Tyre set up question please

[Commando_Rob]

Hi all, I've bought 19" wheels for my 3.0i e85 thats lowered on eibach sports springs would 225/35/19 and 265/30/19 work ok or would I be better going with 255/30/19 for the rears?

The ET are 38 front and 45 rear widths 8.5 & 9.5

Thanks in advanced.

[mr wilks]

I wouldn't envisage any problems with your desired set of tyres on those fitment numbers

[TomK]

Hi all, I've bought 19" wheels for my 3.0i e85 thats lowered on eibach sports springs would 225/35/19 and 265/30/19 work ok or would I be better going with 255/30/19 for the rears?

The ET are 38 front and 45 rear widths 8.5 & 9.5

Thanks in advanced.

If it were me I'd be going for the 255 rear if you're running a 225 front. 265 is rather unnecessary on a car of this power. For some reference a z4m or e46m3 run a 225 front, 255 rear.
But as mr wilks says there is no issue as such running a 265 if you like (the looks ).

[Commando_Rob]

Hi all, I've bought 19" wheels for my 3.0i e85 thats lowered on eibach sports springs would 225/35/19 and 265/30/19 work ok or would I be better going with 255/30/19 for the rears?

The ET are 38 front and 45 rear widths 8.5 & 9.5

Thanks in advanced.

If it were me I'd be going for the 255 rear if you're running a 225 front. 265 is rather unnecessary on a car of this power. For some reference a z4m or e46m3 run a 225 front, 255 rear.
But as mr wilks says there is no issue as such running a 265 if you like (the looks ).

I was originally planning on going 255 30 19 rear, but am worried that on a 9.5 wide wheel it might look over stretched ??

[mr wilks]

Definitely dont go 255-30 on a 9.5j rear.
You will have no problem with 265-30 or 255-35

[Commando_Rob]

ive looked at 255 35 19 but that calculates to a big difference of speedo error etc, where as 265 30 19 is much closer to original. I guess 265 it is then?

[mr wilks]

ive looked at 255 35 19 but that calculates to a big difference of speedo error etc, where as 265 30 19 is much closer to original. I guess 265 it is then?

How do you define "error" what you will most likely find is the speedo becomes more accurate

[Z4C_er]

I'm guessing then a 245/35 R19 on a 9J would give you a similar correctional 'error'?

[Commando_Rob]

[quote=Commando_Rob post_id=<a href="tel:1658728">1658728</a> time=<a href="tel:1560201952">1560201952</a> user_id=29612]
ive looked at <a href="tel:255 35 19">255 35 19</a> but that calculates to a big difference of speedo error etc, where as <a href="tel:265 30 19">265 30 19</a> is much closer to original. I guess 265 it is then?

How do you define "error" what you will most likely find is the speedo becomes more accurate
[/quote]

I put my Z4s original wheel and tyre sizes ( 225 40 18 8j ET 47 / 255 35 18 8.5j ET 50) into a "will they fit" alternative wheel and tyre sizes calculator and the closest to original came out at 225 35 19 and 255 30 19, 235 35 19 & 265 30 19 is also close, like has been advised by you guys 255 30 19 on a 9.5 wheel will be too stretched hence my thinking 265 and 225, so fronts don't run and rears aren't over stretched

I'd be happy with 225 40 19 & 255 35 19 (as has been suggested by TomK) but think these may rub?

Another point why are Z4M oe 18" tyre sizes 225 45 18 / 255 40 18 and non MZ4 225 40 18 / 255 35 18 and not the same.

[David-H]

I put my Z4s original wheel and tyre sizes ( 225 40 18 8j ET 47 / 255 35 18 8.5j ET 50) into a "will they fit" alternative wheel and tyre sizes calculator and the closest to original came out at 225 35 19 and 255 30 19, 235 35 19 & 265 30 19 is also close, like has been advised by you guys 255 30 19 on a 9.5 wheel will be too stretched hence my thinking 265 and 225, so fronts don't run and rears aren't over stretched

I'd be happy with 225 40 19 & 255 35 19 (as has been suggested by TomK) but think these may rub?

The 255/35 19 would give you a much bigger error on your speedo (+4.2%) compared to the 265/30 19 which would be (+1.3%) and, given that speedos are calibrated to read a little higher than actual speed, probably a bit more accurate. Same goes for the fronts - 225/40 would be about +4% compared to +0.7% of the 225/35.