Wheel Rim Offset ???
Submitted: Wednesday, Apr 18, 2007 at 20:59
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44473
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Beast of Bodmin
Been doing some homework about wheel offset for an 80 series. Post 27437, is the nearest archive to making sense, however l still dont know how to measure the offset and judge whether a 2nd hand sunraysia will poke the tyre out from under the guards or not.
I'm after a set of 16x8's, tyres are Simex Jungle Trekker 33x11.5-16.
Only one dealer has mentioned offset, out of maybe 8 or so l've called. They have a 'Dynamic' brand rim with 'negative 13mm' offset that should keep the tyre under the guard. But they also have a 'negative 22mm' that might poke out. How do l know which to order without trying them on?
Can wheels be cut and rewelded to a custom offset (Eltham Vic area)
Any info greatly appreciated
Cheers
Bob
Reply By: Peter 2 - Thursday, Apr 19, 2007 at 10:37
Thursday, Apr 19, 2007 at 10:37
Bob
To measure the offset of a rim place the wheel face down on the floor, place a straight edge (piece of timber, steel whatever fits) across the back lip of the rim bead to bead (diameter). Measure from the bottom edge of this to the rear of the rim surface where the hub would sit when the wheel is on the vehicle.
This distance should first be measured on a standard rim to give you a reference point.
A rim with a larger measurement than standard is a positive offset which will move the tyre and rim outwards.
A rim with a smaller measurement than standard is a negative offset and will move the rim inwards.
Changing the off set should be avoided and may be illegal in some cases due to increased loads on wheel bearings, axles and
suspension or might foul
suspension, brakes or bodywork especially when turning.
AnswerID:
234432
Follow Up By: udm - Thursday, Apr 19, 2007 at 15:12
Thursday, Apr 19, 2007 at 15:12
its the other way around -offset pushes the tyre out, while +offset pushes the tyre in...
FollowupID:
495431
Follow Up By: Peter 2 - Monday, Apr 23, 2007 at 13:36
Monday, Apr 23, 2007 at 13:36
Ah yess a senior moment !!
FollowupID:
496372
Reply By: fester2au - Thursday, Apr 19, 2007 at 21:42
Thursday, Apr 19, 2007 at 21:42
I think you'll find the standard Toyota offset for a 16 x 8 factory rim is actually 0. This is what most of the aftermarket alloys are made in. The Nissan uses a 10 positive offset and it's near impossible to get the Nissan offset in an aftermarket wheel.
So if you are going negative 13 or 22 then you are going to move the rim and tyre out by 1/2 to 1 inch.
Offset is classified as the distance in mm from the rear face of the centre of the wheel (ie the mounting face that bolts to your hub) to the centre line of the rim. So a 16 x 8 with 0 offset will have a backspace of roughly 100mm. I say roughly as it is measured technically from bead to bead not rim edge but of course rim edge is easiest to measure and close enough.
In Qld at least you can increase you track by 50mm so a 25 neg rim would still be legal if tyres remained within the guards, not sure about other states.
Gavin
AnswerID:
234606