Will 235/35/19 tyre fit?

mr wilks said:
Many people but really depends on your rim width , offset & suspension :thumbsup:
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Thanks Andy,

Its a 8j front and I believe ET38.

They're M3 spec CSL size wheels.

Running coilovers lowers about 10mm I recon
 
synthedup said:
mr wilks said:
Many people but really depends on your rim width , offset & suspension :thumbsup:
Click to expand...


Thanks Andy,

Its a 8j front and I believe ET38.

They're M3 spec CSL size wheels.

Running coilovers lowers about 10mm I recon
Click to expand...

I wouldn't but that's not to say 235 won't fit a 8j rim
 
mr wilks said:
synthedup said:
mr wilks said:
Many people but really depends on your rim width , offset & suspension :thumbsup:
Click to expand...


Thanks Andy,

Its a 8j front and I believe ET38.




They're M3 spec CSL size wheels.

Running coilovers lowers about 10mm I recon
Click to expand...

I wouldn't but that's not to say 235 won't fit a 8j rim
Click to expand...


Just checked it's a 8.5j

Does that make a difference? :)
 
Yep it does make a difference , 235 would be fine on a 8.5j rim but lowered with the et38 offset ? Borderline chaffing at certain times :cry:
You need to give a real close look at how the tyre sits now when lock to lock , can you get fingers over the outer edge when the wheel is turned towards the outer arch ?
 
245/35 here, no dramas at all. Not sure if the M fitment would be different to the non M?
 
Thanks for the advice guys, sounds like i'm best sticking with 225's on the front.

Once member did say in a post he was going to 235 but didn't reply to my private message asking if he did go ahead. disappointing.

Thanks again.
 
I've tried 235 and had to go back to 225 on a standard rim lowered on B12 suspension. Still rubbed even after I removed the 10mm spacers. The 235 now resides on our 330 e91 and has made for a superbly grippy front end.
 
Vanne said:
245/35 here, no dramas at all. Not sure if the M fitment would be different to the non M?
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Shouldn't be. How much -ve camber for 245/35 up front though? [EDIT - ignore, I read "245/40" for some reason!].

Mini-bump, sorry OP - turns out the screw in my rear right is too close to the sidewall for a repair so I'm tyre shopping again. :cry:
 
I run Michelin Pilot SuperSport 235/35-19 & 265/35-19.

Fits perfectly - no wonder as its the closest to the diameter of original wheels.

(Z4M).

:)
 
Argenta said:
I run Michelin Pilot SuperSport 235/35-19 & 265/35-19.

Fits perfectly - no wonder as its the closest to the diameter of original wheels.

(Z4M).

:)
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How did you come to that conclusion? 235/35/19 and 265/35/19 is 647/668mm, which is about the biggest front vs rear diameter difference achievable with common Z4M tyre fitments. It is not close to stock (660/661mm).

225/40/19 and 255/35/19 should be the closest, although it's difficult to account for different tyres and rim widths.
 
MrPT said:
Argenta said:
I run Michelin Pilot SuperSport 235/35-19 & 265/35-19.

Fits perfectly - no wonder as its the closest to the diameter of original wheels.

(Z4M).

:)
Click to expand...



225/40/19 and 255/35/19 should be the closest, although it's difficult to account for different tyres and rim widths.
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M3 19inch rubber numbers i believe :thumbsup:
 
Diameter wise (but with 235/265 width) they ARE the closest option to std Z4M wheels - sorry mate! :)

235/35-19 & 265/35-19.

However to answer the original question - yes they fit, depending on ET.
 
Argenta said:
Diameter wise (but with 235/265 width) they ARE the closest option to std Z4M wheels - sorry mate! :)
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Oh, I see what you mean - if you limit yourself to 235/265, then they're the closest. Fair enough.

Found this on the Renntech forum. Porsche would seem to agree with your logic:

From Porsche's Technik Technical Information Book (when the 987 was introduced)...

"A new tire generation with larger rolling circumferences has been developed for the new Boxster/S series to complement the new wheels. The primary aim in developing this new generation has been to achieve a marked improvement in the tires’ performance, thereby lending the Boxster an even sportier character. The tire circumference has been increased by 2.5% on the front axle and 5% on the rear axle. The larger rolling circumference increases the side wall height/tire width ratio in comparison with the previous Boxster (986) model to guarantee an appropriate level of comfort despite the larger wheels. At the same time, the tire widths on the rear axle of the new Boxster/S have been increased from the predecessor’s 16" / 225 mm to 17" / 235 mm. In the absence of the predecessor models’ 16/17" basic tires, the new 17/18" summer tires now serve as the comfort oriented tires. They offer high quality, sporty handling combined with good driving comfort. The 19" summer tire replaces the previous 18" tire when the focus is on sportiness and agility. It offers a substantial increase in performance. The new tires have permitted a noticeable increase in the amount of force that can be transmitted both in the longitudinal and transverse direction. This results in a high level of agility and, at the same time, driving safety. A reduction in the braking distance is possible with the new tires, particularly the 19" tires. These improvements are made possible above all by the specially selected rubber compound for the tires and the new tread design."
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It's a quirk they've carried forward to the 981 and its 19"/20" standard fitments. The GTS on stock 20s actually has exactly the same front/rear sidewall heights as 235/35 and 265/35 19s on a Z4M. Just unfair, really...
 
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