adjusting ride height for Pilot Powers & 750 GSXR Shock

[suparobb]

im plannning on putting a new set of tires on my B4 since i hit the tread life indicator on my rear tire. i also wanted to upgrade the shock to a 90-95 GSXR 750 shock too. to improve handling.

the problem is that i wanna keep the ride height at oem specifications.

i want to put pilot powers in a 110/70 and a 150/60 or even a 160/60 if you think that will give a better ride since you have more of a contact patch.

do you think the gsxr shock will add a 10mm to the ride height to compensate the smaller profile of 150/60 pilot power compared to a 150/70 stock tire size? if not is there a way to compensate the ride height with a smaller profile tire?

any help or advice would be greatly appreciated, thanks!

-robert

[gsxr400 racer]

get some sewing tape measure the circumfrence of the dstock tire on it put the new one on measure circumfrence again add that much ride height!   Unless your a racer this is just masterbation! but to each his own! run a 150 ride more worry less!

[Racerruss-ducati]

What Rob said!!!

The 150/70 rear tire should have a sidewall height of 0.7*150=105mm.  The 150/60 will have a sidewall height of 90mm.  When I put an '01 GSXR shock on my B4 it raised the rear end by about 30 mm.  I think the 150/60 rear tire will be an almost perfect offset for the shock change.  I had to change my dog bones to get the attitude to where I wanted it.  Let us know how it works out.

BTW, if you buy an older GSXR shock, be sure and check the nitrogen pressure, there was a posting recently about how bad the shock is (doesn't work at all as reported) if the pressure is too low.

[PitterB4]

What Rob said!!!

I'm Rob - he's Jay.  I'm the hansome one, he's the one who knows what the hell he's talking about.  

Seriously... I have a Bandit 1200 shock on mine which definitely raised the tail (DAMN I wish I had remembered to take a before measurement.).  I went to a 60-series tire to negate a little of that rise and b/c you have better tire options in that size.  As I've posted here before, I'm thrilled with the results.  I think it handles amazingly.

[tomacGTi]

I have the said formerly verklempt GSXR rear shock on my bike: No change in ride height.

I am contemplating Pilot Powers in 160/60 and 110/70 however considering my present tires are pretty poo-poo.

Rob, we'll have to ride when I get back now that the shock is right. Just have to make sure I have whatever damage handled on it before though (even longer story now...)!

-Randy

[PitterB4]

Randy - you definitely need some new hoops!  IIRC, you have a 150/60 on now.  That 160/60 should raise the tail ~9mm - maybe a little more since you're putting it on a narrow rim.  

I'm always up for a ride - even when my bike isn't!     Lemme know (pm me here) when you want to go.  Maybe we could even drag Cdyer out so you can hear that Super Chicken rumble.

[tomacGTi]

Sounds fine Rob.

I've bounced around the idea of tire sizes but may settle on the 150/60. Regardless, it'll have to wait for funds, the crash BS and when I get back home from the west coast.

Incidentally, the west coast does have us on twisty roads as opposed to us back home. We're in Napa for a couple of days for a race and the surface roads in the mountains are kind of ridiculous. Talk about knee draggin city!

If California has a saving grace, it was their road engineers were high/drunk when they laid the pavement down (in certain spots, we won't talk about the fwys). The rest of the state can eat my ass.

-Randy