which tires?

[rgirard413]

what size tires would fit on a 18' rim with 7.5 width and i believe 38mm offset. I have 235/40 now and they eventually rub the rear control arm bad.

 

[jtmcinder]

If 235/40/18 is rubbing on a 2G (by the way, that vertical thing is the knuckle, not a control arm), then I doubt that the offset is +38mm. And we can't help unless we are sure what the offset really is.

- Jtoby

 

[rgirard413]

ok maybe it wasnt that, im not quite sure actully, i cant find any info on the rim or net about the rim to what the offset would be, all i know is that those size tires rub that knuckle. and was just wondering what would be a skinnier tire i could get that would fit on that size rim.

 

[onepimpclipse]

225/40 may fit, but who knows without an offset.

 

[rgirard413]

the offset will effect which tire fits on the rim? i thought that was just the distance it went out from where it intersects with the rotor assembly? I just need to know if something like a 215/40 or 215/35 could physically fit on the rim. If the offset does effect this, my appologizes and i will try and locate this information.

 

[wret]

No, offset does not affect the fit of the tire to the rim. Many people, myself included run 235/40/18's with 38-40mm offset. If you are not sure that your offset is 38mm, then it is likely much more, causing your rubbing problem.

 

[rgirard413]

the only number i could closely find is 42, but im not sure if that is offset cause no where does it indicate as such. Should i be fine with a 215/40 tire?

 

[jtmcinder]

No, that 42 might be it. That's about where I'd expect those tires to start rubbing.

If it is, then a 225/40/18 should be fine. You not only gain 5 mm from the tire's width, but by shrinking the diameter, you gain a bit more.

- Jtoby

 

[rgirard413]

so a 225/40 would be safer to run then a 215/40?

 

[jtmcinder]

Well, no. The smaller the safer, when the only issue is rubbing. But I wouldn't go all the way down to a 215 unless I had to. Heck, if you change the question to being "what should I do?" then the answer is easy and cheap: go to PepBoys and get some spacers.

- Jtoby

 

[wret]

Originally posted by rgirard413
so a 225/40 would be safer to run then a 215/40?

If you could roll at all on the 235’s but had occasional rubbing, it is likely that you have less than the 4mm clearance necessary to allow for tire flex. 225/40/18's should have an additional 9mm of clearance over 235/40/18's (because the profile height is less as well as the width).

 

[rgirard413]

na, it grinded pretty well into the knuckle