how fine you can tune the suspension.
Relay arm and swing arm length all come into play with progressive ratios and damping / spring rates.
Even if your mate on the gsxr is the same weight as you and had the shock built to his weight, you will find the spring rate will be too soft. It will be even softer once the stroke is reduced by 12mm.
I looked at the Penske shocks for a mates 900 hornet I did some work too, but the Wilbers ($1050)had the same options for a little less price.
Same goes with the R6 shock, if you weigh 80-85kg if your on the R6 , the spring will be too soft due to the longer swing arm length and relay ratios.
But the shorter trx swing arm length and different ratios makes the spring rate stiffer for a TRX.
Lucky man Paul , great score, sell the R6 set up and it will cover the costs for the rebuild ( but you may onlyhave to pay for a spring)



