Thread: Who has 285 tyres on there Defender?

Originally Posted by isuzurover

I am pretty sure the diameter of the michelin XZL (optional/original fitment on 110s/130s) is about 820-830 mm or so.

My IIA has 285-75s and it has gone through several inspections (RWC/transport/police) at various times in 2 different states and nothing has been mentioned. I don't know of anyone who has had (legal) issues having 33's on a series/110.

If and when the NCOP comes in, the rule will increase to +50mm for 4x4s.

I measured Col Coleman's XZL's one day and they were shorter than my Faulken AT 235/85's.

You are right - you would be dead unlucky to get pinged for having 33s on a series/110.

The change would reflect reality a bit more than the current rules.

Yeah, but remember that the size variation is from the biggest tyre that the manufacturer chart recomends, not the tyre neccessaarily fitted to the car now or as standard.

Originally Posted by CraigE

Yeah, but remember that the size variation is from the biggest tyre that the manufacturer chart recomends, not the tyre neccessaarily fitted to the car now or as standard.

And where do you get that size from??? The mathematical size is not the actual size. The "Tyre and Rim Standards Association" publish a manual of standard sizes, however there is a standard for road and offroad - so which one do you pick for a landie???

I have asked similar questions to QLD transport and received vague answers - which I suspect is the reason that the powers that be aren't keen on hassling anyone who is just over the 15 mm rule.

I'm pretty sure it's based on the nominal sizes listed on the placard though some push for sizes used by the manufacturer on that model but not necessarily on that placard (ie specials).

285/75/16's as standard ROCKCRAWLER.com - SEMA Show 2003 - Land Rover Defender 110 CKD

order your kit now.....................

Originally Posted by jimbo110

285/75/16's as standard ROCKCRAWLER.com - SEMA Show 2003 - Land Rover Defender 110 CKD

order your kit now.....................

That could be how LR can continue building the Deefa......as a home built kit

Yep well there you have it, factory fitted 285 75x16's.

I think they look good but Im not convinced in normal 4wding that tyres that big are all that nessesary but if you get a bit more serious into it then yes you need them.

There is a heap of contradictory data in this thread re fat vs skinny and I think in the end it comes down to what you use your 4wd for and where you want to get.

If you want them just for the look then I dont think it is the best thing to do as they do effect stopping distances, control and acceleration as well as economy but again thats just my opinion.

I run 235 85 16 on my Disco, I would probably go a bit bigger if I ran flares but i wouldnt really go over 265 75 16 Silverstones.

I think 33's are pretty acceptable though, 35's Simex's look great but are too big and as they are designed as truck tyres and in reality they over tyre a LR (as the compund and construction is designed for a 6 to 8 tonne truck not 2 to 3 tonnes of 4wd) drive terrible on any surface other than Mud and the others Ive had no experience with so I wont comment.

i agree with that, even though i have 285's. they look good and they take me where i want to go and are cheapish compaired to other brands. ive run LRH's JT2's on the 90 and they are horrible on road and in reality i dont think that the differance between the 33's im running and the 35's of his really make any differance to where i go. different story if it was a comp truck.

cheers phil

Originally Posted by mcrover

I think 33's are pretty acceptable though, 35's Simex's look great but are too big and as they are designed as truck tyres and in reality they over tyre a LR (as the compund and construction is designed for a 6 to 8 tonne truck not 2 to 3 tonnes of 4wd) drive terrible on any surface other than Mud and the others Ive had no experience with so I wont comment.

Why do you say that?

None of the Simex's are load rated for a vehicle that heavy. They're almost all very plain in the load rating for a 4WD tyre. The size range are also very much 4WD sizings.

Here are the ratings:
Dynamic 4x4, Simex 4x4, Sime 4x4, General tire, Dynamic Wheels, Sime, Grabber, Extreme Trekker, Wheels