Outer Limits 4x4 Board

Did the search and the numbers are all over the place. Can someone answer these true or false:

Standard Landcruiser / Nissan rims have a -10mm offset

The widest offset available for after market rims is -25mm (for a GQ I think)

Otherwise, stock 80 series rims have about -58mm (But will they fit a 70 series?)

Essentially, I'm going from 31x10.5 up to 35x12.5in tyres. I don't want the inside edge of the tyre to sit any further in than it does now so it doesn't rub. So I figure I need at least 25mm extra offset to achieve this.

Am I on the right track????

Hi
Yes the wider the better with bigger diameter...Navara offset is wider than what you have, so is the 40 series offset aswell.
Go that way
Andrew

you can get aftermarket rims up to -28mm offset. I doubt the stocker 80 series rims are -58mm, that would have 10.5" tyres sticking out past the stock flares.

on a 7x series, you need 4" lift (2" springs + 2" body) (or significant choppage to the front guards) (or shift the front axle 1" forward +2" lift) minimum to clear 35" tyres on zero offset (4" backspace) 8" wide rims, or you will have big rubbing issues in the front at the rear of the front wheel wells, with the steering turned. the more negative offset you use, the more rubbage issues you will have in that spot particularly, so don't go crazy with the offset, too much has a downside. aim for around 3/4" (about 20mm) to avoid headaches. too wide will also have a negative impact on on-road handling and will accelerate wheel bearing wear.

cheers

Brian

dumbdunce wrote:you can get aftermarket rims up to -28mm offset. I doubt the stocker 80 series rims are -58mm, that would have 10.5" tyres sticking out past the stock flares.

on a 7x series, you need 4" lift (2" springs + 2" body) (or significant choppage to the front guards) (or shift the front axle 1" forward +2" lift) minimum to clear 35" tyres on zero offset (4" backspace) 8" wide rims, or you will have big rubbing issues in the front at the rear of the front wheel wells, with the steering turned. the more negative offset you use, the more rubbage issues you will have in that spot particularly, so don't go crazy with the offset, too much has a downside. aim for around 3/4" (about 20mm) to avoid headaches. too wide will also have a negative impact on on-road handling and will accelerate wheel bearing wear.

cheers

Brian

Thanks for the info... you always seem to have a lot of useful figures to offer!! I have a 60mm body lift and the brochure says the springs will add 75mm. I'm getting the emu dakkar but apparently they settle a little so call it 50mm. With that height, and the extra 50mm lift from tyre diam, I want to give it some stability.

I figure that with the right offset, I can have the inside edge of the wider tyres sit where the inside edge of my 31x10.5's are now. That will reduce rubbing as much as possible and I'll still have 2in wider each side.

If I do go for less offset, what is the chance I'll lose some of my steering lock, or rub on my guards?

V8 Middy wrote:Thanks for the info... you always seem to have a lot of useful figures to offer!! I have a 60mm body lift and the brochure says the springs will add 75mm. I'm getting the emu dakkar but apparently they settle a little so call it 50mm. With that height, and the extra 50mm lift from tyre diam, I want to give it some stability.

I figure that with the right offset, I can have the inside edge of the wider tyres sit where the inside edge of my 31x10.5's are now. That will reduce rubbing as much as possible and I'll still have 2in wider each side.

If I do go for less offset, what is the chance I'll lose some of my steering lock, or rub on my guards?

less negative (ie out away from the hub) offset is less likely to rub on steering but more likely to run in the back wheel wells. it's a lose - lose situation

the extra width of your new tyres will add 2" to your tack width even if you keep the same offset. if you keep the same backspacing (ie add extra negative offset to put the inside edge of the tyre where the old one was) then you will add 4" to your track width and you will be at the limit of factory style or flexible rubber flares.

cheers

Went for a drive today, visited a few dealerships and found out the following:

ROH Track II In 15x7 has 9mm backspace. With no other info to go on I can only assume that is the same as a stock cruiser rim.

ROH Track II 15x8 has 22mm backspace. By my calculations, this means that the 8" rim is like a 7" rim with an extra 1" added to the outside (give or take 1 or 2mm)

I guess with that rim plus the extra width of the tyres, they'll stick an extra 1/2in inside.

Speedywheels have a 15x8 rim with 28mm backspace which is a little cheaper.

I think I'll see if I can get them to fit front tyres to see how they go, then choose which rims and come back another day to get it all done.

Doesn't help that I'm a little impatient with these things....