Thread: Max Width Tyres for a Series 3?

Scrambler - they just look tough

I already had the tyres - but you're probably right - so there's another grand.

Originally Posted by JDNSW

If you are planning to use this on road, I would check with the state authority - I think you are in Qld, and there was someone thre having a great deal of difficulty with a Landrover Game - which actually came form the factory with wider tyres, although not as wide as you are suggesting. There is now a legal limit on increase in tyre size in Qld and probably most other states. (even with an engineer's certificate).
John

John (and Sam) - current QLD regs say you can fit a tyre 1.5 x the maximum width tyre fitted by the manufacturer (to a 4x4 with beam axles F&R). For a series LR that means a maximum width of 11.25" or 285mm.

http://www.transport.qld.gov.au/qt/LTASinfo.nsf/ReferenceLookup/Modification_Jan05v2.pdf/$file/Modification_Jan05v2.pdf

I used to be in the "narrower tyres are better" camp (and still am to some extent), until I bought the last set of tyres for my IIA. I was running 235/85x16s (32" - same as or slightly smaller than a 7.50 - which are 32-32.5") and wanted to go up to 33" tyre. I was all set to buy BFG 255/85x16s, but at the time they were having compound problems with the new model, so I decided on 285/75x16 MTRs (which getting rave reviews at the time).

The MTRs transformed the IIA both on and offroad. I found I could climb hills that a mate with an almost identical IIA on 7.50s couldnt (or I did them easily and he struggled). I also fitted the MTRs to the county and they transformed the vehicle - stability and handling felt a lot better. Naturally this may have been a combination of a number of factors, but I doubt I could go back to 7.50s now.

You need to check variation allowed in track as well.
John

Found a useful summary :- http://www.toyo.com.au/TechInfoPDFs/...egulations.pdf

There are two pertinent points in addition to the 1.5 mentioned above :-

Track:-"Up to 50mm more than the maximum specified by the vehicle manufacturer for off-road
passenger vehicles fitted with front and rear beam axles"

Wheels:- " Steering limit stops must not be adjusted to reduce the turning circle in order to allow the fitment of alternative wheels and tyres."

John

Originally Posted by JDNSW

You need to check variation allowed in track as well.
John

Track is measured from centre-centre, so does not change unless you change wheel offset. Under current QLD regs (if you looked at the link I posted) you are able to increase track (2 beam axles again) by 50mm. So you can increase wheel offset by 25mm each side. 285mm wide 32" diameter tyres will not require steering stop adjustment on a series if fitted on +25mm offset (7-8") rims.

Btw - how would anyone be able to tell if you had adjusted your steering stops???

Originally Posted by isuzurover

Btw - how would anyone be able to tell if you had adjusted your steering stops???

Most unlikely - unless you get up the nose of someone in authority who can find the correct figures! However, note that the regulations I think somewhere specify a maximum turning circle of 45ft - and the lwb series is pretty close to this anyway (Series 1 may actually be over it!)

Another interesting point - both my S2a and S3 owners handbooks list 900x16 tyres as an option, as do the parts books, so the starting point should not be 7.5".

John

Originally Posted by JDNSW

Another interesting point - both my S2a and S3 owners handbooks list 900x16 tyres as an option, as do the parts books, so the starting point should not be 7.5".

John

Depends on whether you regard the one-ton as a different model to the 109, since 9.00s were only fitted to one-tons AFAIK. And seperate to the tyre width rule, there maximum rim width rules, which stop you going too wide - I think 8" rims are the legal maximum - unless wider was fitted from factory. But by then you are getting into silly widths anyway.

When/if the new NCOP (National Code of Practice) for vehicle modifications becomes law, you will be permitted to fit +50mm diameter tyres to vehicles. A 9.00x16 + 50mm is a pretty big tyre!!!

Ive had all sorts of tyres of the years and have settled to nothing wider than 11'' wide.

I currently run Q78s which are 35.5 x 11 and that are unreal.

Anything wider and you tend to have trouble keeping them out of your guards.

Tall and mid width is the go.

That said Im trying to find some 35x12.5 for on road.