I have to say the only thing that will be important in figuring out overall diameter is how it'll affect ABS. That will be something that even the regular JOE that drives his car on the street will notice. Otherwise, I think it's hard pressed to compare a 2 wheel motorcycle to a complex 4 wheel car in terms of suspension geometry.

 

Trust me guys, for the naysayers, after 23 sportscars, I know what I'm doing with tire/wheel
changes. I wouldn't recommend my set-up for the average Joe, but out of those 23 sportscars, maybe three were front wheel
drive. The car is dropped 1.25-inches, has the alignment set-up properly within specs
to accept the change in diameter and I don't want to go into a discertation on ABS and
how it works but the ABS is not compromised by the change. All four tires are the same diameter.
I've been running this type of set-up for nearly two years now with no adverse handling
effects at all.
I find it sort of ironic that someone who continues to sell products that deviate
from Honda's original vision would write, "FYI, the goal with new tires and wheels is to always get as close as possilbe to the same wheel/tire diameter and rolling cirumference as stock" without acknowledging that when performing modifications for better performance/handling, there is no one "goal" which can be applied to all
situations. A 19-inch tire/wheel set-up can be close to stock height but is that
going to IMPROVE handling or make it worse? When dealing with tire/wheel combos, there is much more to consider than simply matching diameters as I'm
sure Rick would now agree. There are definitive performance advantages by lowering the diameter of your tires. My speedo error is 2.2%, so when the gauge reads 72, I'm doing 70mph. I don't consider that a disadvantage, especially since my gears have been manipulated for "free" up to around 4.30
Once again, with regards to the ABS, the car's braking ability has improved due to less rotational weight but ABS has not been effected one iota. The car's ABS
sensors work as well as it did when stock (I've tested the system many times over
following my various tire/wheel combinations). My first tire/wheel combo had
the rear tire ..7 inches taller than the fronts and the ABS was not effected. It
continued to work as advertised however .7 inches variation in front/wheel tire
is pushing the margin of acceptability.

 

Rick is there any word on the new backlash specs yet....firestryke and I have an apointment to have our gears installed tommorow and were affraid the nessesary specs will not be ready in time........any help in this matter would be greatly appreciated......