17 or 18 wheels - looking for performance not looks

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martin10chk
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17 or 18 wheels - looking for performance not looks

Post by martin10chk » Wed Oct 31, 2018 7:29 pm

So M135i. Have standard heavy 18" staggered wheels with MPSS. Off the car at the moment (winter set on). Come summer would it be actually better to get some light 17" rims with UHP tyres? Say non-staggered 379 alloys for example. Tyres would be cheaper, the wheel tyre combo would be lighter. Any thoughts? Thanks

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marco_polo
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Re: 17 or 18 wheels - looking for performance not looks

Post by marco_polo » Wed Oct 31, 2018 7:36 pm

The only trouble with 17's is they tend to be quite narrow, otherwise a great plan, especially in the wet.

379's fit, and are 7.5" wide for example, which limits you to a 235/45/17 max width. Not an issue on track as we'd be running R Spec Semi's, but you might find them a little narrow with road tyres fitted?
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - M4 LCA's

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martin10chk
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Re: 17 or 18 wheels - looking for performance not looks

Post by martin10chk » Wed Oct 31, 2018 7:53 pm

Thanks Marco - good point. I wonder if with the right choice of tyre and running an LSD as I will by then whether 235 on rear might be OK. Not a big step down from the current 245. I am sort of tempted by way of an experiment! See if getting unsprung weight down actually feels any different.

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Re: 17 or 18 wheels - looking for performance not looks

Post by marco_polo » Wed Oct 31, 2018 8:04 pm

I think AEZ Sydney in 17x8" ET40 should fit over our callipers, would give you a few more tyre choices:

Image
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - M4 LCA's

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Re: 17 or 18 wheels - looking for performance not looks

Post by martin10chk » Wed Oct 31, 2018 8:14 pm

Nice! Good shout!

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Re: 17 or 18 wheels - looking for performance not looks

Post by Donz » Wed Dec 05, 2018 12:25 am

Hi Martin (and Marco!)

I’ve done just this and can say results have been excellent. I even dropped rears to 225 (7.5j) with a cup 2 tyres and I’m still winning! LSD will only help that performance.

I’ve actually just bought another muncher lighter set of 17’s with 8.5j rear so I can now compare the jump to a 255 section tyre!! A little more expensive ! Can’t believe Marco didn’t warn you about calliper clearance !! He’s always on about it.... and I’m very greatfull !!
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Re: 17 or 18 wheels - looking for performance not looks

Post by CoupeSilver » Wed Dec 05, 2018 2:58 pm

Titanium Silver E82 125i M-Sport Coupe (2011)

martin10chk
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Re: 17 or 18 wheels - looking for performance not looks

Post by martin10chk » Sat Dec 08, 2018 11:16 pm

CoupeSilver wrote:
Wed Dec 05, 2018 2:58 pm
This should answer your question:

https://www.youtube.com/watch?time_cont ... Pyg3ilw3KU
Thanks - that is really interesting. Nice to have a test which compares sizes across the same brand/model of tyre. The real surprise there was wet handling being best on the smallest wheel (well a surprise to me).

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