Outer Limits 4x4 Board

Hi All.

I have read all of the posts (I think) regarding tyre and rim combinations, but have not been able to find an answer for my specific setup.... If I have missed a post with the info that I am looking for - then please point me there!!! ;-)

Ok.... I have a 91 WT Sierra soft-top. It has a 2inch spring lift, and is about to get a 50mm body lift... With that setup, what tyre/rim setup would be advisable???

I was thinking (assuming) that 31's (or maybe 32's) would be the go, with sunraysia rims (F100 perhaps??)??? I am happy to invest in wheel spacers too -if required (I AM aware of the extra strain this causes the wheel bearings.)

I am confused!!! I guess I am really looking for someone who is running a 2inch spring lift AND 50mm body lift, to let me know what tyre and rim combo works for them!

Cheers all,

Pez

Depending on your gearing, 31"s

i have what u want and works well with 31s in all terrain tryed so far. i agree on gearing and will depend on where u want to drive.

btw before the gods scream at you. search around. may want to search lift or lift and tyres.

Thanks for that guys... No problems at all.

At this stage I have stock gearing, but I will get around to putting some lower gearing in eventually. (A mate has a few sets of 31's that he is happy to donate for this project, so it looks like its come down to the rims and offset options then...)

With F100 rims, is there a particular offset to get, or do the 5-stud ones all have the same offset???? I take it that NO modification to the offset on these rims is required????

Nicbeer- a question 4 you- Are you running your 31's on F100 rims, or something else - and are you running spacers??

Pez

I am pretty sure that all the f100 rims that fit the sierra's (some have different centre holes and do not fit as I'm told) are the same offset and definately alot better than stock for that reason and extra width.They will not need extra work to the offset unless you plan a very wide car, the f100 wheel is the maximum offset sold for the sierra stud pattern so it makes things alot easier.

I have a couple of sets of f100 steels I plan to be using on my car and planning a similar setup to yours with suspension and body lift and the 31's sound like a good choice for this setup.

Stubbs

no spacers.

15x7 f100 rims yep. i have two sets here but have not run the other set yet.

basicaly hang out 1" or so outside std WT flares i think.

there is two diff f100 rims in the 5 stud. as stubbs said they differ on centre bore hole.

make sure you measure the hole, i carted some 2 hours home just to find out they where wrong.

i think it is meant to be 110mm

i did the same as spamwell for a spare i picked up- only checked after i painted it - was sad :( - and yes centre has to be 108mm

You guys are champions!

Thanks a heap for the info. Being new to Zuks, I have found it can be an interesting task finding the right info in amongst the 100001 different opinions! You have saved the day ;-)

Cheers again!

Pez

Buy SPEEDY steel rims not ROH TRAK II.

Speedy have the "correct" offset for a sierra, the only offset available on ROH rims in 5 stud 15X7 is incorrect for a sierra. (correct for an f150 and vitara, not sierra)

speedy are lower quality and cheaper, but a better product for the application.

Steve.

I've heard from somewhere that lada rims mounted backwards ... give big offset

also is F100 -30mm

Gwagensteve,

When you say "correct" offset, do you mean that F100 rims will:

1) Not have enough offset - ie will rub on full lock?

OR

2) Will have too much offset and stick out past the flares? (I dont mind if this happens as I will just go the Bunnings flare option.)

Pez

Pezooki wrote:Gwagensteve,

When you say "correct" offset, do you mean that F100 rims will:

1) Not have enough offset - ie will rub on full lock?

OR

2) Will have too much offset and stick out past the flares? (I dont mind if this happens as I will just go the Bunnings flare option.)

Pez

He says the ROH rims suit the Vitara and the F150. The vitara is an IFS vehicle, usually IFS vehicles are suited to more inset wheels, and live axled units like our Sierras are suited to outset wheels. So from this I conclude that the Speedy is more outset, and ROH is more inset. But I'm not 100%.

Highway-Star wrote:

Pezooki wrote:Gwagensteve,

When you say "correct" offset, do you mean that F100 rims will:

1) Not have enough offset - ie will rub on full lock?

OR

2) Will have too much offset and stick out past the flares? (I dont mind if this happens as I will just go the Bunnings flare option.)

Pez

He says the ROH rims suit the Vitara and the F150. The vitara is an IFS vehicle, usually IFS vehicles are suited to more inset wheels, and live axled units like our Sierras are suited to outset wheels. So from this I conclude that the Speedy is more outset, and ROH is more inset. But I'm not 100%.

Correct, you can buy Speedy rims with a greater offset than ROH rims.

Ok guys.

That does not answer my question though, unless the F100 rims ARE made by ROH???

Is this the case???? If so, it all makes sense... If not, then my question again was,

--------------------------------------------
When you say "correct" offset, do you mean that F100 rims will:

1) Not have enough offset - ie will rub on full lock?

OR

2) Will have too much offset and stick out past the flares? (I dont mind if this happens as I will just go the Bunnings flare option.)
--------------------------------------------

Pez

lada rims would be great back to front but there 16"

I haven't used of compared "F100" rims, however i have bought Speedy 15x8 steel wheels with -28 offset. This is the greatest offset rim that you can buy from a store which suit sierra stud pattern. AFAIK this is the F100 rim most people are talking about (i.e. -28 offset). The equivalent offset in a 15x7 rim is around -15 from memory. These WILL stick your tyres out from standard WT guards (easily fixed with bigger flairs)

I have run both 32" mongrels (only measure about 31" but 11" wide) as well as 32" BFG muddies (actually measure 32" and 11.5"wide) on the Speedy 15x8 rims with -28 offset. Both these sets of tyres still rubbed on full lock, however if you were to run 31" normal muddies (i.e. bfg, wranglers etc) i reckon you'd get away with no rubbing on the springs. To stop the rubbing with the 32's i had to extend both steering stops about 10mm.

So in conclusion, unless you are trying to buy "F100" rims second hand or something, just go into any wheel joint and ask for 15x7 or 15x8 Speedy rims to suit a sierra stud pattern with the largest negative offset.

Does this help out with your question?

Spot on Zooker!.

That helps. Thanks!

Off the Speedy website, the 15x7 Spec is:
Size= 15x7.0 Offset= ET-15 Stud= 5x139.7, 6x139.7

If anyone knows the F100 specs, that would be nice to know...

I think I will look into the 15x7 Speedy option... The reason I was/am so interested in the F100 rims is that I 'think' I will be able to get my hands on set pretty easily (and cheaply), but I do want to do the job right!
Based on the info I have now, I will go and do some Speedy window shopping.

Thanks again,

Pez

if they are cheap ie 2nd hand.

to give u an idea.

my first lot cost me $100 set of 5 and another set cost me $125 set 4

Cool. Yeah I know a few guys with F-ies, and if they come up with the goods, it will only cost me a slab or 2.

I would grab them either way, but the ball is in their court so who knows how long I will be waiting!

Do you guys know roughly the ball-park pricing for the 15x7 Speedy's?

Pez

Pezooki wrote:
Do you guys know roughly the ball-park pricing for the 15x7 Speedy's?

Pez

Bout $55

saffrett wrote:lada rims would be great back to front but there 16"

hmmmmmmm
might have to look into this

Another 'quick' question for you guys..

On my zook (2in Spring Lift and 2in Body Lift), If I run 31/10.5 R15 Pro Comp X-Terrains, on SPEEDY's, would the 15x7 or 15x8 be the best option???

ps- I would be happy to muck around with the steering stops if required...

Pez

With 15x7 there would be less risk of the tyre coming off the bead at low pressures. In saying that, i've regularly ran my 31's on my 15x8 rims at 10-14psi and have had no problems, they bag and grip quite well. Most of my driving is slow speed and im aware of the low pressures so no high speed cornering etc.

I have found going off the recommended rim width for tyres they say an 8.5" rim will suit a 10.5" tyre. That has been on most muddies anyways.
However they say it is possible to use a 7" rim up.
So does that mean that if I run the recommended rim width the tyre at lower pressure it is more likely to run off the bead? Than a skinnier rim.
I have been waiting for someone to start this. I read elsewhere of someone on here running 9.5's on the stock rim.

Has confused me a little as I am looking at a set of the speedy 15x8's when I get my new tyres. Most probably 31x10.5's at this stage

OK got a question continuing with the offset and rims part.

31x10.5 tyres on 15x8 -23 rims. Would this be suitable, or will I have scrubbing on the springs etc. I estimate from measurments of my existing 15x7 -25 alloys with 205 road tyres, that I should get about 1/4" clearnace with the 15x8 -23 rims and 31x10.5 tyres at full lock. But this is an estimate only, real world is usually different.

Pezooki wrote: ps- I would be happy to muck around with the steering stops if required...

How do you muck around with steering stops on a Sierra? They are the bolts in the swivel hubs arn't they, quite a unique shaped bolt, and getting bigger headed ones could prove difficult...

Highway-Star,

I have not got that far yet, but zooker said that he did it!

As for the tire and rim issue, I was just told by 'Pro Comp' that the 31/10.5 R15 X-Terrains will be fine on a 15x8.0 ET-28 5x139.7 Speedy rim. It will give a 3/4 wider track on each corner over the Speedy 15x7.0 ET-15 5x139.7 when on a Sierra.
They also said that low pressures (10-15psi) should not worry the X-Terrains too much at all on the 15x8.

Pro Comp sell a Speedy equivalent rim called "Dynamic Rims". Has the same specs apparently.

ALL of the above info is from PRO COMP. It DOES NOT take into account issues with panel and suspension clearances - just so we are clear... (I guess thats our problem isn't it! )

i run 31x10.5 radial claws on the speedy 15x8 rims with a 2" bodylift and OME 40mm springs on a 91 WT. they don't scrub anywhere. i did need to bash the rear of my front wheel wells though, but thats no big deal. i also have a set of 215 wranglers on the 15x7 speedy rims. my claws stick out past the WT flares about 1.5" but i just did the bunnings garden edging. so far i have had no problems with driving around at 8psi you just need to be careful.

Hi Taff,

Thanks for that info mate. The 15x8 Speedy's are looking good!

Pez

you will love the extra width... look tough too