steel rim offset

[redlightdisco]

Hi there fellow disco nuts . I'm new to all this and this may be a daft question but here it goes . I have a 96 s1 discovery 3.9 on gas & am nuts over it , i'd like to put some 31x10.5 15 tyres on it as i have a set of mickey thompson mtz's sitting around , if any what offset should i get on my new rim's ? The disco has a 2 inch lift so i think i'll be ok for guard clearance . Any tip's or advice would be appreciated :cool: cheers

[p38arover]

Hi there fellow disco nuts . I'm new to all this and this may be a daft question but here it goes . I have a 96 s1 discovery 3.9 on gas & am nuts over it , i'd like to put some 31x10.5 15 tyres on it as i have a set of mickey thompson mtz's sitting around , if any what offset should i get on my new rim's ? The disco has a 2 inch lift so i think i'll be ok for guard clearance . Any tip's or advice would be appreciated :cool: cheers

I can't tell you what you should have with that combo but the standard rims have 33mm offset (stamped on the rim).

[rangieman]

Hi there fellow disco nuts . I'm new to all this and this may be a daft question but here it goes . I have a 96 s1 discovery 3.9 on gas & am nuts over it , i'd like to put some 31x10.5 15 tyres on it as i have a set of mickey thompson mtz's sitting around , if any what offset should i get on my new rim's ? The disco has a 2 inch lift so i think i'll be ok for guard clearance . Any tip's or advice would be appreciated :cool: cheers
You should be able to get away with standard offset sunraisier type rims with 31/10.5/15,s;)

[discowhite]

yep! the standard run of the mill 15x7 sunnie will have the perfect offset for them tyres!
they are what i had with my old 31 10r 15 mongrels, BUT be ware they will widen the track past the ''legal'' limits... it wont look out of place and will suit the disco fine but just be ware of the track issue;)

cheers phil

[p38arover]

yep! the standard run of the mill 15x7 sunnie will have the perfect offset for them tyres!
they are what i had with my old 31 10r 15 mongrels, BUT be ware they will widen the track past the ''legal'' limits... it wont look out of place and will suit the disco fine but just be ware of the track issue;)

If the Sunraysias have the same 7" width as the standard rims but they change the track, then that means the offset is incorrect and, in fact, greater.

It follows then, that the Sunraysias could be illegal, especially if they have increased the track by more than 25mm.

[Utemad]

From what I've seen the 15in rims available off the shelf will increase the track. I guess if you order them in you can ask for whatever you want though.
In Qld you can widen the track by 50mm front and rear as we have solid axles front and rear.

As for a 2in lift giving you plenty of guard clearance I can assure you that you won't.
245/75R16 on the standard rims will require a small trim but if you widen the track you will have to trim more as the tyre will no longer be able to tuck up into the guard.

I have the 245/75R16 on standard steel wheels and have done the trim but still catch the RHS tyre on the guard. I have one bent trailing arm which I think is causing the problem.

The trim is just the rear of the rear wheel arches. Nothing major.

[p38arover]

Ah. I didn't realise that off-road vehicles with beam axles were allowed 50mm increase in track. That's good. Thanks for that info.

I wonder if it's the same in NSW. Quite probably.

[discowhite]

Ah. I didn't realise that off-road vehicles with beam axles were allowed 50mm increase in track. That's good. Thanks for that info.

I wonder if it's the same in NSW. Quite probably.

problem is the off the shelf sunnies add closer to 80mm to the track!:eek: this i dont see as a problem mechanically, as the disco has big beefy wheel bearings. the added stability of the offset is a deffinate bonus and so is the return of steering lock!

cheers phil

[p38arover]

the offset is a deffinate bonus and so is the return of steering lock!

That could be beneficial! :D

[long stroke]

Yep some 15x7" sunnies will do the trick just fine:)
We had a set on the disco for a while (31/10.5/15" cooper stt's)
All we had to do was give the rear guard a slight trim, no problems up front;)
Here's a pic...

https://www.aulro.com/afvb/images/imported/2009/09/1202.jpg

CHEERS TIM.

[Boxer]

16 x 8 -25 Dynamic steelies on mine.

[Cap]

16 x 8 -25 Dynamic steelies on mine.

How much did your rims set you back Boxer?

[cal415]

16 x 8 -25 Dynamic steelies on mine.
Digging up and old thread, but i would also like to know what they were worth, and where you got them, -25 is that 55mm extra each side?
Anyone know what the standard offset is??

[discowhite]

around 130mm backspace cal!

cheers phil

[discoveryseries1]

Yep some 15x7" sunnies will do the trick just fine:)
We had a set on the disco for a while (31/10.5/15" cooper stt's)
All we had to do was give the rear guard a slight trim, no problems up front;)
Here's a pic...

https://www.aulro.com/afvb/images/imported/2009/09/1202.jpg

CHEERS TIM. just saw you have 15s on a disco, do you know if a defender 15" will fit on a disco ? thanks, ps nice wheels, :)

[p38arover]

Anyone know what the standard offset is??

See my reply on the first page! 33mm for standard rims.

[dullbird]

Ah. I didn't realise that off-road vehicles with beam axles were allowed 50mm increase in track. That's good. Thanks for that info.


I wonder if it's the same in NSW. Quite probably.

25mm in NSW

[Crackerjack]

25mm in NSW

Just to clarify, does that mean that you can only increase track by 12.5mm each side

[dullbird]

Just to clarify, does that mean that you can only increase track by 12.5mm each side


I believe so (legally) but I would have to double check that...I did send a message to the engineer to check it but he hasn't got back to me.

So dont quote me on it......perhaps Slunnie might know he is pretty up on these sorts of things

[edddo]

Old thread but rather than starting a new one....

I have old 15 inch sunnies on my D1 because the tyres ( 31x10.5) are so much cheaper for the size and well, they just work well with the car.
But they are looking tired and I want to update but keep exactly the same diameter and offset. Im also in the market for new tyres shortly so maybe I will do rim/tyre together.

Stamped on the inside of the rim is "7JX15 02 6 YF" (Made in Taiwan) They are about 14 years old.

So is the 26 referring to the offset?

thanks

[edddo]

02. Year manufactured
6. Month manufactured

Offset. Who the **** knows.....guess I will measure it

Would have thought there would be some offset ID on a rim.....

[edddo]

So I have measured to the mounting face from a flat surface from both sides (tyres on so maybe some error due to this)

meas 1 120 (mounting face up)
meas 2 145 (mounting face down)

So my wheels have +12.5mm offset right?

ie the wheel centre-line is 12.5mm 'inside' the mounting face.

Like the image on the right here ..scroll down a bit... Wheel Offset Calculator Guide (https://www.tyroola.com.au/guides/wheel-offset-calculator/)

My guess is that the rim has +10 offset.