Quote:
Originally Posted by dorifto88
can you elaborate on how a 245 will cause tire shimmy?
|
You're fitting too much tire on a limited width wheel.
Can you fit 245s on the wheel? Of course. Is it beneficial? Nope.
There comes the law of diminishing returns when it comes to tire size on a confined wheel width. 245 is that limit.
When you get a tire on a wheel that much, the tire actually moves back and forth on the wheel before the sidewall deflects and you get your grip.
From the time the tire moves, to when the sidewall actually deflects takes away response and actual corner grip from the wheel.
This is why you don't see many people squeezing street tires as big as they can onto a wheel when it comes to competition. They can probably go +20mm bigger, but it isn't ideal. For example, on a 9.5" wheel I'd go 265mm. Even though you could go up to 285mm most likely, stretching the sidewall a bit to make it stiffer increases response and feel through the wheel.
Now, when you get to R-Comps...this is a different story.
And when you're really pushing the tire, this is what deflection looks like:
