Tyre size help please!

Alloy wheels and tyre discussion
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SteveSmith
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Tyre size help please!

Post by SteveSmith » Wed Jan 10, 2018 10:58 pm

Hi all,

I’m going to need new rear tyres soon and since fitting new wider wheels I’ve wanted to lose some of the stretch!

I’m currently running a 235/35 on the front 9j rim and a 255/35 on the rear 10j rim.

If I went up to a 265 on the rear would you drop down to a 30 profile?

If I went to a 245 front what profile?

Thanks for any advice!
28i M Sport - Alpine White / Canberra Beige, 19" M359’s, H&R’s / Eibachs, BMS Stage 1 - 271bhp, Front Splitter, CF Rear Lip, Alcantara Steering Wheel and Brembo 4 pots

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SteveSmith
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Tyre size help please!

Post by SteveSmith » Wed Jan 10, 2018 11:12 pm

I’m looking at the table below...
13C90845-103F-44B4-8068-B7CF8811DA6F.jpeg
13C90845-103F-44B4-8068-B7CF8811DA6F.jpeg (182.33 KiB) Viewed 199 times
Does this mean I should stick with the 235/35 front and go for 275/30 rear?
28i M Sport - Alpine White / Canberra Beige, 19" M359’s, H&R’s / Eibachs, BMS Stage 1 - 271bhp, Front Splitter, CF Rear Lip, Alcantara Steering Wheel and Brembo 4 pots

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JimsZ
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Tyre size help please!

Post by JimsZ » Wed Jan 10, 2018 11:40 pm

That's a useful table, looks to me you have a number of options.

Have you tried asking the company you bought the wheels off? Worked for me, I went back to the wheel manufacturer directly as well as the supplier, both were helpful.

I'd say they would be a good bet for the answer your looking for.
E89/28i Msport road, Zx10r track...YAY. The count down begins... 4 days in Jerez Oct 18 Almeria done April 2018 : :evil:

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kis
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Tyre size help please!

Post by kis » Fri Jan 12, 2018 1:25 pm

I'd stick with the same profile or increased profile if it were me.

When reading into tyres for my 224's I consulted Mr Wilks and he's very knowledgeable on all things wheel related! Would be a good idea to also look into prices. For that 10mm increase at the rear (in terms of width) you're probably looking at in excess of £50 per tyre (Michelin PS4 / SS)!

For my rear I decided to reduce the width and increase the profile. That's only on 18's! If I were upping to 19's then I'd definitely want a bit more cushion (rather than dropping) your screenshot suggests you'll be going from 255/35/19 --> 265/30/19
Rare '15 Plate E85 Z4 3.0i SMG

BMW Family History (past and present):
1 Series - E87
3 Series - E46 320ci, E46 M3, E90 (x2)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
X5 - E53, E70
X6 - E71
7 Series - E32

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