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CSL Tyres

Alloy wheels and tyre discussion
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drummachine
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Post by drummachine » Wed Feb 27, 2019 12:38 pm

Hi everyone

I need to fit some replacement tyres on my CSL's. They are fitted to a Z4MR.

It seems to be suggested 235/35 front and 265/30 rears are the advised sizes? That's what is currently fitted too.

I can get them fitted at work and so far I have been offered....

Goodyear Eagle F1 Assymetric 2 - £550.38 delivered

Michelin Pilot Sport 4S - £640.30 delivered


What are everyone's thoughts on sizes, tyres and where to get them from?

synthedup
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Post by synthedup » Wed Feb 27, 2019 12:44 pm

Sizes are correct and go for the PS4S’s

I run them and they’re great.

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Jembo
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Post by Jembo » Wed Feb 27, 2019 12:59 pm

There’s two sizes

225x40x19 (F) 255x35x19 (R)
or as u mentioned
235x35x19 (F) 265x30x19 (R)

Suggest you look for a fitted price, as I found for example Costco would do the 235 front fitted in MPS4s’ for £310ish (if ur a member) recently.

Then there’s the debate about tyre pressures, as I would suggest running a wider tyre you may need to compute a lower PSI as the weight is distributed over a larger surface area

18” recommended pressures
225=30.458 (30.5)
255=31.908. (32)

Therefore (225/235) x 30.345 = 29.161
235=29.161
(255/265) x 31.908=30.7
265=30.7

If you read a number of posts, quite a few said they had better M handling on a lower pressure which kinda supports this computation
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drummachine
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Post by drummachine » Wed Feb 27, 2019 3:22 pm

Thanks both.

I'm swaying towards Michelin - prices fluctuate massively everywhere i call as usual!

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R60BBA
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Post by R60BBA » Wed Feb 27, 2019 3:50 pm

drummachine wrote: Wed Feb 27, 2019 12:38 pm Hi everyone

I need to fit some replacement tyres on my CSL's. They are fitted to a Z4MR.

It seems to be suggested 235/35 front and 265/30 rears are the advised sizes? That's what is currently fitted too.

I can get them fitted at work and so far I have been offered....

Goodyear Eagle F1 Assymetric 2 - £550.38 delivered

Michelin Pilot Sport 4S - £640.30 delivered


What are everyone's thoughts on sizes, tyres and where to get them from?
Go for the PS4S.

Blackcircles are offering a 10% discount at the moment I believe.
Current: 2002 E46 M3
Current: 2004 R53 Cooper S
Current: 2005 997 Carrera S
Gone: 1998 E31 840Ci Sport
Gone: 2007 Z4 E86 3.0Si Sport
Gone: 2001 Z3 E36/7 2.2i San Remo Individual
Gone: 2015 F21 116d M Sport
Gone: 2012 A3 Sportback 1.2TFSI

drummachine
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Post by drummachine » Wed Feb 27, 2019 4:09 pm

I just came across that actually. £616 delivered for PS4's seems pretty decent!

Gazza51
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Post by Gazza51 » Wed Feb 27, 2019 9:44 pm

I’d go for PS4S
Current - Z4 MC, M3 CSL, S54 Z3MR, Z1.

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srhutch
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Post by srhutch » Wed Feb 27, 2019 9:51 pm

Jembo wrote: Wed Feb 27, 2019 12:59 pm There’s two sizes

225x40x19 (F) 255x35x19 (R)
or as u mentioned
235x35x19 (F) 265x30x19 (R)

Suggest you look for a fitted price, as I found for example Costco would do the 235 front fitted in MPS4s’ for £310ish (if ur a member) recently.

Then there’s the debate about tyre pressures, as I would suggest running a wider tyre you may need to compute a lower PSI as the weight is distributed over a larger surface area

18” recommended pressures
225=30.458 (30.5)
255=31.908. (32)

Therefore (225/235) x 30.345 = 29.161
235=29.161
(255/265) x 31.908=30.7
265=30.7

If you read a number of posts, quite a few said they had better M handling on a lower pressure which kinda supports this computation
What’s the logic in you calcs there Jem?
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Jembo
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Post by Jembo » Thu Feb 28, 2019 10:13 am

srhutch wrote: Wed Feb 27, 2019 9:51 pm
Jembo wrote: Wed Feb 27, 2019 12:59 pm There’s two sizes

225x40x19 (F) 255x35x19 (R)
or as u mentioned
235x35x19 (F) 265x30x19 (R)

Suggest you look for a fitted price, as I found for example Costco would do the 235 front fitted in MPS4s’ for £310ish (if ur a member) recently.

Then there’s the debate about tyre pressures, as I would suggest running a wider tyre you may need to compute a lower PSI as the weight is distributed over a larger surface area

18” recommended pressures
225=30.458 (30.5)
255=31.908. (32)

Therefore (225/235) x 30.345 = 29.161
235=29.161
(255/265) x 31.908=30.7
265=30.7

If you read a number of posts, quite a few said they had better M handling on a lower pressure which kinda supports this computation
What’s the logic in you calcs there Jem?
The wider the tyre, the more vertical weight distributed over a larger surface area, where on cars I’ve owned in the past which have had different tyre sizes on the plate they’ve had different pressures.

Confusingly some have had higher, some lower pressures with wider tyres.

This, coupled with some googled posts where people have found M Zed’s less ‘skippy’ on slightly lower pressures, suggested the pro rata formulae for debate...
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Ex Aug 2005 Maldives Blue 3 litre cruizer, lots of toyz,

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srhutch
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Post by srhutch » Thu Feb 28, 2019 8:33 pm

Your formula then?

Never seen it before hence asking, not sure I agree with the logic though.
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