When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I realize it's confusing, but Curby's wheels and my wheels actually have the same front spacing, which puts them in the exact same place in relation to the outer flare.
Curby's Wheels: 17x11 3.75" backspace 8.25" front space
My Wheels: 18x12.5 5.25" backspace 8.25" front space
Since wheels are actually 1" wider than advertised, the formula is: (Wheel Width + 1) - backspace = front space
I hope this helps.
Originally Posted by C3Paul
It seams, every car is slightly different with their size and BS wheel choice
This is quite surprising to me. I made the same assumption as Paul.
Neil, in essence, you're saying that the flares are effectively 3 1/4" (rear) and 1 1/4" (front) instead of 4" and 2". -Régis
That is correct, you cannot just add front spacing to your existing wheels based on the advertised size of the flare and have them fit right. You gotta measure a dozen times and buy once.
I realize it's confusing, but Curby's wheels and my wheels actually have the same front spacing, which puts them in the exact same place in relation to the outer flare.
Curby's Wheels: 17x11 3.75" backspace 8.25" front space
My Wheels: 18x12.5 5.25" backspace 8.25" front space
Since wheels are actually 1" wider than advertised, the formula is: (Wheel Width + 1) - backspace = front space
I hope this helps.
Great explanation and can see the logic now!
so, if I was going to order:
18x12 with 5" BS rear (this will give me 0.25" extra room/clearance under the flare)
18x10 with 4.75 BS front
I do not have flares on my car yet, nor to I know what brand Danny's are, but I know he runs 18x12 rear and 18x11 front wheels both with 5.125" backspacing. There does not appear to be any rubbing on his.
so, if I was going to order:
18x12 with 5" BS rear (this will give me 0.25" extra room/clearance under the flare)
18x10 with 4.75 BS front
That should do the trick!?
Yes, I think 18x12 with 5" backspacing is what the maker of the flares will recommend (but verify with him). The 12" wheel works pretty well with a 335 tire.
I do not have flares on my car yet, nor to I know what brand Danny's are, but I know he runs 18x12 rear and 18x11 front wheels both with 5.125" backspacing. There does not appear to be any rubbing on his.
I know several guys are running 11's in the front. All I can tell you is that it won't work on my car with my flares and stock suspension config/sway bar. I mocked up an 18x11 5.125 BS and there was interference with the outer flare as well as the sway bar and inner wheelhouse.
I do not have flares on my car yet, nor to I know what brand Danny's are, but I know he runs 18x12 rear and 18x11 front wheels both with 5.125" backspacing. There does not appear to be any rubbing on his.
Kubs, I have seen videos of his car doing solo events. I have not figured out the large front back spacing unless he has sub 25 inch tires. I have 4.5 front bs and I have to limit my front tire diameter to less than 26.5 inches because on lock to lock the tire sidewall rubs against the frame rails. My 275/40 fronts are 25.7 inches My Hoosier R7 295 width are only 25.2 diameter.
Ground clearance becomes a problem and that is why I went to front coil overs
I know several guys are running 11's in the front. All I can tell you is that it won't work on my car with my flares and stock suspension config/sway bar. I mocked up an 18x11 5.125 BS and there was interference with the outer flare as well as the sway bar and inner wheelhouse.
Originally Posted by gkull
Kubs, I have seen videos of his car doing solo events. I have not figured out the large front back spacing unless he has sub 25 inch tires. I have 4.5 front bs and I have to limit my front tire diameter to less than 26.5 inches because on lock to lock the tire sidewall rubs against the frame rails. My 275/40 fronts are 25.7 inches My Hoosier R7 295 width are only 25.2 diameter.
Ground clearance becomes a problem and that is why I went to front coil overs
He uses 315/30R18 fronts which are about 25.5" tall. I know he has Van Steel coil overs and JRi shocks, but I think he runs stock configuration parts for the sway bar. I can ask about interference with sway bar or inner wheelhouse.
He uses 315/30R18 fronts which are about 25.5" tall. I know he has Van Steel coil overs and JRi shocks, but I think he runs stock configuration parts for the sway bar. I can ask about interference with sway bar or inner wheelhouse.
I run ~5" backspacing on the front on my car. It does polish the chassis rails and sway bar at full lock, but not that bad. No damage to the tyre at all.
Last edited by Metalhead140; Mar 30, 2016 at 07:30 PM.
I run ~5" backspacing on the front on my car. It does polish the chassis rails and sway bar at full lock, but not that bad. No damage to the tyre at all.
what size wheel and tyre are you using on the front?
would you recomend 4.75BS for extra clearance?
I don't have flares. I run a 17x9.5 on the front, with a 255/50r17. Because it is stretched on the 9.5 wheel, they have almost exactly the same section width (overall width) as a 275 tyre would have on these wheels. If I could buy a 275/45r17 then I would, but I don't believe anyone makes one. I'll consider 275/40r17s next time around, which would fit more easily than the 255/50 (same width, smaller diameter), but I do like the look of the taller sidewall of the 255/50, which is why I would prefer a 275/45 if anyone made one. I expect a 285/40r17 would also fit without much difficulty.
It all depends what you're going for I suppose. 4.75 backspace in my instance would be likely to cause interference or closer fit at the guard, and I'm happy with the compromise. I guess 4.75 backspace might be good though if you had the flares and could add the wheel width on the outside.
Last edited by Metalhead140; Aug 13, 2017 at 04:12 AM.
I know several guys are running 11's in the front. All I can tell you is that it won't work on my car with my flares and stock suspension config/sway bar. I mocked up an 18x11 5.125 BS and there was interference with the outer flare as well as the sway bar and inner wheelhouse.
What size tire? I have 17x11 fronts 4.5" BS 315/35 tires and no rubbing on the outside of the tires with ACI flares. Also stock suspension config, but low.
Last edited by 69autoXr; Mar 31, 2016 at 11:03 AM.
What size tire? I have 17x11 fronts 4.5" BS 315/35 tires and no rubbing on the outside of the tires with ACI flares. Also stock suspension config, but low.
315/30-18. Comparing fitments across different flares from different vendors is apples and oranges. Cars with my brand of flares usually run a 9.5 or 10 inch wheel with a 275 tire. I tried to run something larger, mocked it up and it wasn't going to work. I could've run a 10.5 wheel with a 5.25 backspace but I would have just been stretching the 275 tire and creating inner clearance issues so I went with the 10 inch wheel.
315/30-18. Comparing fitments across different flares from different vendors is apples and oranges. Cars with my brand of flares usually run a 9.5 or 10 inch wheel with a 275 tire. I tried to run something larger, mocked it up and it wasn't going to work. I could've run a 10.5 wheel with a 5.25 backspace but I would have just been stretching the 275 tire and creating inner clearance issues so I went with the 10 inch wheel.
The tread width of a Hoosier 275/35R18 is 10.3". I think you may find you like it more than a 315 stuffed on a 10" wheel.
Edit: I read your quote out of context. I thought YOU were running a 315 on a 10 wheel. My bad.
315/30-18. Comparing fitments across different flares from different vendors is apples and oranges. Cars with my brand of flares usually run a 9.5 or 10 inch wheel with a 275 tire. I tried to run something larger, mocked it up and it wasn't going to work. I could've run a 10.5 wheel with a 5.25 backspace but I would have just been stretching the 275 tire and creating inner clearance issues so I went with the 10 inch wheel.
Sorry, I thought the ACI and "your brand" of flares were similar enough in the front to make a comparison.
I'm still surprised it didn't work, especially with all that backspacing. In your pics it sure looks like there's lots of space.
Sorry, I thought the ACI and "your brand" of flares were similar enough in the front to make a comparison.
I'm still surprised it didn't work, especially with all that backspacing. In your pics it sure looks like there's lots of space.
There's enough room under the fender. The issue is at the lower leading edge of the flare down where a front spoiler would merge with the flare (about the 7 o'clock position driver's side and the 5 o'clock position passenger's side). The tire hits the outer flare there if you go wider than I did. I think a lot of this depends on how the flare gets positioned. I could see if you shifted the flare forward and then trimmed the lower rear corner by the sidepipes you could probably get it to fit. Also, keep in mind I'm running almost 3 degrees negative camber which tilts the top of the tire into the wheelwell.
There's enough room under the fender. The issue is at the lower leading edge of the flare down where a front spoiler would merge with the flare (about the 5 o'clock position). The tire hits the outer flare there if you go wider than I did. I think a lot of this depends on how the flare gets positioned. I could see if you shifted the flare forward and then trimmed the lower rear corner by the sidepipes you could probably get it to fit. Also, keep in mind I'm running almost 3 degrees negative camber which tilts the top of the tire into the wheelwell.
This is really helpful!!
My 1980 comes with different front end than pre 80 cars.
This is why, I will have to cut the flares and customise the bumper.
Now, I have two options:
Change the BS of the front wheel
Go with wider 11" front wheels
Do you think, I Could fit 18x11 with 4.5-4.75 BS and 295-305 wheel and tire combo??
