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  BMW Forums » BMW discussion forums » BMW Z-Series
  Offsets... is 15mm too much for a ET25 on a stock MC?

 Offsets... is 15mm too much for a ET25 on a stock MC?



I recently purchased a set of BBS RKII's (18's) from someone local, however they did not carry spacers.

I just ordered a pair of 15mm spacers from RogueEngineering? Is this too much, people seem to go with 10mm for BBS wheels. Can someone get back to me soon, so I could see if they should ship the 10mm instead. Thanks!

Also, the offsets on these are ET38 Front/ ET25 Rear.
   Reply » Offsets... is 15mm too much for a ET25 on a stock MC?

Stock rear on an MZ3 is 8mm, so 25 - 15 = 10, should be about right.

Stock front is about 40 mm, so should be fine without spacers.

   Reply » Offsets... is 15mm too much for a ET25 on a stock MC?

So, it should fit fine then? I am running a 265/35 in the rear and the rim itself is 18x10. The fronts are 225/40 at 18x8.5.

Side note: I originally thought the RKII's lip would be a little bit deeper, but it's not. However, the polished lip is a definite must! I'll post pics as soon as I get them on and when my spacers come in.

   Reply » Offsets... is 15mm too much for a ET25 on a stock MC?

with a 225 on an 8.5 it will be close on the front with a 38mm offset but ok, the rear will be no problem

I'm not sure how PineKone came to his conclusion without having the wheel width and tire sizes

   Reply » Offsets... is 15mm too much for a ET25 on a stock MC?

Doh, just figured from stock, didn't think about rim width issues.

Especially since rim widths weren't mentioned at that point. But anyway for a 5mm difference, I would try them out. If they don't fit,and 10mm is really needed, then order a set.

   Reply » Offsets... is 15mm too much for a ET25 on a stock MC?

Quote:
Doh, just figured from stock, didn't think about rim width issues.

Especially since rim widths weren't mentioned at that point. But anyway for a 5mm difference, I would try them out. If they don't fit,and 10mm is really needed, then order a set.
I spoke with someone at Rogue Engineering, they said it should be okay. However, if it isn't, and I try the 15mm spacers (i.e. install them), then they are not returnable, so i'd be screwed.

He mentioned that i should used washers to determine exactly how much i need first. Good idea?


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