Join Date: Jun 2007
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Originally Posted by mosc
Q: The rim I want has a different offset than stock. How far from stock can I be? Why does it matter?
The stock offset is 53 mm. This means your rim is mounted to the hub about two inches further out than center. The suspension expects the center of the rim to be there accordingly. Changing the offset more than a few mm is unwise. You can seriously hinder the stock suspension's capabilities. Try to stay within 5 mm of stock so, basically, no less than 48 mm. Is 47 so bad? No, but <40 sure is. It's a gradual thing. 5mm is just a rule of thumb. Balance the decrease in performance due to offset issues against what you'll be gaining in tire though.
The reason for all the offset concern is people wanting rims that are not designed for a WRX. Other cars out there mount closer to center which means they have smaller offsets. Wheel companies want to sell their rims to lots of different cars but few have the high offset of a WRX. Since lower offset rims will indeed fit (they'll just stick out more and move the center line further towards the hub), lots of companies will be more than happy to sell you them despite the reduction in handling.
Offset because of this also limits how wide a rim/tire you can use. Even at 48mm offset (already about as far as you should go), putting fatter than about a 225 tire on there can cause rubbing, especially when lowered. This corresponds to about an 8" wide rim.
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