Hey everybody, I'm new to the forum. I just had a question on a rim I wanted to put on my 240, its a set of 15x7 bmw rims(plan on getting adapters) but was wondering if anyone has more knowledge on what size adapters I should get, I was figuring at least 20mm would be fine but dont know lol

 

ok to fit rims on a car there are four key variables 1) bolt pattern 2) offset 3) center bore (since Volvo's are hub centric, the center flange is what keeps the wheels centered - not the bolts) 4) bolt/nut style (ie conical vs spherical)

So for starters, a great resource for this info is wheel-size.com.
Lets say yours is a 1990 240. Your stock rims are a 5x108 mm bolt pattern, your offset (distance from the center of the rim to the hub's vertical plane) is 20 or 25mm, the CB is 65.1mm and you can find the bolt/nut style on IPD etc.

Now as to the BMW rims. BMW's pretty much uses a 5x120 bolt pattern. Depending on year, older models used a 25mm offset newer went to 45 mm (say mid-late 90s) and have a 72.6mm center bore. If you have the rims already (which I assume you do otherwise its a long way to go to get new rims), look for a stamping that says ET47 or something like that. If you have older rims with an ET25, the rims are gonna be set wider than stock and will likely stress out your bearings over time and have driveability issues (tire nibbling on every crack in the road)

What this tells me it you'd need to go with the bigger offset BMW wheels (say from a 97 320), use an adaptor that is about 20 mm thick (3/4" or so) and then deal with hub centric rings to get the center bores to work out. Just make sure the adaptor comes with the correct wheel nut style that matches to BMW rims.

 

okay, they are e30 m3 rims, attached is what i could find on them,

 

so the problem is the offset of the rim will be based on the adaptor not the hub and this will push the wheels out by the thickness of the adaptor.

 

right, and i was wondering how big of an adaptor i should go with, so that it wont rub, i dont mind rolling fenders if i have to.


i think 25 mm adapters should do it, think i might try that