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The Tire Rack's Tire & Wheel Forum
Use this forum to discuss anything in relation to wheels to tires to offsets.
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Old 12-11-2013, 07:10 PM   #21
imDerpz
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Quote:
Originally Posted by TallSkinnyMatt View Post
I agree with this. I wouldn't run a staggered tire setup with an AWD model. I would recommend a nice square setup. A friend of mine is running 255's on style 44's all around with his sedan. Even though thats exaggerated, you could easily run 245's all around if you wanted!
Cool of you to post your opinion. I was actually just checking out your build thread earlier today. Good stuff man, especially loving your brushed aluminum trim. I'm in the process of Suede wrapping mine.
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Old 12-11-2013, 08:48 PM   #22
bee-em-dougle-u
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Hey imDerpz,

Your tires now have a diameter of about 25.1", so a good combo would be 18x8.5 wheels all around, a so-called square setup, and 225/40ZR-18 tires, like the Continental ExtremeContact DWS. Do this and your diameter will stay at 25.1" and your speedometer reading will be unaffected. I'm assuming you want to stay in the UHP all-season category.

Put that tire size into the search engine at the Tire Rack site, and it'll call up a lot of possibilities. For each tire, click on the "specs" tab and look at tire diameter for that size, just to make sure it's at or very close to 25.1"

Good luck!
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Old 12-11-2013, 09:48 PM   #23
imDerpz
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Originally Posted by bee-em-dougle-u View Post
Hey imDerpz,

Your tires now have a diameter of about 25.1", so a good combo would be 18x8.5 wheels all around, a so-called square setup, and 225/40ZR-18 tires, like the Continental ExtremeContact DWS. Do this and your diameter will stay at 25.1" and your speedometer reading will be unaffected. I'm assuming you want to stay in the UHP all-season category.

Put that tire size into the search engine at the Tire Rack site, and it'll call up a lot of possibilities. For each tire, click on the "specs" tab and look at tire diameter for that size, just to make sure it's at or very close to 25.1"

Good luck!
Thank you so much for your help. I'm new to e46 fanatics and its helpful people like yourself that made me want to join.
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Old 12-11-2013, 09:58 PM   #24
imDerpz
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Sorry one aditional question. What does the zr mean in 40zr?
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Old 12-11-2013, 10:23 PM   #25
bee-em-dougle-u
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Thank you so much for your help. I'm new to e46 fanatics and its helpful people like yourself that made me want to join.
Thanks, I really appreciate that! The board is full of great info and helpful people, but also populated by a few mouth-breathing idiots as well. Luckily, they're easy to spot and avoid.

I had another thought about your wheel/tire setup. If it were my car, I'd live with a little speedometer error and go with a 245/35-18 tire and lower the car just a little. That size would look a little better on the 18x8.5 wheels. The 225/40-18s will be fine, though. Also, if you want sort of a staggered look with a square setup, you could always go with a small spacer (say, 5 mm) and longer wheel bolts on the rear wheels.

The ZR? The Z is the speed rating, and the R stands for radial construction. Zs are good to 150 mph; H is 130 mph, IIRC.
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Last edited by bee-em-dougle-u; 12-11-2013 at 10:26 PM.
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Old 12-11-2013, 10:52 PM   #26
imDerpz
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Wheel and Tire Question

Quote:
Originally Posted by bee-em-dougle-u View Post
Thanks, I really appreciate that! The board is full of great info and helpful people, but also populated by a few mouth-breathing idiots as well. Luckily, they're easy to spot and avoid.

I had another thought about your wheel/tire setup. If it were my car, I'd live with a little speedometer error and go with a 245/35-18 tire and lower the car just a little. That size would look a little better on the 18x8.5 wheels. The 225/40-18s will be fine, though. Also, if you want sort of a staggered look with a square setup, you could always go with a small spacer (say, 5 mm) and longer wheel bolts on the rear wheels.

The ZR? The Z is the speed rating, and the R stands for radial construction. Zs are good to 150 mph; H is 130 mph, IIRC.
How much speedometer error are we talking like 2-3 mph or what?


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Old 12-11-2013, 11:02 PM   #27
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Probably in that range. If the tire's a little smaller in diameter than stock and the speedometer actually reads a little high from the factory, you might end up getting a more accurate speed! (I think I have the logic right on that one!)
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Last edited by bee-em-dougle-u; 12-11-2013 at 11:07 PM.
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Old 12-11-2013, 11:11 PM   #28
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Wheel and Tire Question

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Originally Posted by imDerpz View Post
How much speedometer error are we talking like 2-3 mph or what?


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Honestly dude it's negligible. My dads Tacoma has 33's from the stock 27" tire size. At highways speed 110km/h or 70mph it's off by 8km/h or 5mph.


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Old 12-11-2013, 11:31 PM   #29
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Wheel and Tire Question

If your seriously concerned though check out this thread

http://forums.bimmerforums.com/forum...edometer-error


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Old 12-11-2013, 11:46 PM   #30
imDerpz
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Wheel and Tire Question

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Originally Posted by RyanTosi View Post
Honestly dude it's negligible. My dads Tacoma has 33's from the stock 27" tire size. At highways speed 110km/h or 70mph it's off by 8km/h or 5mph.


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Yeah I'm not too worried about 2 or
3 off because I'm pretty sure my car is
Already off by about that much. I had heard about the speedo corrector but I think their pretty expensive so we will see its worth it to buy.


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Old 12-11-2013, 11:49 PM   #31
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Wheel and Tire Question

Quote:
Originally Posted by imDerpz View Post
Yeah I'm not too worried about 2 or
3 off because I'm pretty sure my car is
Already off by about that much. I had heard about the speedo corrector but I think their pretty expensive so we will see its worth it to buy.


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It's $180


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Old 12-12-2013, 01:22 PM   #32
bee-em-dougle-u
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BTW, imDerpz, there's a thread on lowering the XI models on the XI forum right now. The car (and new wheels) will look a TON better if your drop it a little (and align it afterward). I'm not a fan of extreme lowering, as I like to retain the car's functionality.
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Old 12-12-2013, 01:50 PM   #33
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Originally Posted by imDerpz View Post
Thanks for that. Why would my rear tore pressure be higher then front though if they are all same size?


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Yes they can be different, even if the tires are the same size.

BMW factory specs the rear tire pressure to be slightly higher than the front, as it reduces oversteer. (Mitigating oversteer and a preference towards understeer is preferred by some manufacturers as it can be considered easier to control by the average driver.)
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Old 12-12-2013, 02:46 PM   #34
imDerpz
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Originally Posted by dreiundzwanzig View Post
Yes they can be different, even if the tires are the same size.

BMW factory specs the rear tire pressure to be slightly higher than the front, as it reduces oversteer. (Mitigating oversteer and a preference towards understeer is preferred by some manufacturers as it can be considered easier to control by the average driver.)
I would think that increasing the tire pressure which decreases surface area would lead to more oversteer due to the less surface area


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