Thread: Lift Kit Requirements to fit 255/85's

Originally Posted by n plus one

My 265/75r16s did the same thing on Boost rims - I don't think the side biters help!

I think a 265 on a 7 inch Boost rim is going to have close to the same side wall overhang as a 235 on a 5.5 inch Steel rim. Given that a Boost is a + 33mm offset rim, same as the 5.5, but wider, Im going to make a huge GUESS and say the inside of the 265 tyre would be further in than the 235.

Can I ask what vehicle they were fitted to?
what were the rear spring rates?
what was the rear weight?

Originally Posted by frantic

Yes have them now(255/85 R16 bighorns), you don't need a lift, I had them originally on stock suspension(sagged as 120,000k's old) and with the boost alloys which are +30mm offset(that's 30mm closer to car,0 is dead centre and negative causes the wheel to stick out further) the rear tyre would only just touch the spring mount on full flex up /other side hanging down. I've now fitted Gwyn Lewis kit along with 2in dobinsons and OME shocks and also put 4, 30mm wheel spacers from the U.K so they don't touch the mounts at full flex. These spacers are not legal in Oz but are Ok in U.K and E.U. and with 255's your tyres are just inside the standard flares so you don't need the extra cost of new ones.
The other option is to fit offset wheels, as the tyres are 255 there are plenty of options.+10mm , 0, -15mm, etc. but if 35 inch rubber is even a remote thought others recommend -25mm. Remember once you go past 0 you will need wider flares to stay legal.
One other thing , have a read about the transfer case/prop when lifting a Puma as I've read off issues with some people.
Could you stick up a few pic's of the finished def?

Wil definitely post some photos once the tyres and rims are on.. This is gonna take longer and cost a lot more than I expected.. Got some wheels to be ordered from UK if the price don't shock the misses… maybe i should just buy them and hope she doesn't notice I think they are silverline rims with +15 offset.

Prob go with with a slight lift on the backend and change shocks to bilsteins. fronts already raised slightly with heavy duty LR springs so should be ok

Originally Posted by uninformed

I think a 265 on a 7 inch Boost rim is going to have close to the same side wall overhang as a 235 on a 5.5 inch Steel rim. Given that a Boost is a + 33mm offset rim, same as the 5.5, but wider, Im going to make a huge GUESS and say the inside of the 265 tyre would be further in than the 235.

Can I ask what vehicle they were fitted to?
what were the rear spring rates?
what was the rear weight?

I'd second your guess.

Vehicle was (is) a MY09 110 wagon - heavy rear springs (cant recall rate, sorry) plus air assist bags (~20psi) and dual shocks. Load varied from 500kg to 1000kg.

255/85s on ET10 rims on the same rig don't touch.

Originally Posted by n plus one

My 265/75r16s did the same thing on Boost rims - I don't think the side biters help!

Boost rims have 3/4" more backspacing than Wolf and stock Defender steel wheels. It is expected that they will rub on a 110 in the rear with the wider spring perches.

I have no idea why uninformed's stock sized tyres are rubbing on stock sized wheels unless there is something non-stock about his truck.

Originally Posted by Red90

Boost rims have 3/4" more backspacing than Wolf and stock Defender steel wheels. It is expected that they will rub on a 110 in the rear with the wider spring perches.

I have no idea why uninformed's stock sized tyres are rubbing on stock sized wheels unless there is something non-stock about his truck.

Yeah, I expected them to rub!

Surprised tat they would have that much additional back space though - they're ET33, while Wolfs are ET20.6 but a bit narrower.

Originally Posted by Red90

Boost rims have 3/4" more backspacing than Wolf and stock Defender steel wheels. It is expected that they will rub on a 110 in the rear with the wider spring perches.

I have no idea why uninformed's stock sized tyres are rubbing on stock sized wheels unless there is something non-stock about his truck.

yes there is something(s) not stock about my truck.

+2 spring lift, different rate springs, +25mm bumpstops.... The answer is in one of my photos

Originally Posted by n plus one

I'd second your guess.

Vehicle was (is) a MY09 110 wagon - heavy rear springs (cant recall rate, sorry) plus air assist bags (~20psi) and dual shocks. Load varied from 500kg to 1000kg.

255/85s on ET10 rims on the same rig don't touch.

When you say heavy rear springs, do you mean LR type of AM? And were they stock height or longer?

Originally Posted by uninformed

When you say heavy rear springs, do you mean LR type of AM? And were they stock height or longer?

Dobinsons, 50mm lift.