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Just wondering if anybody has experience putting lower profile, wider tires on their 325xi or 330xi. Can a 215 or 225 tire work with the 7 inch rim? Lastly, I know that the wider tires compromise traction in wet or icy weather, but I'm wondering how much. Does a 215 really make that significant of a difference in traction? I'm in Seattle, so my driving is mainly going to be in rain (lots of rain...) with a little ice and snow in the winter. Thanks
 

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Head-In-Sand Dumbass
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I don't have any experience, but I can tell you a shorter (read as "lower") tire will throw off your speedometer. You may also notice a lower top-end speed, but that's not really an issue when your car limits you 35mph+ less than the actual top end. :)

You could easily go with a wider tire on the 7" rim... if you currently have 205/50/17 tires, you could easily go with a 225/45/17 tire. You would notice that the tire sidewall bends out beyond the exterior lip of the wheel, and while it isn't a bad thing your ride quality would probably decrease ever so slighty. :)

Use this to figure out what size you can go with, and what sizes you want to avoid:
http://www.miata.net/garage/tirecalc.html
 

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Do you know if we can go w/ a wider tire on our rims? I thinking like 255/35/17 in the rear.
 

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Standard tyres

The standard 325i tyre is 205/55R16? A 225/50R16 fits on the same 7Jx16" rim. Optionally a 205/50R17 on 7Jx17" is available.

The standard 330i tyre is 225/45R17 on 8Jx17" rim. Why would you want to go any lower?

The Type 68M wheel is 7.5Jx17" for 225/45R17 front and 8.5Jx17" for 245/40R17 rear.
 

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Re: Standard tyres

TGD said:
The standard 325i tyre is 205/55R16? A 225/50R16 fits on the same 7Jx16" rim. Optionally a 205/50R17 on 7Jx17" is available.

The standard 330i tyre is 225/45R17 on 8Jx17" rim. Why would you want to go any lower?

The Type 68M wheel is 7.5Jx17" for 225/45R17 front and 8.5Jx17" for 245/40R17 rear.
I'm not sure I even want to - I'm just wondering if I have the option of going wider (for looks and performance):

235/40/17 - Front
255/35/17 - Rear

?
 

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Head-In-Sand Dumbass
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thaydith, you certainly could, as someone has on this board. I can't find the thread now though. As for the fronts, 235/40 would be a full 1.2cm shorter than your current 225/45, so that might not be advisable. I thought about doing the 255/40 rear tire, as it matches better with the 225/45 (101.25mm front/102mm rear sidewall height) but I figured those pesky BMW engineers had already considered the differences between 225/45 and 245/40 and compensated for it in one way or another... or maybe it just doesn't make a damn bit of difference. :p
 

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I have 215/45 tires on my car and like them.
 

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Nick325xiT 5spd said:
I have 215/45 tires on my car and like them.
Was that an upgrade or downgrade width-wise? I have your wheels for winter with 205/50/17 on em.
 

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webguy330i said:


Was that an upgrade or downgrade width-wise? I have your wheels for winter with 205/50/17 on em.
Stock was 205/50 17.
I'm trying to decide whether to go to 225/45 or stick with 215/45 next time around.
In all likelihood, though, I'll stick with the same width to avoid tramlining, cut noise, and retain the miniscule gearing advantage. (IMHO, the gearing is STILL too tall.)
 

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webguy330i said:


Was that an upgrade or downgrade width-wise? I have your wheels for winter with 205/50/17 on em.
205/50/17 are the stock SP xi package.
 

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OMGWTFBBQ
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Nick325xiT 5spd said:


Stock was 205/50 17.
I'm trying to decide whether to go to 225/45 or stick with 215/45 next time around.
In all likelihood, though, I'll stick with the same width to avoid tramlining, cut noise, and retain the miniscule gearing advantage. (IMHO, the gearing is STILL too tall.)
Next spring I'm moving to 225/45 if I stay on 7" wheels and 235/40 (maybe even explore 245/40) if I go to 7.5 or 8. But you know why :D
 
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