225/45/15 vs 255/40/17 RS for autox

[CrazyB]

I love my xxr 527's with 255's! For the price, you can't get a better deal!

How much clearancing did you have to do in the front to not rub on the turn in?
I am currently running into the issue of catching the edge of the valance on turn in.

[team9]

I love my xxr 527's with 255's! For the price, you can't get a better deal!

[Brian D]

the wheels are Rota grids, got them from wheeldude.com
They are about 19lb each so they are on the heavier side.

Y'know, 19 lbs for a 17x9 is really not bad at all. It looks badass, it will be interesting to see what you think of the combo after an event. How was wheeldude to deal with? Were the wheels special order?

[Chris916]

Yea im going with the 17x9.75's that are +25 offset. So im hoping they will work with my 15mm spacers. And yea, kind of a bummer that they are a 73.1 cb but i can run rings if i really feel the need.

[CrazyB]

Yeah i have been searching for a hwile.
Also what Offset are the 527s and the Rota comes in the correct hub size which is a big plus

[Chris916]

Thanks for the info. The 527's are 20lbs ea unfortunately. It's tough to find lightweight 17x9's in 4x100.

[CrazyB]

Yep

[Roysneon]

Are those DTM Fibrewerks flares?

[CrazyB]

the wheels are Rota grids, got them from wheeldude.com
They are about 19lb each so they are on the heavier side.

[Chris916]

Looks great! What wheels are those? And what is the weight of them? I just ordered a set of 255/40/17 rs3, and just about to order the xxr 527's to mount them on.

And yes the rear fenders are a real pain with the 2 layers to cut through.

Ask me how i know :P

[CrazyB]

A quick update, finally got the wheels fitted.
17x9 with et 20 running rs3 in 255/40/17 with 10mm spacers all around
Rears barely rub on the flares so have to grind the inner lip of the flares a little
fronts need a lot more work as the sheet metal under the bumper catches the tire barely on turn in. but looks like with a little TLC they should fit.




PS: rear fenders are a real pain to cut.

[BlackbirdM3]

Where I do most of my autoX, everyone has issues getting heat into the tires. It doesn't matter if you have a dune buggy or a Vette, they have issues with it.

For what its worth, I won my class yesterday and had the 2nd fastest BMW there, the guy who beat me was on R compounds with two drivers. I was on RS3s.

Will

[CrazyB]

Good point, however that was beacuse the Hoosier 275/15 wasn't available at the time, from what I remember he switched to the 15s when they became available.

No question, if I was building a DSP E30...or ANY sub-2500 lb street prepared car, I would be on the 15" A6s.

Also, getting heat into an A6 is a whole different animal that getting heat into RS3s. A6s work dead-cold & can easily OVER-heat...RS3s take some effort to get up to temp, & pretty much NEVER overheat.

This is a great point, but RS3 do overheat. Trust me if you have a warm day and 2 drivers in the car the things do start to melt.

[Nsquared97]

Alex Schipkov's DSP E30 car ran 18x11s with 285/30/18 A6s, so getting heat into a large tire is a non-issue.

Race2win beat me to it. Your comparing 2 completely different tire compounds, obviously an R-comp designed for autoX is going to heat up faster than a street tire.

[race2win]

Alex Schipkov's DSP E30 car ran 18x11s with 285/30/18 A6s, so getting heat into a large tire is a non-issue.

Good point, however that was beacuse the Hoosier 275/15 wasn't available at the time, from what I remember he switched to the 15s when they became available.

No question, if I was building a DSP E30...or ANY sub-2500 lb street prepared car, I would be on the 15" A6s.

Also, getting heat into an A6 is a whole different animal that getting heat into RS3s. A6s work dead-cold & can easily OVER-heat...RS3s take some effort to get up to temp, & pretty much NEVER overheat.