[CairnsZook]

Can anyone tell me the distance from the hub out to the widest point of the flare on a WT Sierra?

Or what width rim, with ZERO offset, will sit flush with the widest part of the flare?

[steak_knife]

what are you trying to achieve??

[CairnsZook]

I'd like to know how far various sized, and various offset rims stick out past the flare.

Then I might be able to work out the minimum offset required for a 33x10.5r15 tyre on a 15x8 rim to clear the leaf spring on full lock.

[Damo]

A 15x7 with -1" offset will be pretty damn close. That's what I run with 235s. With a 10" tyre maybe halve the offset?

15x8 with 0 offset and a 10.5" tyre will clear the springs but I reckon it will hang outside the flare. I'm pretty sure my first zook had this setup.

[Fatzook]

My 20x8.5 with 33x12.5's are a +10 offset, and they strike the NT springs by 5mm or so. You having a 10.5" tyre would give about 20mm clearance from spring.

So any 0 offset or neg offset 15x8 should clear. (if you have NT spring spacing. Which you don't? )

[BlueSuzy]

My 33x12.5's rubbed full lock on the lugs only. Wt spacing. -28 offset 15x8. Tyres were undersize in diameter, so prob undersize in width too. Stock wt flare with 3" bushranger flare rubber came flush with sidewall.

Depending on flex too, they wil rub everywhere!

[CairnsZook]

Hey Damo, do your new tyres on 16" rims hit the leaves on full lock? They're about 31.5" aren't they?

Yeah Fat, NT spring spacing would be the grouse, but I don't want to do any irreversible mods just yet.

Thanks Timmay. Looks like a -28 will clear the leaves for me then. I'm not worried about the tyres rubbing elsewhere.
I'll move the diff forward to clear the firewall and "modify" the guards to suit
Although, I only want just enough offset to avoid any unnecessary chopping.

I'm at sea at the moment, so it's a bit hard to measure stuff. I can have the tyres ready to pick up when I get home, but obviously can't order rims yet...
I'll try to borrow a 15x8 with a small negative offset, fit a tyre, then space it out until it clears.

[shep]

i had 32s on a wt with -13 rims and only had light scrubbing on one tyre.

[Damo]

CairnsZook wrote:

Hey Damo, do your new tyres on 16" rims hit the leaves on full lock? They're about 31.5" aren't they?

Yeah Fat, NT spring spacing would be the grouse, but I don't want to do any irreversible mods just yet.

Thanks Timmay. Looks like a -28 will clear the leaves for me then. I'm not worried about the tyres rubbing elsewhere.
I'll move the diff forward to clear the firewall and "modify" the guards to suit
Although, I only want just enough offset to avoid any unnecessary chopping.

I'm at sea at the moment, so it's a bit hard to measure stuff. I can have the tyres ready to pick up when I get home, but obviously can't order rims yet...
I'll try to borrow a 15x8 with a small negative offset, fit a tyre, then space it out until it clears.

They don't hit the springs, but they only measure 30.5. I will have to have a look and measure the tyre to spring clearance on full lock. There should be plenty of room there.

[BlueSuzy]

My diff was 30mm forward. Cleared the firewall, but meant the rubbing was moved elsewhere. Got a BFH behind the headlight buckets, alot of room there, but still rubbed on full flex, stock bumps. Also rubbed on shock mount, Smoothed that with a hammer too. You may need to do that also. Again, mine may be different. Different heights, conditions, flex etcetc

[CairnsZook]

Here's some more info:

Gwagensteve wrote:

With 33 12.5's, a 3.75" backspaced 8" rim is normally fine. More width is no real advantage, and doesn't help tyre clearance as scrub radius increases - moving the clearance problem to the headlight buckets and the firewall.

skyman wrote:

I am running 33 12.50's on 3.5 inch backspaced wheels. At absolutely full bind, I get a little bit of rub. If I had big side lugs on my tires I may rub a little more.
I would think with a 10.5 tire it would be close, but not quite as bad.

FWIW
A lot of it has to do with how wide the rim is VS the tire, a skinnier rim for a wider tire will make it bulge over the side of the rim more.

And I've emailed a bloke in Devonport selling some 15x8's.

bloke in Devonport wrote:

I cant remember exactly what the offset is but I do know they were the smallest offset they offered in that rim (Rock Crawler rims) ... Those tyres are 32x11R15 For memory it was if you pulled it on full lock and just let it go a little bit it wouldn't touch.

[CairnsZook]

Well I fitted a 33x10.5 on a 15x8 -28mm offset rim today.

At full lock, the tyre clears the front of the spring easily, and the back clears by about 5mm.

I was going to get some speedy rims, but they only do -24mm offset now. I know it's only 4mm, but I really don't want to go any less then -28mm

Does anyone know what offsets are available in King or Dynamic wheels?
I can't find much info on them...

[weaves]

Back in 08 i know king wheels made -28 offset, i have a a set on the zook, and a couple of spares.

[stockman]

King say they only do -23 now. And in Sunraysia I can only find -25.

[BlueSuzy]

stockman wrote:

King say they only do -23 now. And in Sunraysia I can only find -25.

correct. Thats what i've heard too from past people on here. -25 is legit. -28 is not.

[stockman]

What brand were your's Timbo?

[BlueSuzy]

King

What if you ask for F100 pattern? Maybe they go by a listing..

Or source some f100-150 wheels from the us? Heaps around and cheap. my alloys were landed around 600aud.

rockcrawler rims are dear, but thats another option.

[smiffkid]

dynamics do a -25,
other wise u could run wheel spacers or get some 15x8s and have the centres cut out and flipped to give u some more offset, thats not really that expensive

[CairnsZook]

No, I wont be running wheel spacers. In my opinion, they are just dodgy...
Any idea how much to get centres cut out and re-welded?

[jonno_racing]

CairnsZook wrote:

No, I wont be running wheel spacers. In my opinion, they are just dodgy...
Any idea how much to get centres cut out and re-welded?

weatherhead down here does them.. but u beta not be in a hurry.

[CairnsZook]

Thanks Phil, I'll give him a call tomorrow.

Now the question is whether to get 4 or 5.
I've always bought 5 tyres, and rotated the spare regularly. But the Silverstones are directional, which would mean having a tyre changed on the rim each time. Also being play tyres, they won't see much road use at all, therefore should not wear quickly...

But then again, if I'm on the West Coast of Tassie and shred a tyre, that's a long way to drive with an unmatched spare...

[zukmeista]

Maybe see if you can get a 33.10.5.15 normal mud tyre to fit? I wouldn't run a directional tyre backwards because they are called directional for a reason

[5ierra]

I've noticed at alot of comps up this way the boys will run directionl tyres and have a matching size non directional as a spare...

[CairnsZook]

Slight change of plans, I'm now going to get 33x9.5r16's...

That's if I can find 16" rims with a suitable offset. I thought there would be more choice in 16", but it seems there is less.

Hey Damo what rims and offset are you running?

[alien]

my 15x7 -38's stick a 31x10.5r15 out of the flare by 50mm =P