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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 12-03-2013, 08:49 PM
brandon7382 brandon7382 is offline
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Question on xdrive rims set up

Hi, im new to 335i coupe xdrive. It might be a stupid question for someone but I can't find it on the forum search, so sorry . I have the factory 18" on right now, are they all the same size 18x8??? Can I switch it to 18X8.5 front and 18x9.5 rear or 19x8.5 front or 18x9.5 rear???? Would that cause any problem with the traction or I have to stick with all the same size for AWD?? If I can change it then what would be the best setup for 18" and 19" Thank you
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Old 12-03-2013, 09:10 PM
icon5585 icon5585 is offline
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Staggered setup is optional on xdrive models so most likely they're all the same, but there's nothing stopping you from running your own staggered setup
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Old 12-03-2013, 09:18 PM
brandon7382 brandon7382 is offline
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Originally Posted by icon5585 View Post
Staggered setup is optional on xdrive models so most likely they're all the same, but there's nothing stopping you from running your own staggered setup
Thanks for your replied. But would that affect the traction/safety and performance
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Old 12-03-2013, 10:40 PM
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Pat_X5 Pat_X5 is offline
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Going staggered is great for traction on dry but not good on snow.

Staggered is great to prevent oversteer as the wider rears will understeer than square setups (all the same all around).

Tire rotation is awful because all you can do is left to right vice versa for non directional tires. If you get directional tires then they will never be able to rotate.
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Old 12-04-2013, 12:04 PM
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kunal_D kunal_D is offline
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Quote:
Originally Posted by brandon7382 View Post
Hi, im new to 335i coupe xdrive. It might be a stupid question for someone but I can't find it on the forum search, so sorry . I have the factory 18" on right now, are they all the same size 18x8??? Can I switch it to 18X8.5 front and 18x9.5 rear or 19x8.5 front or 18x9.5 rear???? Would that cause any problem with the traction or I have to stick with all the same size for AWD?? If I can change it then what would be the best setup for 18" and 19" Thank you
I wouldn't recommend this on an x-drive. Even if the diameter of the rim is the same, the tire diameter will be different, as the aspect ratio is a percentage of tire width. Even a small difference like this can cause damage to the transfer case.

If you do end up running staggered rims, then using the same size tires front and rear might work, but once again do this at your own risk.
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Old 12-04-2013, 12:26 PM
fdriller9 fdriller9 is offline
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First of all, if you run a staggered setup on a xdrive car, the front vs rear rolling diameters need to be within 1% of each other. That means you're going to stretch the tires on one axle, which gives less sidewall, increased road noise/feel, and no wheel protection.

Secondly, most cars are usually setup from the manufacture to understeer. Running a staggered setup increases under steer. If you're looking to improve performance, this will decrease performance. IMO, anyway. Under-steering is safe for inexperienced drivers but if you know how to control over steer, under steering is very annoying.
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Old 12-04-2013, 12:33 PM
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I prefer the reverse stagger. 20's on the font. 16's on the rear
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