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      08-12-2014, 10:17 AM   #1
leigh
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best offset for 18x11 rear?

I'm looking to run a wide tire I've seen someone running +34 with a 315 r888 on kw clubsports i would like to do something like this……what offset are you guys running
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      08-12-2014, 10:41 AM   #2
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Quote:
Originally Posted by leigh View Post
I'm looking to run a wide tire I've seen someone running +34 with a 315 r888 on kw clubsports i would like to do something like this……what offset are you guys running
I am running 19x11 ET32 295/30

Pics are here

http://www.m3post.com/forums/showthr...ght=tunerworks

not sure a 315 would work
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      08-12-2014, 10:51 AM   #3
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18x11, offset 18, 285 tires
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      08-12-2014, 11:19 AM   #4
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18x11 et18 - 285/35/18 max tire size (I have fit Michelin PSS in this spec)
18x11 et25 - 295/35/18 max tire size (I have fit BFG G-Force Rivals in this spec - slightly rubs the plastic fender liner protrusion on big dips but doesn't hit anything painted)
18x11 et30 - 305/35/18 max tire size (I have not actually fit tires in this spec - this is an educated guess based on the many fitments that I have tried and what I have observed others fit)

All of the above depends on tire brand (some brands run wider, more square, more rounded, etc.) and ride height / alignment settings.

I have no idea what offset is necessary to fit a 315/30/18. I do know that IND has been pulling fenders to fit that tire size on 10.5" et22 wheels... I think a 11" +34 has a reasonable chance of fitting but you may actually start running into inner clearance issues.
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      08-12-2014, 12:36 PM   #5
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34- offset on a 18x11 will fit a 315 no problem. i just sold these not to long ago.http://www.m3post.com/forums/showthr...ight=forgeline
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      08-14-2014, 02:15 AM   #6
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Quote:
Originally Posted by tintboy View Post
34- offset on a 18x11 will fit a 315 no problem. i just sold these not to long ago.http://www.m3post.com/forums/showthr...ight=forgeline
went for forge line GA3R's with 315's ill post photos once there on
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      08-14-2014, 08:33 AM   #7
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Quote:
Originally Posted by leigh View Post
went for forge line GA3R's with 315's ill post photos once there on
Great choice!Cant wait to see pics!
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      08-14-2014, 09:16 AM   #8
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There's comfortably enough room for the 315/30-18 Hoosier on the back of these cars.

I would look at ET33
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      08-20-2014, 06:53 AM   #9
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here they are 18x11 ET +33 with a 315 R888 there's about 5mm clearance

big thanks to harrop will get more photos this weekend
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      08-20-2014, 06:59 AM   #10
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don't know why its upside down
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      08-20-2014, 12:21 PM   #11
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      08-20-2014, 12:50 PM   #12
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if you want to run wider tire with 19x11 or 18x11 i suggest running a +33 offset. specially if your thinking of going 315...

Im running 19x11 offset +33 on 305 and still have a little space for 315 size.. keep in mind that some tires run wide so you may rub slightly on a 315...
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      08-20-2014, 07:04 PM   #13
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Quote:
Originally Posted by Sean05 View Post
if you want to run wider tire with 19x11 or 18x11 i suggest running a +33 offset. specially if your thinking of going 315...

Im running 19x11 offset +33 on 305 and still have a little space for 315 size.. keep in mind that some tires run wide so you may rub slightly on a 315...
these are 18x11 +33 with a 315 r888 and fit
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      08-20-2014, 07:21 PM   #14
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Quote:
Originally Posted by leigh View Post
these are 18x11 +33 with a 315 r888 and fit
That's a damn tight fit, looking for a track setup myself.
Correct me if I am wrong, is the fender shaving/reprofiling the outer edge off of the tire?
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      08-20-2014, 07:23 PM   #15
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Quote:
Originally Posted by leigh View Post
here they are 18x11 ET +33 with a 315 R888 there's about 5mm clearance

big thanks to harrop will get more photos this weekend
Quote:
Originally Posted by leigh View Post
these are 18x11 +33 with a 315 r888 and fit
Thanks for posting! Where is the 5mm of clearance? At the top? If so that's not where they will rub. They will rub the metal fender at 10:00 on the drivers side (worst case because it's painted and metal and isn't easy to roll), or the plastic intersection of the plastic bumper and rear 1/4 panel. The top of the fender is not an issue at all. Have you road tested them yet? Taken big dips? Checked the spots I described above? I'm not trying to doubt you but just wanted to confirm because the picture you posted doesn't confirm fitment.... If anything the picture makes me think they will rub because the tire is protruding at the 10:00 point. I don't want you to think that you are home free and then nail a bump and damage your fender. I recommend testing fitment on an incline or with a ramp on that one wheel... NOT on the street at speed.

Here are some pictures to show you how the 295/35/18 Rivals fit on a 10.5 et25 wheel. This is the most aggressive wheel and tire I have been able to fit (I also fit the same tire on 11"et25 wheels). My rear camber is -2.0. Any more aggressive offset will cause the tire to rub the painted fender. I'm honestly amazed that they aren't rubbing with my et25 wheels.... There is literally 1mm of clearance at the trouble spots (with 5mm at the top). I tested this set-up on the track and everything worked great; no rubbing on the track. It is rubbing the fender liner where the bumper and fender intersect but that its only happening on big dips and it's the inner plastic that is inconsequential.






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Last edited by slicer; 08-20-2014 at 07:33 PM.
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      08-20-2014, 08:13 PM   #16
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Quote:
Originally Posted by slicer View Post
Thanks for posting! Where is the 5mm of clearance? At the top? If so that's not where they will rub. They will rub the metal fender at 10:00 on the drivers side (worst case because it's painted and metal and isn't easy to roll), or the plastic intersection of the plastic bumper and rear 1/4 panel. The top of the fender is not an issue at all. Have you road tested them yet? Taken big dips? Checked the spots I described above? I'm not trying to doubt you but just wanted to confirm because the picture you posted doesn't confirm fitment.... If anything the picture makes me think they will rub because the tire is protruding at the 10:00 point. I don't want you to think that you are home free and then nail a bump and damage your fender. I recommend testing fitment on an incline or with a ramp on that one wheel... NOT on the street at speed.

Here are some pictures to show you how the 295/35/18 Rivals fit on a 10.5 et25 wheel. This is the most aggressive wheel and tire I have been able to fit (I also fit the same tire on 11"et25 wheels). My rear camber is -2.0. Any more aggressive offset will cause the tire to rub the painted fender. I'm honestly amazed that they aren't rubbing with my et25 wheels.... There is literally 1mm of clearance at the trouble spots (with 5mm at the top). I tested this set-up on the track and everything worked great; no rubbing on the track. It is rubbing the fender liner where the bumper and fender intersect but that its only happening on big dips and it's the inner plastic that is inconsequential.






Tbh i haven't put them on my car yet harrop wanted to test fit them on there car first to see if they fit they told me theres about 5mm at full bump maybe that photo is taken at full bump i don't really know but they didn't want me taking the wheels with out them checking they fit.

the r888 315 isn't that much bigger then the 305 r888 if you look at the specs on tire rack also its only 25.5 inch tall that will help.

I'm picking them up tomorrow so i will check everything and take it for a drive and report back
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      08-20-2014, 08:15 PM   #17
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Quote:
Originally Posted by leigh View Post
Tbh i haven't put them on my car yet harrop wanted to test fit them on there car first to see if they fit they told me theres about 5mm at full bump maybe that photo is taken at full bump i don't really know but they didn't want me taking the wheels with out them checking they fit.

the r888 315 isn't that much bigger then the 305 r888 if you look at the specs on tire rack also its only 25.5 inch tall that will help.

I'm picking them up tomorrow so i will check everything and take it for a drive and report back
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      08-20-2014, 10:06 PM   #18
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Quote:
Originally Posted by cidle323 View Post
That's a damn tight fit, looking for a track setup myself.
Correct me if I am wrong, is the fender shaving/reprofiling the outer edge off of the tire?
no thats just how r888s come
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      08-20-2014, 10:37 PM   #19
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Interesting! Looking forward to your feedback tomorrow. Are your KW at recommend ride hight, running any camber?
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      08-21-2014, 02:30 AM   #20
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Quote:
Originally Posted by cidle323 View Post
Interesting! Looking forward to your feedback tomorrow. Are your KW at recommend ride hight, running any camber?
i don't know what the recommend hight is there all the way up at the back and fronts are as they came.

camber i am but i have no idea how much just a normal amount not to much
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      08-22-2014, 09:25 PM   #21
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Quote:
Originally Posted by slicer View Post
Just got the wheels haven't put them on yet but I wanted to ask you if you think my fronts will fit with the kw club sports there 18x10 ET27 with a 275/35/18 r888 or will I need to change my spring?
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      08-22-2014, 10:17 PM   #22
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Quote:
Originally Posted by leigh
Quote:
Originally Posted by slicer View Post
Just got the wheels haven't put them on yet but I wanted to ask you if you think my fronts will fit with the kw club sports there 18x10 ET27 with a 275/35/18 r888 or will I need to change my spring?
Will definitely need to change spring or add 10mm spacer.
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