I just got a screaming deal on some 18" bmw parallel m rims with good tires. But I've searched all over the site and I can't seem to find my answer. Will the tires fit. All 245/45/18 I know speedo will be off a little but not a big deal to me. Its same for all 4 tires and lowering 1" with eibach pro kit. Will all of this fit and possible size for spacers? Has a pbr rear end stock rs 305 front.

 

Your going to need wheel adapters. They have a different lug pattern. BMW has a 5x120 and the third gens have a 5x4.75.

 

Yes but after reading post that lug pattern is the same off a smidge. But still fit.

 

That means your conical lug nuts won't be centered in the hole so it really is not as safe. The won't be as much holding power on that lug but. Its better to use the correct lug pattern

 

I understand that plenty of horror stories on it but a lot of ppl seem to run the bmw 5x120 with no issues

 

Its 1/16th of an inch..

 

Bump

 

without providing offsets or widths of wheels your guess is a good as ours. if you dont have the specs why dont you just put them on and try them, you already bought them? i would never buy rims without knowing if they would fit...

as far as the speedo is concerned, at 60mph you will be actually doing ~63mph

 

Rims are 8/8.5 width offset not sure. I already planned on making corrections with spacers so wasn't too worried cause I need spacers regardless because of the front.

 

How do I figure out offset. And make the measurement for what spacer I would need?

 

Geta tape measure and a straight edge. ..

91' firebird .. 305 TBI .030 over , balanced bottom end , speed pro hyper flattops , 10.6:1 CR , all ARP rod bolts and main studs , melling HV oil pump , trick flow super 23 175cc heads, Howards HR 214/218@.050 .488/.495 lift on 114 LSA , full roller 1.6 RR = .520/.528 lift , summit dual plane intake port matched , shorty headers into 2.5" Y w full 3" flow master system and 3" cutout in front of axle , msd billet dizzy, 620cfm TBI , custom CAI , tubular adjustabke LCA pan hard , umi torque arm wonder bar , BMR trans cross member , COMP engineering SFC's, disc rear w 4.10's, drilled an slotted rotors, EBL flash , VRFPR, WBO2,

 

If you need spacers anyways then why don't you just get the adapters and do it the right way?

 

Cause every time I look up 5x4.75 or 5x4 3/4 to 5x120 there is nothing. I would have to find somewhere that would make them.

 

Actually just found them 5x4.75 to 5x120. Ok ill measure offset but will a 245/45/18 fit up front with no rubbing or do I need a different size? I can't just fit it cause I need the spacer. If anyone is running that size your input would be very appreciated.

 

You won't have any trouble with a 245 tire

 

I measured my offset I got +12.7mm what spacer size should I get??

 

The offset will fit the car wi th no spacers. You could use a slip on 10mm spacer if you want but that will require longer wheel studs.

People use the 5x120 pattern on these cars all the time. Its totally incorrect but common practice. The argument as to wether its safe or not will go on forever.

Feisty if you get hubcentric rings for the wheels to adapters from the 72.6 center terribly bore to 70.3 you can but wobble nuts which will center properly on th e studs. They are a more proper way to fit these wheels short of redrilling the lug holes. I have a thread on r edrilling wheels here on the boards

 

So I can get front 10 mm hubcentric spacers for the front. And rears will fit just normal