Outer Limits 4x4 Board

Hello
I've got a F75 rocky with no mods yet, and i'm wondering what tyre size to go for. 30x9.5 or 31x10.5 are the sizes i've been looking at, which will be going on to fairly deep dished 8x15 rims (I think they are off a F100?).
Is the extra diameter/size of the 31" likely to cause clearance issues, or hinder its crawling ability?
I am still putting it back together so I haven't had a chance to test it and see what its like with its current 235/75x15 tyres.
Thanks in advance

I prefer 30's, as I have found the 31's a bit much for the motor on the highway. It kills your economy. I do have a set of mags with 31' muds on them, that I trailer to a location if I am doing some serious stuff.
The 31's do hurt your crawling, but I use 4L nearly all the time anyhow, so not too many dramas.

31"s will scrub if you've got no lift yet. My 31" ET's Scrubbed a little bit on full flex with 2" suspension lift, albeit slightly sagged, and they scrubbed on the front springs when turning too, i think they where15x10.5 so a bit too wide.

235 75 15's are what I'm running now as daily's. No scrubbing except for a tiny bit at full lock on the front springs.

And low range suxs with 31"s , but the extra clearance well makes up for it IMO. I wouldn't drive on them every day though, makes it a lot slower to take off, and chews more fuel.

I've been running 31's for most of the 4years i've had mine and they've been fine. I've been running maxxis buckshots (on my 2nd set now, got 95000ks out of first set) and have only noticed they scrub inside the front guards at the top when fully flexed.

I find them better on the highway than the 29's that were on it when i first bought it as it drops the rpm at 100k's nicely.

I love my 31" and can't complain about any decrease in power or change in low range crawling. I wouldn't have any other size.
I contemplated 30" when I was looking, but glad I chose the 31".

If you have a turbo it won't be slow, Nath is just jealous

You might need to get a bit of lift though as stated.

Hmmm.... I reckon i'll end up going the 30" tyres, i'm keen to avoid scrubbing as it will be a while before I get around to lifting it.
Thanks to everyone who posted. I'll also put some pics up in the next few weeks if anyone is interested.

HotFourOk wrote:I love my 31" and can't complain about any decrease in power or change in low range crawling. I wouldn't have any other size.
I contemplated 30" when I was looking, but glad I chose the 31".

If you have a turbo it won't be slow, Nath is just jealous

You might need to get a bit of lift though as stated.

Just remember, my ET's are closer to 32" when you measure them, unlike those racing slicks you call 4x4 tyres

And turbo might be on its way

RockyF70 wrote:

HotFourOk wrote:I love my 31" and can't complain about any decrease in power or change in low range crawling. I wouldn't have any other size.
I contemplated 30" when I was looking, but glad I chose the 31".

If you have a turbo it won't be slow, Nath is just jealous

You might need to get a bit of lift though as stated.

Just remember, my ET's are closer to 32" when you measure them, unlike those racing slicks you call 4x4 tyres

And turbo might be on its way

Your ET's?

I didn't think you owned a set of Simex?



P.S - MTR FTW!

You mention that you have rims from an F100, 8" x 15". How are the offsets?

I wanted to change mine but they couldnt tell me if they were offset out further or in further?

When I was looking the 15x8" with 0 offset were equivalent to my factory wheel offset.
They also had -11mm, -19mm, -23mm and -28mm offsets.
The more negative the number, the further they stick out from the centre of the car.

Thanks, I have found that it would be cheaper to purchase F100 sunraysia's than to get my rocky wheels powder coated. Just couldnt find the offset of the rock wheels.....


Now where talking

I haven't actually tried the F100 wheels on the rocky, but they stick out a fair way on the zook and they have a fairly deep dish.
I'm not even 100% sure they're even F100 wheels, they're sunraysia style with a huge centre hole and very thick steel on the centre bit

you must mean real simex's
like mine

did not know f100 rims fit the rocky bugger said no to csome the other day when i was lookin for a second set of spares...whats the scrubbing value like with the deeper rims??? i hve no lift and do i need spacers???

You won't fit 31" tyres with stock suspension, unless you like using the angle grinder.

The more offset you have, the more likely to scrub on the guard when the suspension is flexing and turning the steering.

Wheels off Feroza's, Suzuki Sierra's and Vitara's also fit.

Don't get spacers...If you want a good offset, buy rims with bigger backspacing, spacers aren't a good idea. One more part to go wrong.

I have 15x8" with -23mm offset, which is plenty for any mild rocky... I have a widetrack model, and the rubber is level with the big flares. On an older one theyd be sticking out a few inches!

Ive got 30"-9.50 mud tyres on steel speedy wheels and 31"-10.50 all/terrains on alloys . I loose heaps of steering lock with the 31"s both f100 wheels

[img][img]http://img511.imageshack.us/img511/6151/rckydy4.th.jpg[/img][/img]

[img][img]http://img511.imageshack.us/img511/421/04012007068gj6.th.jpg[/img][/img]

Yeah, the leaves get in the road of steering a bit hey... One advantage of IFS I suppose

Larger offset wheels will also affect your turning circle and scrub radius.. all things to watch out for.

What sort are the 31" tyres mate?? They look very different to anything I've seen before. Very chunky

The tyres in the pics are YOKAHAMA MUD DIGGERS 30x9.50

my A/Ts are pirelli 31x10.50 there worn and im gettin the new KHUMO KL71 $190 ea

[img][img]http://img257.imageshack.us/img257/9220/26112007002mc0.th.jpg[/img][/img]


ps im still a NOOB

HotFourOk wrote:Yeah, the leaves get in the road of steering a bit hey... one and only advantage of IFS I suppose

Fixed it for ya

RockyF70 wrote:

HotFourOk wrote:Yeah, the leaves get in the road of steering a bit hey... one and only advantage of IFS I suppose

Fixed it for ya

Yeah, I'd have solid front with leaves everyday for comfort factor alone! IFS is teh suxx0r

HotFourOk wrote:

RockyF70 wrote:

HotFourOk wrote:Yeah, the leaves get in the road of steering a bit hey... one and only advantage of IFS I suppose

Fixed it for ya

Yeah, I'd have solid front with leaves everyday for comfort factor alone! IFS is teh suxx0r

I reckon. I mean, how else can u get a whole body vibration massage when driving