Exact Fitment Help

[AlexM.]

Hey I'm looking to get new wheels and I want my fitment to be ON POINT this time. Tire and wheel calculators online don't take your ride height into consideration so I don't want to fully rely on this. I'm lowered on my coilovers to the max and I want to measure everything so that everything is where I want it to be without rubbing. Can anyone point me in the right direction?

Most of us already know what fits without rubbing on widths from 7.5 - 8.5 but a lot of questions pop up when it comes to 9+ widths.

I understand how to see how far it will stick out from the fender but how inner clearance? Clearance from wheel well ceiling? Strut housing? well wall? fender? fender while your wheel is turned?

And then there's camber. I heard that for every degree of camber you have you get 5mm more wheel clearance (but from where??) And for those of you that don't know, negative camber is NOT the enemy. Toe is.

I want us to have a certain wheel dimension in mind that we'd like to fit and be able to measure or figure out whether or not it will fit so that we aren't necessarily limited to the mainstream dimensions. I know there are those of us out there that are wanting to push 10 inch wide wheels!! For me, I think 19x9.5 +22 will be fine, but how can I be sure without measuring??

Any input is helpful and if this can be made into a sticky after enough information has been provided that would be great.
I put this thread here because most people check this sub forum more than the wheel/suspension one.

[downedzephyr]

9.5 +22? that's extremely aggressive. i would expect lots of rubbing simply because 8.5 +35 sits pretty flush. if you're gonna run 9.5, i would say look into a +42 offset, or +35 with stretched tires. then again, i'm not exactly a wheel expert

[Blackmobile]

go to a shop and have everything measured. people out there with 9+ wide wheels are either totally flush or sticking out. we can't run really agressive setups, our cars are not designed for it. 8.5 +35 is totally flush like said above. if you're slammed, i don't even think you could get away with that setup without some camber and tire stretching. at 9.5 +22 you're gonna have like an inch of wheel sticking out

[mrodrig2]

The only way to know is to try it out with the wheel & tire or you can make a cardboard template of the same size and see where it hits when you turn it within the wheel well.

Regarding camber giving clearance, they are probably referring to clearance to the wheel arch, but on the other hand you may be losing interior clearance. There's no set calculation X degrees of camber yields Y mm of clearance. Maybe you can use that as a very rough idea, but its different for every car because wheel shrouds, fenders, wheel well shape, suspension components, etc aren't the same on every car.

[AlexM.]

go to a shop and have everything measured. people out there with 9+ wide wheels are either totally flush or sticking out. we can't run really agressive setups, our cars are not designed for it. 8.5 +35 is totally flush like said above. if you're slammed, i don't even think you could get away with that setup without some camber and tire stretching. at 9.5 +22 you're gonna have like an inch of wheel sticking out

Aggressive for us is not aggressive for other cars and vice versa. To my understanding you can make anything (not literally) fit with enough camber and stretch.

9.5 +22? that's extremely aggressive. i would expect lots of rubbing simply because 8.5 +35 sits pretty flush. if you're gonna run 9.5, i would say look into a +42 offset, or +35 with stretched tires. then again, i'm not exactly a wheel expert

Oilsink is running 8.5 +15 front and 9.5 + 15 rear with camber, bigger tires than me and no rubbing
8.5+35 is not flush from first hand experience. 8.5+27 is flush and coils are on lowest settings. No rubbing but my tires are small also.

Regarding camber giving clearance, they are probably referring to clearance to the wheel arch, but on the other hand you may be losing interior clearance. There's no set calculation X degrees of camber yields Y mm of clearance. Maybe you can use that as a very rough idea, but its different for every car because wheel shrouds, fenders, wheel well shape, suspension components, etc aren't the same on every car.

Thanks. I know every car is different but everyone else must have figured it out some way other than PURE trial and error.

[downedzephyr]

9.5 +22? that's extremely aggressive. i would expect lots of rubbing simply because 8.5 +35 sits pretty flush. if you're gonna run 9.5, i would say look into a +42 offset, or +35 with stretched tires. then again, i'm not exactly a wheel expert

Oilsink is running 8.5 +15 front and 9.5 + 15 rear with camber, bigger tires than me and no rubbing
8.5+35 is not flush from first hand experience. 8.5+27 is flush and coils are on lowest settings. No rubbing but my tires are small also.

I don't know how many times i've said this in your threads, Oilsink's fenders are rolled and pulled. So unless you plan on pulling your fenders, stop citing him as justification, because 9.5 +22 with stock isn't going to cut it.

[AlexM.]

I don't know how many times i've said this in your threads, Oilsink's fenders are rolled and pulled. So unless you plan on pulling your fenders, stop citing him as justification, because 9.5 +22 with stock isn't going to cut it.

I know they're rolled and pulled and sorry that it's been bugging you if I haven't said that he's pulled his fenders. But +22 is not the same thing as +15. Why are you assuming that +22 without pulling fenders is going to be an issue? +7mm is a big difference. I don't know if it's big ENOUGH of a difference or not hence I wouldn't fully state that I'm going to rub or not rub for sure. Statements like yours are helpful but could you tell me why it's not going to fit?

[downedzephyr]

the 5mm difference in offset between 8.5+27 wheels you have now and 9.5+22 wheels you propose is noteworthy; couple that with an extra inch worth of wheel/tire in the back, and you see a change of 17.7mm. how did i get that number? since the wheel is 1 inch wider, and 1 inch = exactly 2.54 cm, you will be 1.27cm wider on each side of the hub. 1.27cm = 12.7mm + 5mm from the difference in offset = 17.7mm.

go measure with your wheels now and see if you have almost 2cm in extra clearance between your wheel and fender. you'd have to account for camber as well, since i'm assuming you will be running some camber and tire stretch. certainly if you're slammed i would expect you to rub, if you raise your ride height a bit i could see this working. as a note, i'm not quite sure that i calculated this right, so if someone could double check that for me it would be great.

[alphapig]

Stance fitment didn't originate from math

Get some wide azz wheels and make them fit!

[downedzephyr]

Stance fitment didn't originate from math

Get some wide azz wheels and make them fit!

yeah, but he wanted more specific reasons, so i gave them to him