Tire aspect ratio and handling

[jknappsax]

I'm posting this in projects vs. Tires and suspension because it has to do with aspect ratio and handling in a GSXR wheel and suspension swap. Going from 19/19" to 17/17" obviously lowers the bike. If I went with higher aspect-ratio tires would help make up some height difference, but would there be any downside in terms of handling? I would think that going to the 17" front would quicken the steering, but would the increased mass of a 90-series tire cause handling problems? Any thoughts and theories would be appreciated.

[Steve]

Not really understanding your terminology (19/19" and 17/17"), but there is no way that you are going to increase the overall diameter of a tire enough to compensate for the difference by going to a taller aspect ratio.

What are the specific sizes of your 17" tires? I have a calculator that will show the overall diameter and will run the sizes through to show your differences.

.

[jknappsax]

My Shorthand

... was a little confusing, and I mistyped. The 19/18" meant 19" front/rear to 17/17" 17" front and rear. since going from 19" to 17" diameter should drop the front end by 1" in the radius of tire surface to axle, I figured that making up any difference would be helpful in terms of not touching the 4-1 collector down over bumps. Just thinking about what tradeoffs the higher-aspect ratio might entail.

[posplayr]

I have a spreadsheet that calculates under belly clearance for various conversion combinations. Pm me your email if you want a copy. You can see that there are different results based those different combinations.