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The Tire Rack's Tire & Wheel Forum
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Old 11-28-2010, 06:57 PM   #1
MasterC17
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255/40/18 Front 255/35/18 Rear on ZHP Wheels

Almost positive this is fine but - would it be alright to put 255/40/18 tires on my rear ZHP wheels rather than the factory 255/35/18's? The front's will be factory 225/40/18's. Same brand & model tires obviously. Basically, will it rub or cause undesired handling issues? Thanks!
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Old 11-28-2010, 07:26 PM   #2
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Aside from people telling you that 255/40/18 being too tall, that size tire should work on your car, especially on stock wheels and offset. The only downside is that your speedometer will be a little off (inaccurate).
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Old 11-28-2010, 10:14 PM   #3
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this^^^

If you're slammed then u will have problems maybe but other than that no
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Old 11-29-2010, 04:25 PM   #4
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If it slows down the speedo, I might go that way. Mine shows faster than it's actually going with proper tires.
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Old 11-29-2010, 08:03 PM   #5
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Ok, so just for kicks how would 255/40/18's in the front and 255/35/18's in the rear work? The car is not slammed so I won't rub in the rear but not sure about the front. I have two sets of ZHP wheels at the moment so I could mount 4 rear's with the tires if it works.

Last edited by MasterC17; 11-30-2010 at 05:24 PM.
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Old 11-29-2010, 08:23 PM   #6
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In addition to the speedometer being off (which could have potential implications to ABS, DSC, etc and especially with different diameters front and rear), larger diameter tires will also make your car a tad slower. The 255/40/18 with your stock 3.07 rear end would be the equivalent of the stock 255/35/18 tires with 2.95 gearing.
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Old 11-29-2010, 09:13 PM   #7
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I'm not sure it'd work... that is a large height difference in tires. That is an E46 M3 size. Would you like to sell me one set of you zhp wheels, front, rears, or whatever? PM me.
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Old 11-29-2010, 09:15 PM   #8
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Old 11-30-2010, 02:32 AM   #9
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no knowledge here just wondering.......my Ducati 998 2002 was still running a mechanical speedo so changes in circumference were mute.

So E46+ are electrical/sensor input ?
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Old 11-30-2010, 05:55 AM   #10
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Sorry I should have said this before - this setup will be used on the track, so don't care if speedo or dsc work, abs I want though. At the moment I have all-season 225/40/18's all around (previous owner) so the speedo is already off.

zhp43867 I'm not sure exactly what I'm doing yet, but I may have a set for sale in the spring so I will let you know then if you still want them.
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Old 11-30-2010, 07:55 AM   #11
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Not at all sure why you would want a taller/softer sidewall with less precise handling and taller effective gearing for track use (unless perhaps you are trying to avoid a gear shift on a particular course?). Rubbing issues will depend on your suspension and the specific model of tire you choose to run (dimensions vary widely even for tires of the same size).
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Old 11-30-2010, 12:48 PM   #12
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The larger overall diameter will impact the rebound rate of your suspension.
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Old 11-30-2010, 05:23 PM   #13
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Alright, yet again sorry for the confusion. I keep answering this thread late at night/early in the morning - now for an intelligent response.

Current Factory Setup:
Tires: Michelin PS2's
Front: 225/40/18
Rear: 255/35/18

Proposed Setup:
Tires: Michelin PS2's
Front: 255/40/18
Rear: 255/35/18

Would I need four rear ZHP Wheels to fit the 255 on the front?

I keep reading that a square setup is best for the track, and these are the tires I have. Basically, all I'm changing is the front tires from 225's to 255's. What do you think of this setup? Is there a better way to go in terms of sizes? Thanks
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Old 11-30-2010, 06:49 PM   #14
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You would need to change the aspect ratio on the fronts if you are going wider. The proposed setup is 1/2 inch taller in the front. I do not know if the width will clear, but 255/35/18 all around would work as far as overall diameter. you cannot have too much of a size differential front to rear.
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Old 11-30-2010, 09:33 PM   #15
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Get 4 ZHP rear wheels and run 255/35/18. That would be the best setup.
Kris runs this setup on his ZHP sedan.
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Old 12-01-2010, 09:05 AM   #16
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Could you run a 235/40/18 on the ZHP front wheels?
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Old 12-01-2010, 11:15 AM   #17
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I've got a set of ZHP rims (staggered) here in MA that I just took off and am looking to sell. They aren't pretty but both rears have been trued at Rimpro. The fronts are in better shape but have been curbed a fair amount also. They need work but I'm looking for short money for them. Based on your build thread (which was teriffic by the way) you aren't afraid of a little hard work.

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Old 12-01-2010, 12:49 PM   #18
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Quote:
Originally Posted by MasterC17 View Post
Alright, yet again sorry for the confusion. I keep answering this thread late at night/early in the morning - now for an intelligent response.

Current Factory Setup:
Tires: Michelin PS2's
Front: 225/40/18
Rear: 255/35/18

Proposed Setup:
Tires: Michelin PS2's
Front: 255/40/18
Rear: 255/35/18

Would I need four rear ZHP Wheels to fit the 255 on the front?

I keep reading that a square setup is best for the track, and these are the tires I have. Basically, all I'm changing is the front tires from 225's to 255's. What do you think of this setup? Is there a better way to go in terms of sizes? Thanks
Your front tires are too tall. Furthermore, you need at least an 18x8.5 inch wheel to run 255/35R18. So no... you cannot run that on your current setup.


If you're so concerned about track performance, you're better off buying a dedicated set of lightweight 17x8.5 inch wheels and running 255/40R17. I know Kosei wheels run pretty cheap, but are good quality.
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Old 12-01-2010, 02:05 PM   #19
MasterC17
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Quote:
Originally Posted by MrMotorwerk View Post
Get 4 ZHP rear wheels and run 255/35/18. That would be the best setup.
Kris runs this setup on his ZHP sedan.
That's exactly what I was thinking except 255/40's on the front - the same as what they came with from the factory except wider. Is there any reason they were taller in the front from the factory? Was it to compensate for the smaller diameter?

Quote:
Originally Posted by Robbski View Post
I've got a set of ZHP rims (staggered) here in MA that I just took off and am looking to sell. They aren't pretty but both rears have been trued at Rimpro. The fronts are in better shape but have been curbed a fair amount also. They need work but I'm looking for short money for them. Based on your build thread (which was teriffic by the way) you aren't afraid of a little hard work.
Thanks but I already have two sets so I think I'm good for the moment

Quote:
Originally Posted by Penguin Koolaid View Post
Your front tires are too tall. Furthermore, you need at least an 18x8.5 inch wheel to run 255/35R18. So no... you cannot run that on your current setup.


If you're so concerned about track performance, you're better off buying a dedicated set of lightweight 17x8.5 inch wheels and running 255/40R17. I know Kosei wheels run pretty cheap, but are good quality.
I have 4 18x8.5 Rear ZHP Wheels. I have two mounted w/ 255/35/18's and two unmounted. I am proposing that I mount two 255/40/18's on the unmounted ones and put them in the front. Why not 255/35/18's? Because the factory had 40's in the front. What I'm confused by is why, and is it fine to do the same. Honestly, I can't afford another set of wheels and tires atm. I'll be selling my all-seasons and other wheels once spring comes. Unless I find a set of Apex 18's for $700 I'll be keeping the ZHP wheels.
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Old 12-01-2010, 02:18 PM   #20
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A 225/40/18 is esentially the same diameter as a 255/35/18, both of which are roughly an inch smaller in diameter than a 255/40/18. This is why the stock staggered tire sizes are 225/40/18 front and 255/35/18 rear, to keep the same diameter front and rear.

I think you are confused about tire size notation. The 18 in the sizes above is the wheel diameter in inches. The 255 or 225 is the tire's section width in mm. The 35 or 40 is an aspect ratio. In other words, a value of 40 means the sidewall height is 40% of the section width. Since the 40 represents an aspect ratio, the sidewall gets taller (and thus the overall tire diameter gets larger) as the section width gets wider for a constant AR. This is why a 255/40/18 has a larger diameter than a 225/40/18.

Ref: http://www.tirerack.com/tires/tirete....jsp?techid=46
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