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offset
madteg - 22/2/12 at 08:00 PM

How do you measure what offset a wheel is. Or does it say it on the wheel

flak monkey - 22/2/12 at 08:03 PM

Should be cast into the back.

Otherwise, take a straight edge, lay it across the back of the rim, measure to the mounting flange and subtract 6mm.

Take the half the width of the rim, subtract your measurement and see what you get. If the result is -ve then the offset is +ve by that amount. I.e the mounting face is closer to the outside of the wheel than the inside.

[Edited on 22/2/12 by flak monkey]

loggyboy - 22/2/12 at 08:22 PM

Flak - where do you get the 6mm from??

flak monkey - 22/2/12 at 08:26 PM

The offset is normally measured from the inside of the rim lip/bead rather than the very outer edge of the wheel.

Measure the width of a rim to the outer edges and it will be about 1/2" wider than the stated width, so a 7" rim will measure 7.5" normally.

So if you take the nominal rim width and measure the offset as above you need to take half that additional width into account.

However if you work on the rim width being the outside measurement, then ignore the above

v8kid - 22/2/12 at 08:32 PM

Explains it in pics and you can type in your own details to get the answer

http://www.rimsntires.com/specs.jsp

Cheers!

loggyboy - 22/2/12 at 08:41 PM

quote:
Originally posted by flak monkey
The offset is normally measured from the inside of the rim lip/bead rather than the very outer edge of the wheel.

Measure the width of a rim to the outer edges and it will be about 1/2" wider than the stated width, so a 7" rim will measure 7.5" normally.

So if you take the nominal rim width and measure the offset as above you need to take half that additional width into account.

However if you work on the rim width being the outside measurement, then ignore the above


But the offset is from the centreline of the wheel, and the lip/beads are largely the same on both sides, so the 6mm can be discounted if you measure the rim width rather than using the stated one. Off set will still be the same.

flak monkey - 22/2/12 at 08:55 PM

Thats what I said. You only need to take the 6mm off if you use the stated rim width and take your measurement from the outside of the lip...

loggyboy - 22/2/12 at 08:58 PM

6mm seems a bit finger in the wind tho!

flak monkey - 22/2/12 at 09:03 PM

Measure it and see....normally works out right within a couple of mm.