e46 M3 Tire Sizing Thread

[RedM3/4]

In this thread looking for something else, but my experience is you need to keep variance really close if the rears are smaller than fronts; rears being BIGGER diameter/circumference than fronts isn't an issue within reason. I believe I've run 1/2" larger in rear with zero dsc issues. My belief is the dsc thinks rears are spinning under accel if the rears are turning much faster than the fronts, so with larger rears, this comparison is never going to trip unless real spinning occurs. There could also be some sort of "out of range" comparison too that would be an issue if rears were abnormally larger, not sure.

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[Tbonem3]

No that's E9x tire spec. Go with 245 & 275 or 235 & 265.

Also, .5" diameter is large. Look at rolling circumferences in the first post.

[crbws6]

Looking at:

245/35/19 (25.8" dia) Front
265/30/19 (25.3" dia) Rear

0.5" diameter delta (2%)

Will this be OK for street use with respect to DSC?

[K-Dawg]

Good morning all…so it seems Michelin Pilot 4S is not offered in 275/30/19 or 285/30/19. The local vendors seem to only be able to get 275/35 or 285/35. If I read correctly, the difference is that the 35 will stand a bit taller, right? Again, my fronts are new and 245/35. Thoughts?

Tirerack has 275 in stock and 285 in stock in less than two weeks.

[Rkymtnrider]

Good morning all…so it seems Michelin Pilot 4S is not offered in 275/30/19 or 285/30/19. The local vendors seem to only be able to get 275/35 or 285/35. If I read correctly, the difference is that the 35 will stand a bit taller, right? Again, my fronts are new and 245/35. Thoughts?

here ya go. A 245/40 and 275/35 have an almost identical diameter. A 245/35 is almost an inch shorter than a 275/35. If you look at the revolutions though, the difference is huge

[Cb3319]

Good morning all…so it seems Michelin Pilot 4S is not offered in 275/30/19 or 285/30/19. The local vendors seem to only be able to get 275/35 or 285/35. If I read correctly, the difference is that the 35 will stand a bit taller, right? Again, my fronts are new and 245/35. Thoughts?

[twastheglow]

I just fitted 235/40/19 front and 265/35/19 rear PS 4s to both maintain rolling circumference front to rear as well as to try to dial back the natural speedometer error.

[K-Dawg]

Has anyone run 255/40/18 square on a 9.5" wheel? Tyre shortage forcing me to move away from the 265/35/18 I had ordered.

It's a stock size, so it seems perfect to me.

Hey Guys…back from a a several month hiatus. This was a tire size discussion that several of you helped with. To update, bought the 02 silver titanium convertible in late September. No mods other than the wheels. SSR GT3s. I have replaced the fronts with 245/35/19 Pilot 4S. The rears are ready and currently have 285/35/19 Pilot SS. I have had NO rubbing front or back but I do not track the car and have yet to run it very hard. The question: if I replace the rears with 275s will there be a dramatic difference? Yall have asked how wide are the rears? 10.5(measured with the tire on the wheel).

275/30/19 would be the most popular rear size. 285/30/19 would work as well but harder to find.

[oceansize]

Hey Guys…back from a a several month hiatus. This was a tire size discussion that several of you helped with. To update, bought the 02 silver titanium convertible in late September. No mods other than the wheels. SSR GT3s. I have replaced the fronts with 245/35/19 Pilot 4S. The rears are ready and currently have 285/35/19 Pilot SS. I have had NO rubbing front or back but I do not track the car and have yet to run it very hard. The question: if I replace the rears with 275s will there be a dramatic difference? Yall have asked how wide are the rears? 10.5(measured with the tire on the wheel).

This will answer your questions exactly as you can enter your current tire/rim setup and your new tire/rim setup and then see precisely what the differences will be with respect to circumference, ride height, offset, etc.

https://www.willtheyfit.com/

[Cb3319]

Hey Guys…back from a a several month hiatus. This was a tire size discussion that several of you helped with. To update, bought the 02 silver titanium convertible in late September. No mods other than the wheels. SSR GT3s. I have replaced the fronts with 245/35/19 Pilot 4S. The rears are ready and currently have 285/35/19 Pilot SS. I have had NO rubbing front or back but I do not track the car and have yet to run it very hard. The question: if I replace the rears with 275s will there be a dramatic difference? Yall have asked how wide are the rears? 10.5(measured with the tire on the wheel).

[Drewrivera]

Can we see. 😬?!

[01SG]

I'm running 255/40/17 on a 9.5". I have no complaints. Not sure what problem could possibly arise on the street, there's no downside. My car only sees a few track events each year, so having the most absolute grip was not a concern nor a cost I felt compelled to endure.

I was happy with the 235 squared that came from the factory on the 95 M3. I tried to emulate that setup.

[Thoglan]

Has anyone run 255/40/18 square on a 9.5" wheel? Tyre shortage forcing me to move away from the 265/35/18 I had ordered.

[liam821]

This may have been asked already, but has anyone run 285/35-18 on a 18x10 et25 rear wheel? With stock alignment and minimal lowering will it fit?

I'd get a second opinion, but it should fit.

[cobra]

This may have been asked already, but has anyone run 285/35-18 on a 18x10 et25 rear wheel? With stock alignment and minimal lowering will it fit?