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      10-12-2018, 01:14 PM   #1
jns_e85
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Anyone run a 265/40/18 tire on the FRONT of a Z4M?

Just curious to see if anyone has run this size tire on the front of a Z4M before (with modified suspension of course).

A friend of mine has Yokohama AO52s and swears by them for autocross duty. Looking at prices, there is a huge difference between the 265/35/18 that I know will fit over the 265/40/18 size he runs on a 350z. ($325 for the 265/35 and $250 for the 265/40).

FWIW I am on FA 500's lowered about an inch with a butt load of front camber (-3.4 front). Set up is intended for regional autocross duty on a tire limited BSP set up. Intended wheel size is 18x9.5 et 35
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      11-05-2018, 02:53 PM   #2
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Quote:
Originally Posted by jns_e85 View Post
Just curious to see if anyone has run this size tire on the front of a Z4M before (with modified suspension of course).
I ran 245/40/18 RS4s and they rubbed the front fender liner (running 1/2" lower than stock, 2.5 degrees of camber and max caster). There is a good chance the 265/40 will rub even more unless you run stock ride height. I'm going to 265/35/18 Trofeos on the same spec wheels for next year because of this.
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      11-05-2018, 08:26 PM   #3
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Quote:
Originally Posted by jns_e85 View Post
Just curious to see if anyone has run this size tire on the front of a Z4M before (with modified suspension of course).

A friend of mine has Yokohama AO52s and swears by them for autocross duty. Looking at prices, there is a huge difference between the 265/35/18 that I know will fit over the 265/40/18 size he runs on a 350z. ($325 for the 265/35 and $250 for the 265/40).

FWIW I am on FA 500's lowered about an inch with a butt load of front camber (-3.4 front). Set up is intended for regional autocross duty on a tire limited BSP set up. Intended wheel size is 18x9.5 et 35
At that price you might as well just ante up for the purple crack since you're already in BSP.
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      11-05-2018, 09:11 PM   #4
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While I agree, and purple crack is tempting, I'm not sure I'm ready for them ability wise. I haven't maximized the BSP build yet either, and would get a front sway before A7s. Still learning the limits!

Further complicating the matter is BSP isn't a popular class locally to me, so if I want competition it makes more sense (and more cost effective) to run in a tire limited class with the BSP index. Also, running Hoosiers will bump me up a class with the local BMW club, and I would have to compete with guys in stripped out SM equivalent cars
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      11-07-2018, 04:40 AM   #5
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Curious as well
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      03-30-2019, 08:58 AM   #6
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Quote:
Originally Posted by CTMP4me View Post
I ran 245/40/18 RS4s and they rubbed the front fender liner (running 1/2" lower than stock, 2.5 degrees of camber and max caster). There is a good chance the 265/40 will rub even more unless you run stock ride height. I'm going to 265/35/18 Trofeos on the same spec wheels for next year because of this.
Thatís really surprising 245/40 rubbed. What were the wheel specs?
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      04-12-2019, 04:15 PM   #7
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So I decided to go with a 275/35 RE-71R square setup on 18x9.5 et35 Apex SM-10s. I removed the camber shims during test fit before tires were installed, as it was too close for my comfort. Now at -2.8 front via camber plates only and it fits nicely

I believe on a normal application there would be no rubbing under full lock, but since my passenger side fender liner and skid plates have taken quite a beating over the last two autocross seasons (read: broke to all hell), I get a *tinsy* bit of rub on the liner under full lock to the left, which I expect to be remedy with a few strategically placed zip ties. Can't wait to feel all the grip!
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      04-13-2019, 02:23 PM   #8
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Quote:
Originally Posted by jns_e85 View Post
So I decided to go with a 275/35 RE-71R square setup on 18x9.5 et35 Apex SM-10s. I removed the camber shims during test fit before tires were installed, as it was too close for my comfort. Now at -2.8 front via camber plates only and it fits nicely

I believe on a normal application there would be no rubbing under full lock, but since my passenger side fender liner and skid plates have taken quite a beating over the last two autocross seasons (read: broke to all hell), I get a *tinsy* bit of rub on the liner under full lock to the left, which I expect to be remedy with a few strategically placed zip ties. Can't wait to feel all the grip!
Nice post pics!
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      04-21-2019, 06:05 PM   #9
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      04-23-2019, 01:05 PM   #10
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Welp. I lied.

Driving today I found that under a sharp bump I will have a brief tire/fender rub at the top of the front tire. Not enough camber I suspect, so good to know that one will want more than -2.8 in the front to fit 275s. Luckily it is only slight. On the flip slide, ALL THE GRIP

I may roll the fenders in the meantime for the clearance needed, as I am almost positive the misses will kill me for spending another $450 on new camber plates to get even more camber...
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      06-25-2019, 09:16 AM   #11
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Quote:
Originally Posted by jns_e85 View Post
Welp. I lied.

Driving today I found that under a sharp bump I will have a brief tire/fender rub at the top of the front tire. Not enough camber I suspect, so good to know that one will want more than -2.8 in the front to fit 275s. Luckily it is only slight. On the flip slide, ALL THE GRIP

I may roll the fenders in the meantime for the clearance needed, as I am almost positive the misses will kill me for spending another $450 on new camber plates to get even more camber...
Forgot to update this. Took it to a shop and they determined camber was sufficient but my front ride height was too low! After a quick height adjustment, all is good
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      07-01-2019, 10:47 AM   #12
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Quote:
Originally Posted by 3002 tii View Post
Thatís really surprising 245/40 rubbed. What were the wheel specs?
18x9.5 et35 + a 5mm spacer. I didn't have this issue with RE71-R but did with RS4, so it's likely a more square tire shoulder issue as well.
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