New wheels

Fed up with your run flats? Fancy a change of rubber?
Looking a new set of wheels? Get all your tyre/alloys info in here

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wobs
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New wheels

Post by wobs » Sat Aug 11, 2018 12:02 am

Having experienced the benefits of less unsprung weight on previous cars I'm thinking of getting some Oz leggera HLTs for my 2018 M140 to replace the stock 719s.

Oz recommend 8jx18 ET45 all round. Then it occurred to me that I could perhaps put 245/35 all round rather that 225/40 on the front and 245/35 on the back.

I've seen others have done this with ET40's, does anyone know if there'll be any clearance issues particularly inside of front wheels with ET45 or would I need say a 5mm spacer at the front?

Also what are the pros and cons of having a square setup with wider front tyres?

Thanks for any advice
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2016 F20 M140i auto (hers)

stag74
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Re: New wheels

Post by stag74 » Sat Aug 11, 2018 6:09 am

Nice looking wheels.
I'll be interested in the reply to your question.
I'm certainly considering come autumn putting Toyo winter tyres with correct tyre sizes now available (245 rears) on the oem alloys, as a winter set, and then putting the supersports on a new set of alloys.
Going square could put my current rear 245"s on the front being 50% worn, and a fresh pair on the rear.
That to me would be a nice combination of wheels and tyres to run.
If I change the car in spring 2020 (3 years old), the winters will have done 2 seasons, the new summers 1 season, my current supersport fronts could go back on the Oem wheels with plenty of tread left, and the new rears also back on the oem wheels with plenty of tread left. Could then sell the OZ's.
That would cost me over the estimated 50-60k miles a set of winter tyres, and a pair of rear supersports, and depreciation on the OZ"s.
It's a thought for sure!
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wobs
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Re: New wheels

Post by wobs » Sat Aug 11, 2018 12:12 pm

Similar to what I'm planning on doing. My wife's got a 140 as well and last year we put 235/40 Conti TS 830 winters on the back and 225/40 on the front. Couldn't find a 245 winter at the time but this has worked out pretty well. 235/40 is only 1.2% bigger diameter than the 225/40 on the front. I like the 830s so I might even think about 235 winters all round on the stock rims. Bit more rim protection as well.
One of my doubts about 245 all round was also water clearance on the wider PSS front so maybe a switch to Assy 3's down the line might be worth thinking about when I've worn out the PSS's. I ran Assy 3's on my Golf R and 435 and was quite impressed with them in the wet.
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stag74
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Re: New wheels

Post by stag74 » Sat Aug 11, 2018 12:22 pm

Regarding the wider front, maybe keeping the original supersports front and back.
I measured my tyre depth front and back this morning, they had 6mm remaining both on the front and back.
This has really surprised me I would have thought the rears to be less, after 15,000 miles. Quite remarkable really!
I didn't measure the original tyre depth when I bought her with 3,000 miles, would be interesting to know what depth they have when new.
Obviously I'm not trying hard enough!
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marco_polo
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Re: New wheels

Post by marco_polo » Sat Aug 11, 2018 1:41 pm

wobs wrote:
Sat Aug 11, 2018 12:02 am
Oz recommend 8jx18 ET45 all round. Then it occurred to me that I could perhaps put 245/35 all round rather that 225/40 on the front and 245/35 on the back.

I've seen others have done this with ET40's, does anyone know if there'll be any clearance issues particularly inside of front wheels with ET45 or would I need say a 5mm spacer at the front?
I run 245/35 on the front on 8" rims at ET40, and they're quite close; suspect a 5mm spacer is a good idea.

stag74 wrote:
Sat Aug 11, 2018 6:09 am
Going square could put my current rear 245"s on the front being 50% worn, and a fresh pair on the rear.
That to me would be a nice combination of wheels and tyres to run.
MPSS in 245/35/18 have rather poor drainage, very narrow grooves. I tried to run them on the front and ended up aquaplaning on the M20. If you really wanted to re-use the worn ones, I'd put them on the back personally - let a good pair of front tyres dry the road for the dodgy rears.

This is specific to the 245/35/18, the 255/35/18 MPSS are fine for example, as are 245/35/18 PS4
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Jahjaman
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Re: New wheels

Post by Jahjaman » Sat Aug 11, 2018 1:51 pm

marco_polo wrote:
Sat Aug 11, 2018 1:41 pm
stag74 wrote:
Sat Aug 11, 2018 6:09 am
Going square could put my current rear 245"s on the front being 50% worn, and a fresh pair on the rear.
If you really wanted to re-use the worn ones, I'd put them on the back personally - let a good pair of front tyres dry the road for the dodgy rears.
Please listen to MP and ALWAYS put your best tyres on the front. Your front axle takes care of the most important things - braking and turning. There should be no compromises there.
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stag74
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Re: New wheels

Post by stag74 » Sat Aug 11, 2018 3:06 pm

Sounds like the putting the 245 supersports on the front is a bad idea.
I'm so surprised the wear on all tyres is the same after 15k miles.
The wear on my last e91 was always much more biased to the rear.
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jan_tekin
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Re: New wheels

Post by jan_tekin » Sat Aug 11, 2018 5:56 pm

Currently running standard MPSS on my BBS CH-Rs only because the fronts are pretty new although the do look a little stretched.
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pem10
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Re: New wheels

Post by pem10 » Sat Aug 11, 2018 7:08 pm

Jahjaman wrote:
Sat Aug 11, 2018 1:51 pm
marco_polo wrote:
Sat Aug 11, 2018 1:41 pm
stag74 wrote:
Sat Aug 11, 2018 6:09 am
Going square could put my current rear 245"s on the front being 50% worn, and a fresh pair on the rear.
If you really wanted to re-use the worn ones, I'd put them on the back personally - let a good pair of front tyres dry the road for the dodgy rears.
Please listen to MP and ALWAYS put your best tyres on the front. Your front axle takes care of the most important things - braking and turning. There should be no compromises there.
That does make very good sense but I've always been under the impression that you put your newer tyres on the rear. Reason being that for the average driver, ie, most of us gentle understeer is easier to control than sudden snap oversteer.
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wobs
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Re: New wheels

Post by wobs » Sat Aug 11, 2018 9:31 pm

Just realised that I should have started this post in tyres/wheels and my post has been moved there...................Sorry :oops:

So now having spent a while going through tyres/wheels it's answered a lot of the questions I had except a couple I couldn't find although probably the answers in there somewhere.

Anyway, how does running 245 square affect handling? Any or much impact on understeer or tramlining?
I've not done the F8x arm mod but do have LSD.
2018 F20 M140i auto PPF (mine)
2016 F20 M140i auto (hers)

stag74
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Re: New wheels

Post by stag74 » Sun Aug 12, 2018 2:36 pm

pem10 wrote:
Sat Aug 11, 2018 7:08 pm
Jahjaman wrote:
Sat Aug 11, 2018 1:51 pm
marco_polo wrote:
Sat Aug 11, 2018 1:41 pm

If you really wanted to re-use the worn ones, I'd put them on the back personally - let a good pair of front tyres dry the road for the dodgy rears.
Please listen to MP and ALWAYS put your best tyres on the front. Your front axle takes care of the most important things - braking and turning. There should be no compromises there.
That does make very good sense but I've always been under the impression that you put your newer tyres on the rear. Reason being that for the average driver, ie, most of us gentle understeer is easier to control than sudden snap oversteer.
Likewise, as generally a rear wheel drive car wears the rears faster than the front, have always swapped partly worn rears to front on a square setup to equalise wear and maximise rear grip/traction.
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