Thread: Larger wheels?

Do a search as there has been 100's of threads on this.

Basically all you need is 2" lift, Camel cut the rear guards and you can fit 235 85 16 rubber which in BFG AT new is nearly 32 1/2".

If you want taller than that you will need to cut crap loads out of the guards, fit flares, have some rims reversed or buy new rims and then you could fit 35 and with another couple of inch's lift and a body lift you could fit up to 38's.

Much above 32" you will have to start looking at gearing as well as fitting Maxi axels to drive it all.

Hope that helps you out.

Presuming you have the standard tyres (235/70 R16) then yes you can go to larger tyres.
It's probably the most common discussed subject on this forum so if you do a search you'll get your answer.
Steps are basically ;
245/70 - small increase in ground clearance no rubbing.
245/75 - ( my current size ) - larger increase in ground clearance and width but a small "trim" of the rear quarter panel is normally required if you're going to flex the suspension.

A lift is not absolutely necessary to tyres of those sizes, but probably a good idea because you get better all round suspension with those kits, and the car looks better....not like some lowered street racer

Other options are 255/70 and 235/85 as Mc Rover has, which is the standard Defender size, but you will defintely need a lift and more trimming. I think 235/85 and a 2" lift looks a very nicely balanced combo on a disco.

I currently have 235/ 70/ R16 Coopers Discovery.
I want 265/ 75/ R16 BF Goodrich. Do I need the 2inch lift kit still?
I searched breifly, but what key words sould i enter in the search? Also what is camel cut?

Thanks

Originally Posted by Four Boar

I currently have 235/ 70/ R16 Coopers Discovery.
I want 265/ 75/ R16 BF Goodrich. Do I need the 2inch lift kit still?
I searched breifly, but what key words sould i enter in the search? Also what is camel cut?

Thanks

For the size you want you will need the lift, the camel cut and possibly flares, 265 width will rub on full flex.
Camel Cut is a trim of the back of the rear wheel well. Do a search for camel cut and you will get heaps of hits with pics.

Originally Posted by Discobunny

For the size you want you will need the lift, the camel cut and possibly flares, 265 width will rub on full flex.
Camel Cut is a trim of the back of the rear wheel well. Do a search for camel cut and you will get heaps of hits with pics.

Shouldn't he be looking in the mud pit for this???





JC

If you are in QLD then you can only (legally) increase the OD size of your tyre by 15mm. For a standard 235/70R16 OEM tyre that has perhaps an outside diameter of 736mm then you can only go up to a tyre that has an OD of 751mm. AFAIK the 235/70/R16 D1 OEM tyre is the same size as the D2 OEM tyre for a 16" rim. Dunno about the 18" sizes.

So if you use Cooper tyres (for example) then you are limited to 235/70/R16 in the passenger construction or the 225/75R16 in a light truck. But if you switch to a 245/70R16 Bridgestone D694 with OD of 751mm then you will be just legal.

Most tyre makers publish the OD figure in their size charts. According to the brochure a Cooper 245/70R16 ATR passenger constructed tyre has an OD of 752mm while a 245/75R16 light truck ATR has an OD of 775mm. Both these would not be legal.

I have been unable to ascertain the OD of the original 235/70R16 Michelin XPC's so I do not know what OD to start adding 15mm to. It also seems that different tyre makers publish different OD's for the same tyre size. The Mickey Thompson 225/75R16 MTX and ATZ are both 745mm but a Cooper 225/75R16 ATR is 747 if you go for the 10 ply version while the 225/75/R16 Bridgestone Dueler A/T D694 is listed as 744mm.

Then there is the speedometer variance. Depending on the OD of the tyre for a given size, you will see a 1-2 percent variation in your speedometer reading eg tyre A is a 235/70R16 Bridgestone D694 with OD=736mm and Circumference=2313.14, tyre B is the same only 225/75R16 with an OD=744mm and Circumference=2360.29. Variance = 100 - (2313.13/2360.29 x 100) = 2.00% speedo variance.

As for setting the correct tyre pressures. Michelin seem to be the only manufacturer I have found that offer tyres that are capable of the maximum pressures indicated on the tyre placard (ie 46psi fully loaded/towing). Sadly Michelin no longer supply the 4x4 XPC rubber and currently only have the Latitude Tour/HP available. However, here are some recommended pressures according to a popular "4WD Driver's Guide": Bitumen:32-38psi, Sand:18-26psi, Fast/Smooth Gravel:32-36psi, Slow/Rough Gravel:26-32psi, Rocks: 22-28psi, and Mud 22-28psi.

The 4psi rule (applies to bitumen road use only): Inflate your tyre to the recommended pressure as per the vehicle placard for the given load. (how you do this if 46psi is way above the max psi of the tyre I have no idea). This pressure reading must be done when the tyres are cold. Then drive several kilometres or approx. 1/2 hour to ensure tyres are at operating temperature and take pressure reading. Ideally the pressure should be at 4psi above the cold reading. If the pressure is more than 4psi above then the tyre is under inflated and you need to add more air. Conversely if the tyre is less than 4psi above the original pressure then the cold pressure is too high and needs to be reduced. The catch is you're not supposed to let air out of hot tyres so I guess you need to take a picnic and/or a few beers.

QLD Transport modifications pdf refers: http://www.transport.qld.gov.au/reso...on_jan05v2.pdf

Hope this helps.
Cheers
Peter

Originally Posted by waynep

Presuming you have the standard tyres (235/70 R16) then yes you can go to larger tyres.
It's probably the most common discussed subject on this forum so if you do a search you'll get your answer.
Steps are basically ;
245/70 - small increase in ground clearance no rubbing.
245/75 - ( my current size ) - larger increase in ground clearance and width but a small "trim" of the rear quarter panel is normally required if you're going to flex the suspension.

A lift is not absolutely necessary to tyres of those sizes, but probably a good idea because you get better all round suspension with those kits, and the car looks better....not like some lowered street racer

Hey all, can anybody just double confirm / deny that a Disco1 will fit a 245/70 with no lift. I just wanted to check this before I pass on the info and the mod gets done.

Originally Posted by Slunnie

Hey all, can anybody just double confirm / deny that a Disco1 will fit a 245/70 with no lift. I just wanted to check this before I pass on the info and the mod gets done.

I know for a fact that some cars with stock standard 235/70/16 XPCs can rub on the rear 1/4 panel.
I discovered that fact on the very first AULRO trip DiscoDave did.