Tire sizes for new wheels

mike519 · 03-15-2013, 08:47 PM

OK, I am getting the EC7s from the GB soon and for now, I am going to put the stocks on them, pretty certain sizes are fine. I am picking up:

18x8.5et35 fronts - stock tires are 225/45
18x9.5et22 rears - stock tires are 255/40

As soon as I can afford them, possibly even at the same time if I can make it work, I am going to pick up PSSs. I know I can obviously pick up the same size tires in PSS but I am wondering if there is a benefit to a different size than stock.

Thoughts?

Mirko · 03-15-2013, 09:24 PM

When I spoke with Joe he said the largest I should go is 235 front and 265 rear for that rim size. I plan on going with that eventually as my current rubber wears out. Might be a while though. Otherwise sticking with stock sizes for now.

http://www.zpost.com/forums/showthread.php?t=815267

Quote:

Originally Posted by The HACK

You will gain far more in grip from a switch in brand/compound than you EVER WILL with wider tires. EVAH.

HAVING SAID THAT.

If you can manage to break the traction loose on the stock tires regularly enough on the street, you're basically a statistic waiting to happen, IMO. There's too many variables that's out of your control for any meaningful increase in performance to be gained.

Now, if you're telling me that you don't care about performance but are after the looks from the honeys because, you know, chicks dig FAT tires? I'd tell you to go ahead and run 245F/275R width tires because that 20mm width is visibly noticeable. Other than that, any upgrade in width compared to a compound upgrade is meaningless because the additional width will only buy you extra heat capacity, heat capacity in which you will NEVER be able to exceed on the street.

mike519 · 03-16-2013, 09:38 PM

So, assuming I go with 235 and 265, the next question of course is height of the tires.

For fronts, if I go with 235/40, looks like the overall diameter is .5inch less. 1010 tire calculator shows this as a 2.2% variance over stock (within their 3% recommendation). I also, therefore, assume this allows me more room for lowering...maybe even adding a spacer to push the et35 wheel out a little. 45s are bigger and will likely hurt when it comes to lowering.

For the rears, if I go with 265/35, diameter is .7inch less which equals a 2.8% variance. 40s would be .3inch (1.21%) bigger...not sure if this is as big a deal so I could go with either size here I think.

Thoughts?

Finnegan · 03-16-2013, 10:31 PM

235/40 and 265/35 will work, so will 245/40 and 275/35. Course you can go with stock sizes too. Benefit? Hack's post touches on this. The wider tires give the rims some protection, and IMO they look good! The red car in this thread has your rim size and 245/40 275/35 tires.

mike519 · 03-16-2013, 10:39 PM

Quote:

Originally Posted by Finnegan

235/40 and 265/35 will work, so will 245/40 and 275/35. Course you can go with stock sizes too. Benefit? Hack's post touches on this. The wider tires give the rims some protection, and IMO they look good! The red car in this thread has your rim size and 245/40 275/35 tires.

Thanks Finnegan, that does look good.

Finnegan · 03-16-2013, 11:14 PM

Cool. It's really a matter of how it looks as any of those sizes in PSS will be quite sticky.

Punko · 03-17-2013, 12:15 PM

I have 245/40 and 265/40 on OEM suspension and wheels.

These are OEM sizes for M3....lots of lightly used tires available.

antennahead · 03-17-2013, 12:50 PM

Quote:

Originally Posted by mike519

So, assuming I go with 235 and 265, the next question of course is height of the tires.

For fronts, if I go with 235/40, looks like the overall diameter is .5inch less. 1010 tire calculator shows this as a 2.2% variance over stock (within their 3% recommendation). I also, therefore, assume this allows me more room for lowering...maybe even adding a spacer to push the et35 wheel out a little. 45s are bigger and will likely hurt when it comes to lowering.

For the rears, if I go with 265/35, diameter is .7inch less which equals a 2.8% variance. 40s would be .3inch (1.21%) bigger...not sure if this is as big a deal so I could go with either size here I think.

Thoughts?

I have 18x8.5et35 fronts/18x9.5et22 rears, M359s with 235/40 & 265/35 PSS, no issues whatsoever. Great combination, perfect tire size for the rim width.

John

mike519 · 03-17-2013, 01:00 PM

Quote:

Originally Posted by antennahead

Quote:

Originally Posted by mike519

So, assuming I go with 235 and 265, the next question of course is height of the tires.

For fronts, if I go with 235/40, looks like the overall diameter is .5inch less. 1010 tire calculator shows this as a 2.2% variance over stock (within their 3% recommendation). I also, therefore, assume this allows me more room for lowering...maybe even adding a spacer to push the et35 wheel out a little. 45s are bigger and will likely hurt when it comes to lowering.

For the rears, if I go with 265/35, diameter is .7inch less which equals a 2.8% variance. 40s would be .3inch (1.21%) bigger...not sure if this is as big a deal so I could go with either size here I think.

Thoughts?

I have 18x8.5et35 fronts/18x9.5et22 rears, M359s with 235/40 & 265/35 PSS, no issues whatsoever. Great combination, perfect tire size for the rim width.

John

Thanks John. Have you done any lowering or spacers (or both!)? Just wondering about clearances to do so.

Thx

antennahead · 03-17-2013, 04:36 PM

Quote:

Originally Posted by mike519

Thanks John. Have you done any lowering or spacers (or both!)? Just wondering about clearances to do so.

Thx

No spacers, I have the Eibach Pro Kit springs on the car, no rubbing at all.

mike519 · 03-17-2013, 04:58 PM

Perfect, thanks!

inTgr8r · 03-17-2013, 05:07 PM

Quote:

Originally Posted by antennahead

I have 18x8.5et35 fronts/18x9.5et22 rears, M359s with 235/40 & 265/35 PSS, no issues whatsoever. Great combination, perfect tire size for the rim width.

John

Same here...
I like the 235/265 combo with 8.5 & 9.5 wheels

Caddyshk · 03-17-2013, 05:10 PM

This is what I currently have on those wheel sizes

235/40ZR18 Hankook Ventus R-S3
265/35ZR18 Hankook Ventus R-S3

mike519 · 03-17-2013, 05:13 PM

Thanks guys, that's what I will go with. Sounds logical to me.

03-15-2013, 08:47 PM	#1
mike519 Captain 129 Rep 832 Posts Drives: 2018 M240i Join Date: Apr 2012 Location: Waterloo, Ontario iTrader: (0)	Tire sizes for new wheels OK, I am getting the EC7s from the GB soon and for now, I am going to put the stocks on them, pretty certain sizes are fine. I am picking up: 18x8.5et35 fronts - stock tires are 225/45 18x9.5et22 rears - stock tires are 255/40 As soon as I can afford them, possibly even at the same time if I can make it work, I am going to pick up PSSs. I know I can obviously pick up the same size tires in PSS but I am wondering if there is a benefit to a different size than stock. Thoughts?
	Appreciate 0 Tweet Quote

03-16-2013, 09:38 PM	#3
mike519 Captain 129 Rep 832 Posts Drives: 2018 M240i Join Date: Apr 2012 Location: Waterloo, Ontario iTrader: (0)	So, assuming I go with 235 and 265, the next question of course is height of the tires. For fronts, if I go with 235/40, looks like the overall diameter is .5inch less. 1010 tire calculator shows this as a 2.2% variance over stock (within their 3% recommendation). I also, therefore, assume this allows me more room for lowering...maybe even adding a spacer to push the et35 wheel out a little. 45s are bigger and will likely hurt when it comes to lowering. For the rears, if I go with 265/35, diameter is .7inch less which equals a 2.8% variance. 40s would be .3inch (1.21%) bigger...not sure if this is as big a deal so I could go with either size here I think. Thoughts?
	Appreciate 0 Quote

03-16-2013, 10:31 PM	#4
Finnegan Dog Listener 701 Rep 7,850 Posts Drives: Z4M/. Z3M, E36/46 M3 Join Date: Oct 2008 Location: Teaching the dog to slalom iTrader: (22)	235/40 and 265/35 will work, so will 245/40 and 275/35. Course you can go with stock sizes too. Benefit? Hack's post touches on this. The wider tires give the rims some protection, and IMO they look good! The red car in this thread has your rim size and 245/40 275/35 tires.
	Appreciate 0 Quote

03-16-2013, 11:14 PM	#6
Finnegan Dog Listener 701 Rep 7,850 Posts Drives: Z4M/. Z3M, E36/46 M3 Join Date: Oct 2008 Location: Teaching the dog to slalom iTrader: (22)	Cool. It's really a matter of how it looks as any of those sizes in PSS will be quite sticky.
	Appreciate 0 Quote

03-17-2013, 12:15 PM	#7
Punko Second Lieutenant 20 Rep 250 Posts Drives: 07 Z4 M Coupe Join Date: Feb 2011 Location: Hamilton, ON iTrader: (2)	I have 245/40 and 265/40 on OEM suspension and wheels. These are OEM sizes for M3....lots of lightly used tires available.
	Appreciate 0 Quote

03-17-2013, 04:58 PM	#11
mike519 Captain 129 Rep 832 Posts Drives: 2018 M240i Join Date: Apr 2012 Location: Waterloo, Ontario iTrader: (0)	Perfect, thanks!
	Appreciate 0 Quote

03-17-2013, 05:10 PM	#13
Caddyshk M = Midlife Crisis 65 Rep 2,006 Posts Drives: 2006 Z4MC Interlagos Join Date: May 2007 Location: Fort Erie, Ontario, Canada iTrader: (0)	This is what I currently have on those wheel sizes 235/40ZR18 Hankook Ventus R-S3 265/35ZR18 Hankook Ventus R-S3 __________________ 2006 Z4MC - #LL93158 SS Race Cans, RE X Pipe, DKF Sec 1, Fabspeed Headers, OE STB, AS Shifter, Dave Z CDV, GC Coil Overs, Stoptech lines, Hawk DTC Pads, RE Clutch Stop, RE Transmission Mounts, Vibra-Technics Engine Mounts, Poly FCAB & RTAB, LeatherZ M Shift Boot, Tekarbon Rear Spoiler, CF Grills, Advan RS DGM
	Appreciate 0 Quote

03-17-2013, 05:13 PM	#14
mike519 Captain 129 Rep 832 Posts Drives: 2018 M240i Join Date: Apr 2012 Location: Waterloo, Ontario iTrader: (0)	Thanks guys, that's what I will go with. Sounds logical to me.
	Appreciate 0 Quote