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Main : Mechanical : Suspension Wheel Offset and Backspace Diagram

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Wheel Offset and Backspace Diagram
Wheel Offset and Backspace DiagramPopular
SubmitterddgonzalMore Photos from ddgonzal   Last Update2003/3/17 19:22    Tell a friendTell a friend
Hits11882  Comments8    0.00 (0 votes)0.00 (0 votes)
Note that Front Wheel Drive wheels generally have more "positive" offset.

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Poster Thread
ddgonzal
Posted: 2003/9/1 19:19  Updated: 2003/9/1 19:19
Moderator
Joined: 2001/5/3
From: Hawaii, USA
Posts: 30815
 Re: Wheel Offset and Backspace Diagram
So zero offset would be where the mounting flange is right down the center of the wheel. For example:

6" wide wheel. Mounting flange is 3" from the back .

15mm offset would be where the mounting flange is 1/2 width + 15 mm from the backside of the wheel.

Quote:
14x6 rims need about 15mm of offset to fit on the front when you are using stanza lower arms. You can get away with 0 offset (like 510s) for the rear @ 6inch width.

reference: dattodude

Poster Thread
L18_B110
Posted: 2003/9/2 2:54  Updated: 2003/9/2 2:54
No life (a.k.a. DattoMaster)
Joined: 2002/8/6
From: Brisbane, Australia
Posts: 3788
 Re: Wheel Offset and Backspace Diagram
almost dd! except that the total width of the average 6" cast alloy rim will be about 7", so you need to measure the total width of the wheel to get an accurate offset measurement - you can't use the nominal width of the wheel as you've described.

Poster Thread
tsillay
Posted: 2003/9/2 3:14  Updated: 2003/9/2 3:14
Home away from home
Joined: 2002/11/26
From: Wellington New Zealand
Posts: 468
 Re: Wheel Offset and Backspace Diagram
noono, you're confusing backspacing with offset.
offset is the difference between the centreline of the rim and the mounting flange, wheel width wont change this.

I'm not convinced that putting FWD rims on a RWD car is good either. Yep, they'll fit under the guards, but it stuffs up the scrub radius in the front...

Poster Thread
L18_B110
Posted: 2003/9/2 4:19  Updated: 2003/9/2 4:19
No life (a.k.a. DattoMaster)
Joined: 2002/8/6
From: Brisbane, Australia
Posts: 3788
 Re: Wheel Offset and Backspace Diagram
no I'm not. the only way to measure the offset is as dd described, to measure backspace and overall wheel width (not the specified rim width).

Poster Thread
tsillay
Posted: 2003/9/2 4:34  Updated: 2003/9/2 4:34
Home away from home
Joined: 2002/11/26
From: Wellington New Zealand
Posts: 468
 Re: Wheel Offset and Backspace Diagram
d'accord

Poster Thread
ddgonzal
Posted: 2003/9/2 4:55  Updated: 2003/9/2 4:55
Moderator
Joined: 2001/5/3
From: Hawaii, USA
Posts: 30815
 Re: Wheel Offset and Backspace Diagram
Ah, I see it now in the picture:

- "Rim Width", which is the advertised (like maybe a 6 inch wheel)
- "Overall Rim Width", which includes the tire bead/flange and might add 1/2 inch on each side

It would be easier I suppose to measure the overall width, then take 1/2 that as the "Zero Offset" position.

Poster Thread
dattodude
Posted: 2003/9/2 6:14  Updated: 2003/9/2 6:14
No life (a.k.a. DattoMaster)
Joined: 1998/12/6
From: Sydney, Australia
Posts: 5807
 Re: Wheel Offset and Backspace Diagram
That was pretty much what I was getting at. On a standard 1200 (or one with a ute diff, the 15mm offset (5.5inch wide) wheels fit nicely under the front guards, but look anaemic on the rear. So This is why a 6 or 7 inch rim is a nicer fit. 7 inch rims on the rear with 205 tires will need the right offset and the guards lipped, to make them fit, especially with 60+ series tires on 14inch. For 15 inch wheels, expect to go to 50 series. This is also good for matching the silvia wheel diameter, to match the gearbox speedo drive and the 1200 speedo. Giving a close speedo reading.

BTW:

Pintara 14inch wheels don't fit when the 180B strut/commodore calipers and Verada discs are used. I had to get the offset changed to make the caliper clear the welds that hold the centre into the wheel. That was plenty of work, so I recommend either 14 inch mags (with good caliper clearance) or 15 inch wheels to suit this conversion.

Chris

Poster Thread
matbighat
Posted: 2003/9/2 8:02  Updated: 2003/9/2 8:02
No life (a.k.a. DattoMaster)
Joined: 2001/1/30
From: ダットサン ランド
Posts: 2978
 Re: Wheel Offset and Backspace Diagram
One thing you can always count on for car people to disagree or confuse each other about and that is wheel offset termninology.