sirbunz

14" ish IIRC... I don't trust the fender to hub center measurements. I have seen different measurements to the frame-ground vs. fender to hub center. I will get specifics when I get home and pull them off my notes, but used them as an example here to point out that you don't "have" to set your car low to get good handling. I tried my CR anywhere from 13" to 11" and had it aligned/corner balanced close to 10 different times over the course of 2 (1.5) seasons. Most remember the last two events where it was slammed, but forget that I started pretty high.

-Marc

IntegraR0064

I find fender to hub is much better if you use some calipers and measure top of rim to fender, which is very repeatable, then add half your wheel size to it to convert to fender to hub.

xraymd

Wet/rain event question: do people tend to run the same width tire as at dry events? Would a narrower section width do better in the rain?

IntegraR0064

Narrow would be better in the rain but it's hard to do good rain testing to get the optimum width unless you're tire rack...conditions change so much.

xraymd

That is true. I am planning to buy a set of tires to go on OEM wheels, and am planning on them being used for "real rain", as I suspect that in light rain or drying conditions the extreme performance tires will still be better. Comparing wet track data from TR test sessions is sort of problematic as the tires used in each session were different, tests performed on different days etc.

I suspect that wet rainy conditions would accentuate the car's inherent tendency to over/under steer, so I was thinking 225/235 as 235 may be too much tire for the front wheel? Currently the car is 255 square with fairly neutral handling and predictable on throttle oversteer.

RyanDavies

You need a pretty good amount of rain to outpace your dry setup with wets. Not quite hurricane-level, but definitely needs to be standing water. Even when we had RS3s. With that said, we've got a set of 235/45 Continental DW that work very, very well in the wet.

xraymd

Thanks, Ryan. Seeing as the 235/45 is 25.3" and the 245/40 is 24.7", Did you go with the higher aspect ratio 245/45 (25.7")?

RyanDavies

We went with the 235/45s. This was a scramble two days before the DC ProSolo when poor weather was forecast for the entire weekend.

I'd say if you're just competing locally, don't worry about a set of wets (unless you're using them as transit tires as well).

iamxpl

Im new to STR and i have searched but couldnt really find a good answer, so please dont flame me.

I have a set of CE28 17x8.5 +50 wheels that i wanted to use as a second set. I test fitted the 235/45 and they are coming pretty close and I can hear them rub my liner while driving on normal roads. i believe my height is 12.75" fender to hub ( i will check later today more accurately after i get a caliper measuring tool ) and the 245/40 does have the shorter sidewall profile. I will also be rolling my fenders this week to see if it will give me some more room.

Has anyone here ran the 245/40 square set up? on a 8.5 wheel? was it much slower than a 255/40 on a 9" wheel? Is it worth it at all to run the 8.5 or should I just sell them and get an extra set of 17x9?

TIA,

Hezron

Terrible01

I don't know how much or if the 245 square setup is slower than a 255 square setup. Maybe someone else knows that answer.

Rolling the fenders should do the trick if there is enough camber to help the 245's clear. Speaking of which, how much camber are you running?

But the best bet would be to run the same setup as the others, a 17x9 +60 with 255's and rolled fenders.