40 series tire?? Anyone running it??

[F80Santos]

Hey guys I'm currently runing a 255 40 265 40 set up on my volks I was curious as to why most guys run 35s ?? I don't see many 40s on here pic of how it sits below
[IMG][/IMG]

[E92Roni]

Looks amazing, I ordered 275/40/18 squared yesterday. I think the meaty tire look goes well with these cars.

[RugbyBro]

265/40r18 and 275/40r18. I wish 285/40 was a more popular/available option

[D_SheerDrivingPleasure]

40s are terrific, especially on NY metro roads.

Is the big "rim" fad finally ending!??

[N1rve]

Originally Posted by F80Santos

Hey guys I'm currently runing a 255 40 265 40 set up on my volks I was curious as to why most guys run 35s ?? I don't see many 40s on here pic of how it sits below
[IMG][/IMG]

35 is the stock ratio and mostly because a oversized tire throws off the speedometer. By going with a 40, the diameter goes up 3.8%. Your speedometer will also read about 2 MPH slower, if you're at 60 MPH your true speed will be like 62 MPH.

If you went 265/35 R19, the diameter increase is only 1.2% and the speed different at 60 MPH is like less than 1 MPH.

[humk721]

I run a front tire size of 255/40r18 on my TEs. In hindsight, I would go 265/40 on my next set of tires. I like the 40 series sidewall because it accounts for the diameter decrease when going from 19s to 18s. I could be wrong but I believe most of the track guys don't run 40 series tires because typically that results in excessive sidewall deflection

[D_SheerDrivingPleasure]

If you disable TC then you don't need to worry about tire diameter unless your concerned with speedometer accuracy.

I'm always TC off but only because it allows me to defeat the rev match.

[ALB33]

245/40s in the front with 20mm front spacers

[N1rve]

Originally Posted by humk721

I run a front tire size of 255/40r18 on my TEs. In hindsight, I would go 265/40 on my next set of tires. I like the 40 series sidewall because it accounts for the diameter decrease when going from 19s to 18s. I could be wrong but I believe most of the track guys don't run 40 series tires because typically that results in excessive sidewall deflection

I believe you are correct. Stock 18 size was 255 40 R18 and 275 40 R18. 19 is 255 35 R19 and 275 35 R19.

[dms-01]

Mainly because a 40 series tire has a tall sidewall(19 or 20s)which isn't ideal when going for looks and internet clout. On an 18" rim have at it.

[E92Roni]

Swapped out 19 inch TE's with a 30 wall tire for a 18 inch TE's with a 40 wall tire. Stock height. Like the 18s with a big sidewall better

[zzang]

Originally Posted by E92Roni

Swapped out 19 inch TE's with a 30 wall tire for a 18 inch TE's with a 40 wall tire. Stock height. Like the 18s with a big sidewall better

Hi, is this an 18x10.5 with 275/40/18? And what offset? Thank you

[M3SQRD]

I’m running A052 265/40-18 F and 295/35-18 R on 18x9.5et22 and 18x11et44

[m3rman]

Can 285/40r18 fit on OEM 10” rear wheels on stock suspension?

[M3SQRD]

Originally Posted by m3rman

Can 285/40r18 fit on OEM 10” rear wheels on stock suspension?

285/40-18 isn’t much larger in diameter than the stock 275/40-18. You should try and match the front with the same diameter as the rear. However, there are no max (MPSS or MPS4S) or extreme performance tires offered in 285/40-18.

The 285 tire width is the ideal max width for a 10” wide wheel. Anything wider in the same tire category will not perform better than the 285. There are plenty of wheel width vs. tire width test comparisons. Stuffing a wider tire on a narrow rim doesn’t increase grip and reduce lap times. Here’s one such comparison test:
https://grassrootsmotorsports.com/ar...always-better/

[m3rman]

Originally Posted by M3SQRD

285/40-18 isn’t much larger in diameter than the stock 275/40-18. You should try and match the front with the same diameter as the rear. However, there are no max (MPSS or MPS4S) or extreme performance tires offered in 285/40-18.

The 285 tire width is the ideal max width for a 10” wide wheel. Anything wider in the same tire category will not perform better than the 285. There are plenty of wheel width vs. tire width test comparisons. Stuffing a wider tire on a narrow rim doesn’t increase grip and reduce lap times. Here’s one such comparison test:
https://grassrootsmotorsports.com/ar...always-better/

Thanks for the response!! The 285/40r18 is only offered by Michelin PS4S and they’re $430 each! But at least they’re available finally. I’ll stick with 285 max for rear.

[M3SQRD]

Originally Posted by m3rman

Thanks for the response!! The 285/40r18 is only offered by Michelin PS4S and they’re $430 each! But at least they’re available finally. I’ll stick with 285 max for rear.

I checked Tire Rack and they only had two UHP tires in 285/40-18. Typically Tire Rack would show they are available but out of stock.

[m3rman]

Originally Posted by M3SQRD

I checked Tire Rack and they only had two UHP tires in 285/40-18. Typically Tire Rack would show they are available but out of stock.

I just ordered them from tire rack. Arriving Monday!

[M3SQRD]

Originally Posted by m3rman

I just ordered them from tire rack. Arriving Monday!

What size front tires are you going to use?

[m3rman]

Originally Posted by M3SQRD

What size front tires are you going to use?

265/40