Join Date: Jun 2005
Location: uʍop ǝpısdn
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Okay, here's the definitive guide to all the wheel offset and fitment questions. Here's the real way to figure out whether your wheels will fit!
EDIT: Thanks to NeoVB for this excellent link to help visualize wheel parameters - Wheel / tire size calculator / comparer - RIMS-N-TIRES
These limits are the practical extremes with good alignments. You can buy more fender room with camber or rolling or pulling. In front, you can buy more room with shorter overall tire diameter (<25") The closer you get to these limits, the more likely you will need to stretch a tire to fit the fender side. Drop does not determine what size wheels fit. Put too aggressive a wheel, and one day, you WILL bend your fender when you take the wrong turn with a good bump if you exceed these limits.
Measuring in mm from the face of the hub:
Front fender limit: +65mm
| +65 | Stretch tire and/or roll fender. Need fender liner mod. Do not exceed tire diameter of 25"
| +55 | Fender liner mod if going for a wide or tall tire. Do no exceed tire diameter of 25.2"
Front inner suspension upright limit: -155mm
Need spacer if this number is exceeded. If close, do not use lip weights on wheels
Rear fender limit: +68mm
Rear fender limit w/ shaved lip: +75
Need to stretch tire to a certain degree if very close to these numbers
Rear inner suspension coil lmit: -183mm
Several factors matter as you approach this limit. You may need to limit the amount of suspension travel. You may need to stretch tire. And you cannot run as aggressive camber. I've been able to actually scrub tire well before this limit (@ -175mm) with track cornering loads on the spring and inner forward tub.
Equations to figure out wheel lip placement relative to limits:
Outer lip: (Wheel Width * 25.4) / 2 - Wheel Offset
Inner lip: (Wheel Width * 25.4) / 2 + Wheel Offset
Note: Inner lip is related to backspacing but backspacing takes into consideration the wheel lip thickness, which is usually another 1/2" or 12.7mm.
Front wheel size: 8.5" +45
Fender: 8.5 * 25.4 / 2 - 45 = 62.95 (< 65 - OK)
Suspension: 8.5 * 25.4 / 2 + 45 = 152.95 ( < 155 - OK)
Rear wheel size: 9.5" +55
Fender: 9.5 * 25.4 / 2 - 55 = 65.175 (< 68 - OK)
Suspension: 9.5 * 25.4 / 2 + 55 = 175.65 (< 190 - OK)
It looks like I may need to do some modifications for this, so if I do, what would it be?
Work Emotion XD9 Bronze
17x8.5 +42 215/45/17
17x9.5 +44 225/40/17
(the tires can be changed if a different size would be better)
Ok, so here is what i came up with.
18x8.5 +38 front
18x10 +32 rear
So I calculated.
8.5*25.4/2 - 38 = 69.95 which is great than 65mm. FAIL! lol so i'll need a roll and fender mod and I'll be good.
10*25.4/2 - 32 = 95 which is much greater than 75. Which means I'll need a fairly agressive pull of 20mm. Just under one inch. Am I correct on that? I'll more than likely have to mod the bumper tabs as well. Now this is assuming stock camber correct?
The aggressiveness of the rear versus the non-aggressiveness of the front will make it look like a funny car. Just FYI. The front will fit just fine if you are lowered any amount, because the negative camber will give you extra clearance. I'd run a 225/40r18 up front and a 245/35r18 out back. Depending on how low you are, you can pull your fenders about 10mm and run -3* of camber, and get away with running a 245. I've done it rub-free for about 9 months now.
I had the offsets backwards. The front is +32 rear is +38. I know what you mean about the aggressiveness of the front. I'm getting them used and getting a damn good deal. Thats why I'm doing it that way. They come with 5mm and 10mm spacers as well. So I'll probably run spacers up front to help make them flush. The front tires are 225/40/18 so I'm good there. The rear is 255/40/18. I really don't want to change the tires though. I kind of want an aggressive wheel with a little meat and a decent ride without having to run a 35series tire. I'll have to do some work to get them fitting good but its ok. I"m just curious how much work i'll have to do. I almost wish I went with a more aggressive offset. Somewhere in the low 20's.
As for being lowered. I'm stock - tucked. Depends on how much I want to go lol i'll be on K-Sport air suspension setup. I'm in Iraq right now I already have the kit its just waiting on me to get home to install it.
will the suspension be too soft and the tire/rim would grab?
|Current users viewing this Thread: 1 (0 members and 1 guests)|
|Thread||Thread Starter||Forum||Replies||Last Post|
|WHEEL FITMENT GUIDE: Will these fit? Width, Offset, etc. - ISX50 version||kayotik||Wheels and Tires||676||10-25-2018 12:40 AM|
|Guide: Wheel fitment. Will these wheel fit? What offset do I need?||TeCKis300||Wheels and Tires||627||06-09-2010 10:43 AM|
|*Wheel/Tire Fitment Guide*||LexISpooled||Wheels and Tires||5||02-03-2007 01:02 AM|
|Where did the wheel fitment guide?||vistecs||Wheels and Tires||1||09-26-2002 03:03 PM|