Wheel fitment advice

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Georgej10
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Wheel fitment advice

Post by Georgej10 » Thu Jan 11, 2018 1:26 pm

Hi, i'm new to the forum after picking up my M135i LCI in November after coming from a 2014 S3. In the near future i'm looking to change the OEM wheels as they don't really do it for me. I have trawled through the wheel thread to try and find my answer yes I've probably seen it but the wheel spec's and offsets etc confuse the hell out of me so I feel i'm no further on, so sorry if this question has been asked numerous times before.

Basically i'm fancying either of the following from CS wheels:

19" Staggered 763M M4 CS: Front - 19x8.5 ET40 Rear - 19x9.5 ET45

19" Staggered 405M: Front - 19x8.5 ET40 Rear - 19x9.5 ET45

Would either of these be suitable or am i looking at clashes? Also any advice on whether 19's will also reduce the quality of handling/performance etc will be more than welcome. One thing worth noting is that I possibly will go for some Eibach lowering springs also so would this have an effect?

Cheers

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Re: Wheel fitment advice

Post by marco_polo » Thu Jan 11, 2018 2:41 pm

19's will obviously reduce the ride quality/handling/performance, you'll want 17's if that's a priority. Lowering doesn't make any difference to wheel fitment really.

9.5" at ET45 is going to be very stanced on the rear, with zero rim protection (as you'd need to stretch a tyre on).

Why not run the 19" x 8.5" ET40 all round (with 245/30 fitted)? That would still look very aggressive.
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Re: Wheel fitment advice

Post by Georgej10 » Thu Jan 11, 2018 3:06 pm

Cheers for the replies.... ride quality isn't that important for me. I would be happy to stay at 18's, I suppose once i have Eibach's fitted the arch gap will be reduced anyway.

I would like a more aggressive look but not over the top so your advice sounds good, with regards to having 245/30 on the front are there any downsides to that with the OEM setup being staggered?

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Re: Wheel fitment advice

Post by marco_polo » Thu Jan 11, 2018 3:30 pm

Wheel size has nothing to do with arch gaps, you fit bigger wheels with much smaller profile tyres, the gap remains identical. Or tiny wheels with huge profile tyres, again, identical gaps. Overall diameter has to stay basically the same or it upsets the speedo/ABS/Traction Control/etc.

Non-staggered is fine, most of us (with aftermarket wheels) run a square set-up.

I'm running 245's on the front (same tyre width as a standard BMW M2). They give you less understeer, less weird shoulder wear, and are much less likely to overheat during repeated heavy braking (stock 225's melt). The downside is they're not so clever over deep standing water, so you need to be mindful of big puddles during downpours.
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Re: Wheel fitment advice

Post by Georgej10 » Thu Jan 11, 2018 4:02 pm

Ok that makes sense, cheers for the tutorial :lol:

So with regards to having 245/30's all round and the current setup being 225/40 & 245/35 does this not upset traction, ABS etc. with the sidewall profile being smaller?

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Re: Wheel fitment advice

Post by marco_polo » Thu Jan 11, 2018 4:06 pm

19" on 245/30/19 (big alloy wheel + small profile tyre) is considered the same overall diameter as 18" on 245/35/18 (smaller alloy wheel + bigger profile tyre).

About 0.1% difference, less that 1mm on diameter, negligible.

225/40/18 and 225/35/19 are also considered to be the same overall diameter, for example.
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Re: Wheel fitment advice

Post by Georgej10 » Thu Jan 11, 2018 4:24 pm

In your first response when you mentioned running 8.5" ET40 square with 245/30 i'm guessing this was referring to 19's? hence reducing the profile to keep the diameter basically the same as the OEM setup?

If i was to stay on 18's would 8.5" ET40 square still apply but with 245/35 all round?

I think i'm now starting to understand this field better mate haha. Cheers for your help

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Re: Wheel fitment advice

Post by marco_polo » Thu Jan 11, 2018 4:34 pm

Yup, the first response was about 19" x 8.5" wheels.

I'm running 245/35/18 square on ET40 wheels, which works pretty well in my experience.

If you want to go wider than 245mm on the back you'll probably need more offset, ideally ET44+ for 255mm, and ET49+ for 265mm
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Re: Wheel fitment advice

Post by Georgej10 » Thu Jan 11, 2018 4:41 pm

Perfect thanks for clearing that up.

I know some people run spacers say 12mm front and 15mm rear, would you need to increase the ET offset the said spacer amount (15mm) if you wanted to fit say 255mm on the rear's?

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Re: Wheel fitment advice

Post by marco_polo » Thu Jan 11, 2018 4:49 pm

Spacers decrease the offset. A standard ET52 rear wheel plus a 15mm spacer = new offset of ET37.

If you're buying new wheels, just buy some with the correct offset in the first place and avoid the whole spacer bodge!
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Re: Wheel fitment advice

Post by Georgej10 » Thu Jan 11, 2018 4:53 pm

Ok got you, so if i got a set of 18's 8.5" ET40 square your effectively doing the same as 5mm spacer at the front and 12mm rear?

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Re: Wheel fitment advice

Post by Georgej10 » Thu Jan 11, 2018 4:54 pm

I suppose i also need to take into account the increase in the new rim size on top?

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Re: Wheel fitment advice

Post by marco_polo » Thu Jan 11, 2018 5:03 pm

Georgej10 wrote:
Thu Jan 11, 2018 4:53 pm
Ok got you, so if i got a set of 18's 8.5" ET40 square your effectively doing the same as 5mm spacer at the front and 12mm rear?
The centreline of the front tyre will move 5mm, and rear 12mm. :D
Georgej10 wrote:
Thu Jan 11, 2018 4:54 pm
I suppose i also need to take into account the increase in the new rim size on top?
Yup, the new alloys are wider than standard, and that has an effect on perceived 'poke' too (hence why I wouldn't recommend 9.5" ET45 rears).
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Re: Wheel fitment advice

Post by Georgej10 » Thu Jan 11, 2018 6:06 pm

Spot on thanks for that mate. I think I’ll go with the same or very similar setup to yourself. I don’t want to go OTT on the stance but would like to increase it. Are you running 8.5”? I’m guessing this would give a nicely improved stance compared to standard

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Re: Wheel fitment advice

Post by marco_polo » Thu Jan 11, 2018 6:10 pm

I'm on 18" x 8" ET40 all round, which is a very common fitment on here.

8.5" would fit the same, but appear slightly more aggressive (being 1/4" closer to both suspension struts and arches).
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