Wheel offset. Who has 18/9's??
#1
Rennlist Member
Thread Starter
Join Date: Nov 2002
Location: Between rock and hard place
Posts: 3,802
Received 1,205 Likes
on
657 Posts
![Question](https://rennlist.com/forums/images/icons/icon5.gif)
What offset are people running with 18/9's??
And just so I know, the stock offset for the rear is ok, or what would be ideal?
I want to stick with 18/11.
Thanks,
And just so I know, the stock offset for the rear is ok, or what would be ideal?
I want to stick with 18/11.
Thanks,
#2
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
The Cup car BBS racing wheel is 9x18 offset 46, which places its outer edge relative to the fender at the same place as the stock 8.5x18 offset 40 wheel. There may be slightly more tire rubbing at full lock against the brake duct since the additional wheel width is biased toward the inside.
#6
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Any more information on 18/9 offsets? The stock offset it 40, and the stock wheel/tire combo tends to rub a bit at full lock. Going to a bigger offset, e.g., 45mm as noted above, just makes matters worse.
Wouldn't a 35mm offset work better?
Perhaps the rubbing at full lock is no limited to the brake ducts, and accordingly, no big deal?
Wouldn't a 35mm offset work better?
Perhaps the rubbing at full lock is no limited to the brake ducts, and accordingly, no big deal?
#7
Addict
Rennlist Member
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
The 18x9 ET 46 is a perfect fit on any 996/986.
If you run rotated camber plates, or Manthey camber plates, then you get another 1/2" of clearance for wheels/tires. So you can run 18x9 ET35, 18x9.5 ET40, even a 18x10 ET42 with rolled front fenders and 3.5 degrees camber.
My 275 RA-1 is 10.94" wide, and we are talking about way narrower wheels than tires.
If you run rotated camber plates, or Manthey camber plates, then you get another 1/2" of clearance for wheels/tires. So you can run 18x9 ET35, 18x9.5 ET40, even a 18x10 ET42 with rolled front fenders and 3.5 degrees camber.
My 275 RA-1 is 10.94" wide, and we are talking about way narrower wheels than tires.
Trending Topics
#9
Addict
Rennlist Member
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Originally Posted by frayed
NJ, so an 18x9 with a range of factory-ish offsets (39-41mm) should work fine, irrespective of rotated/non-rotated camber plates, correct?
Thanks man.
Thanks man.
The wheel will be 7mm toward the outside. The stock wheel was designed to allow clearance on the tall 235/40R18 tire on all the camber ranges provided by the adjustment on the strut top.
You will need to run the strut fully inside (negative camber) if the camber plates are not rotated, and that gives you -1.5 degrees camber at most without shims.
If you want more negative camber then you can use control arm shims (I don't recommend them, because the move the tire to the front and they rub really bad), expand the three camber adjustment holes (the best path so far), rotate camber plates (reduction on caster, not recommended either), or custom camber plates (the path I took).
#10
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Ahh, thank you Master. ![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
I'm at -1.5 right now with maxed camber, but will go with more camber (obviously) for track work. I decided against shims for the reason you stated, but didn't realize that there was an appreciable loss in caster from the rotated strut hats.
"Expansion" of the camber holes via the dremel technique sounds unsavory though. Eeks.
![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
I'm at -1.5 right now with maxed camber, but will go with more camber (obviously) for track work. I decided against shims for the reason you stated, but didn't realize that there was an appreciable loss in caster from the rotated strut hats.
"Expansion" of the camber holes via the dremel technique sounds unsavory though. Eeks.
#11
Addict
Rennlist Member
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Forgot to mention. I don't think you will be able to run 265 MPSC with a 9" ET40 wheel without expanding the camber holes or rotating the camber plates. Reducing offset will increase track (good) but reduce the clearance for wider tires (not good).
I prefer to run a 265 on a 18x9 ET46 than a 245 on a 18x9ET40.
If your tire choices are 245 or less for the front, you're ok with a 18x9ET40. With the advantadge of increased track by 14mm and a bit wider contact patch due to the wider wheel.
If you want to run 315/335 tires rear you need to stay on 63mm offset or higher. If you plan on running 305 or smaller tires, then the 11x18 ET59 will be a better choice.
I prefer to run a 265 on a 18x9 ET46 than a 245 on a 18x9ET40.
If your tire choices are 245 or less for the front, you're ok with a 18x9ET40. With the advantadge of increased track by 14mm and a bit wider contact patch due to the wider wheel.
If you want to run 315/335 tires rear you need to stay on 63mm offset or higher. If you plan on running 305 or smaller tires, then the 11x18 ET59 will be a better choice.