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Technical Topics Wheels and Tires G20 Winter wheel and tire thread - post your setup!

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      12-31-2019, 03:15 PM   #67
Sentinel88
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Winter Setup:
18 x 8 Sparco Assetto Gara Black wrapped in 225/45/18 Blizzak WS90s
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      01-02-2020, 03:32 PM   #68
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19" OEM with Continental Winter Contact 860P 225/255
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      01-08-2020, 04:48 PM   #69
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cidair do the tyres has BMW “star” ? I’m considering wear 19” winter tyres but can’t find does BMW allow it ?
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      01-11-2020, 01:47 AM   #70
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No star on these . Just " plain " Contis.
BMW didn't supply these. Only 18" setups. So I put these together myself.
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      02-27-2020, 10:05 AM   #71
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Opinions on fitment/style?

Hello everyone!

I'm trying to vet a winter wheel and tire setup for my car on order. I will be running the staggered 19" 792M in summer and want to downsize to square 18s with slightly larger width (235 vs. 225) for improved traction and benefit from a taller sidewall for winter compared to stock. I'm new to the whole offset concept and I'd heard that only some 18" as a result work on the M340i because of the brakes. My configuration is a BSM RWD without the ZTK package.

I've found this combo of BBS XR and Pirelli Sotozero 3, and ran a simulation versus stock 18" 790M (225/45/18 ET25) through this site:

Here's the specifics:

BBS XR, 18x8 ET28
Pirelli Sottozero 3, 235/45/18 94V with Self-Sealing

On-car BBS XR pics on a BMW hard to find in the wild, but the design is very similar to the BBS CH-R, here's a view:



The wheels seem very similar fitment-wise to the BBS SR I've seen a few posters with, just the offset seems to be different (SR is ET30, XR is ET28).

Also curious what the community has to say about self-sealing tires, the cost difference is negligible and they seem to have none of the drawbacks of runflats, just are very rare. Seems like an ideal feature for a winter tire.

Appreciate your insights!
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      02-27-2020, 01:21 PM   #72
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I went with the bbs sr from tire rack and used my 245/45/18 Nokians. Fits great!
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      02-27-2020, 02:34 PM   #73
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Quote:
Originally Posted by StickForLife View Post
I've found this combo of BBS XR and Pirelli Sotozero 3, and ran a simulation versus stock 18" 790M (225/45/18 ET25) through this site:

Here's the specifics:

BBS XR, 18x8 ET28
Pirelli Sottozero 3, 235/45/18 94V with Self-Sealing
I would think 18x8 ET 28 with 235/45/18 should fit with no issues. If Tirerack lists the wheel for the car, then it fits. 235/45 is of course slightly wider and taller than OEM but will be similar to my setup, actually 0.3% shorter diameter, and I have no issues. You can always call Tirerack to discuss if you're not comfortable pulling the trigger.
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      02-28-2020, 10:15 AM   #74
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Thanks very much, will definitely get Tire Rack's opinion when I do pull the trigger. This configuration is not specifically vetted by them on the site for our car but it seems to make sense that it would work. They had no issues matching the tire size to the wheel size so it's just down to any quirks on the M340i specifically.

So is there a rule of thumb for what offset is needed compared to OEM? Or does it just have to be measured in each case?
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      02-28-2020, 10:33 AM   #75
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Quote:
Originally Posted by StickForLife View Post
Thanks very much, will definitely get Tire Rack's opinion when I do pull the trigger. This configuration is not specifically vetted by them on the site for our car but it seems to make sense that it would work. They had no issues matching the tire size to the wheel size so it's just down to any quirks on the M340i specifically.

So is there a rule of thumb for what offset is needed compared to OEM? Or does it just have to be measured in each case?
The lower the offset number the more the wheel pokes outward from the brakes. I would not buy any wheels with an offset higher (more inward) than OEM, especially considering brake clearance. How far you potentially can lower the offset depends on your fender clearance and your personal aesthetic taste. On most cars you're safe to decrease offset by 10mm and can go farther out of there is fender space and you like the look. People who use spacers effectively lower their offset by pushing the wheel out 10-20 mm. I personally don't recommend using spacers because they can be a hassle in multiple ways.
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      02-28-2020, 10:34 AM   #76
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Quote:
Originally Posted by StickForLife View Post
Thanks very much, will definitely get Tire Rack's opinion when I do pull the trigger. This configuration is not specifically vetted by them on the site for our car but it seems to make sense that it would work. They had no issues matching the tire size to the wheel size so it's just down to any quirks on the M340i specifically.

So is there a rule of thumb for what offset is needed compared to OEM? Or does it just have to be measured in each case?
Offset of 30 is the lowest I would want to go on an 8.5 wheel up front. Leaving very little room for any tire at et35. The 8” wide with et. 30 fits the 245 wide perfectly. Et25 would have been a little better up front for a more flush fit but, that wasn’t an option.
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      02-28-2020, 10:36 AM   #77
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Here's my favorite resource for comparing wheel/tire fitment.

https://www.rimsntires.com/specspro.jsp
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      02-28-2020, 03:55 PM   #78
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my new all season rear tires that I've bought off tirerack came with a lot of rubber hairs on the sidewalls, anyone know why they come like that? My front tires that came with the car does have have that many on them. What can I use to easily remove them?
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      02-28-2020, 06:46 PM   #79
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Quote:
Originally Posted by Transfer View Post
The lower the offset number the more the wheel pokes outward from the brakes. I would not buy any wheels with an offset higher (more inward) than OEM, especially considering brake clearance. How far you potentially can lower the offset depends on your fender clearance and your personal aesthetic taste. On most cars you're safe to decrease offset by 10mm and can go farther out of there is fender space and you like the look. People who use spacers effectively lower their offset by pushing the wheel out 10-20 mm. I personally don't recommend using spacers because they can be a hassle in multiple ways.
Quote:
Originally Posted by NeverEnough007 View Post
Offset of 30 is the lowest I would want to go on an 8.5 wheel up front. Leaving very little room for any tire at et35. The 8” wide with et. 30 fits the 245 wide perfectly. Et25 would have been a little better up front for a more flush fit but, that wasn’t an option.
Quote:
Originally Posted by Transfer View Post
Here's my favorite resource for comparing wheel/tire fitment.

https://www.rimsntires.com/specspro.jsp
Thanks very much for all that information!
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