Suspension question

OK, so I changed from 190/55's to 190/50's in the rear (09 R1). On this forum or somewhere else, when asking the question about changing rear tire sizes, they said to measure the distance from mid axle to the ground (55 tire) with the bike level - then measure the same with the 50 tire on. Then the difference is how much you raise the forks to compensate to keep the geometry the same. This is what I did and took it for a 40 mile spin (with twisties) - feels good, no problems that I could feel. Was this the right thing to do?

That is what I did too. The 50 profile tyre dropped my axle 8mm and I raised my forks 9mm. Feels great. And before someone starts, my 190/50 Pilot Power tips in much easier than the POS 190/55 Dunlop.

You are just going to loose a little bit of ground clearance.

You are just going to loose a little bit of ground clearance. And trail :fact Not a bad thing necessarily. I think the 09 can do well with a few mm less trail. Just my opinion. Have not yet had the chance to push any extremes.

I dropped the front by 3mm to get a bit more feedback while I'm deciding when to do the re-valve. no adverse effect in terms of front wanting to tuck-in when the front is sliding. And trail :fact Not a bad thing necessarily. I think the 09 can do well with a few mm less trail. Just my opinion. Have not yet had the chance to push any extremes.

I dropped the front by 3mm to get a bit more feedback while I'm deciding when to do the re-valve. no adverse effect in terms of front wanting to tuck-in when the front is sliding. Depending on the rider sag I think that's a pretty solid number.

Been fooling with my stock suspension on my '09 and have it almost perfect but still get a little rear end "bucking" on sharp positive bumps (as opposed to negative/potholes). The sag is 33 mm front and back, the rebound and compression on the front feel perfect as the front end tracks well and is not upset on bumpy corners at turn in or under hard braking. I think the rebound on the back is good but I'm still getting this firm response to larger bumps at the back even though I've gone 4 turns out on fast comp and 14 clicks out on slow comp.

Been fooling with my stock suspension on my '09 and have it almost perfect but still get a little rear end "bucking" on sharp positive bumps (as opposed to negative/potholes). The sag is 33 mm front and back, the rebound and compression on the front feel perfect as the front end tracks well and is not upset on bumpy corners at turn in or under hard braking. I think the rebound on the back is good but I'm still getting this firm response to larger bumps at the back even though I've gone 4 turns out on fast comp and 14 clicks out on slow comp. Are you riding street or track? Numbers would seem to indicate track. Generally you want the rear to be 5-10mm less rider sag then the front. I'd suggest adjusting the sag either front or back to better balance the bike. Both Ohlins and Traxxion told me to aim for 35-40mm front. Then, if the rear is bucking up to fast, increase your rebound in 4 click increments and decrease your high speed compression as well.