Anyone have 15x8 Steel rims on their D1?

[F_U_Z]

Hi Guys,

First up, It's great to find such a great source of info :D

I have read, and read... and read for specific info on fitting 15x8 (http://www.roh.com.au/steelwheelsblacktrak.php) steel rims with a 30-32 (http://www.bfgoodrichtires.com.au/index.php?a=tires.technical_details&name_copy=off_road_suv.67)" tyre on a D1. I am still not confident that this is an idea that isn't going to cause problems.

What i am trying to achieve is a better traction tyre without neccessarily doing a suspension lift and or body lift - yet.

I currently have the factory 16x7 steel rims with a 235x70x16 setup. I'd ideally like to go to a 15x8 with a 30x9.5x15 or 31x10.5x15.

Does anyone know for sure that this kind of setup is possible without any kind of lift? Exactly how much bigger can i go diameter wise before i will have an issue? I gather if i keep it under control i can avoid any of the gear ration issues too.

Also, if this has been covered in another thread i have missed please just post a link to it :) Thanks for you help in advance!

Jason

[disco gazza]

Hi Fuz,
I got 15 x 8 on my D1.I did have 30x9.5x15 desert duellers on them,but when I put new rubber on them,they're 235x75R15 Mudstar muddies.
Only done cupla thou on them,but they're so far as good as the dd's.
Haven't been off-road as yet,but am ichtin to get them dirty.

cheers

disco gazza

92 disco tdi

[bblaze]

Welcome
I have and run mickie thompson 31 x 10.5 at's
Ihave got a lift but run airbags in the rear an 30mm spacer in the front
Also have a arb bullbar and 10000lb winch.
30" tyres would fit in standard trim I reckon but I thing they are to wide for the 8" rims
cheers
blaze

[The ho har's]

they will fit but VERY close to the brake calliper...


Mrs ho har:angel:

[Distortion]

I currently have 15x8 or 15x7 not sure alloys with 30/9.5/R16 Coopers ST's on them

They fit fine but I'm changing to 16x7 Steel with 245/75/R16 so my wheels are the same size as a mates disco, Turns out Insurance took issue with the 15's as they weren't standard equipment and wants a stock size on there

Is there any advantages to 15s rather than 16s ?

[Disco95]

G'day, I'm running 15 x 8's with 31 x 10.5's 2 inch lift and the rears still chewed on my rear quater (even coming out of my driveway). Bit of a chop and they're good.
I'm running standard rear springs in the front, no chopping of the guards, no problem. This may change whe I get around to removing the front sway bar though.
By the way, also running Bilstien shocks, and the front turrets have been lowered 2 inches, although this doesn't really affect upward travel.

[trobbo]

I currently have 15x8 or 15x7 not sure alloys with 30/9.5/R16 Coopers ST's on them

They fit fine but I'm changing to 16x7 Steel with 245/75/R16 so my wheels are the same size as a mates disco, Turns out Insurance took issue with the 15's as they weren't standard equipment and wants a stock size on there

Is there any advantages to 15s rather than 16s ?

The advantage that you will get is you will have more sidewall in your tyres for the same height. That means when off road more side wall to flex as you go over obstacles with tyres deflated.

Even when hard though you will still get some of this flex when on the black top which will detract from handling.

Eventually you will get to a point where there is too much side wall flexing and your steering becomes too vague. In the tyre sizes discussed here a 15 inch rim would be fine. IMO about 33 inch is the change over point to a 16 inch rim and 37 inch is the change over point to a 17.

[Tank]

I currently have 15x8 or 15x7 not sure alloys with 30/9.5/R16 Coopers ST's on them

They fit fine but I'm changing to 16x7 Steel with 245/75/R16 so my wheels are the same size as a mates disco, Turns out Insurance took issue with the 15's as they weren't standard equipment and wants a stock size on there

Is there any advantages to 15s rather than 16s ?
15" tyres are much cheaper to buy than 16's, Regards Frank.

[F_U_Z]

Thanks guys,

It looks like a 31" tyre will need a lift of some sort on a 15" wheel, but a 30x9.5 will be ok.

My understanding of the larger sidewall was it created a larger surface area when deflated equating to improved traction. Handling does change but I don't know of any specific guide to measure the difference in ride other than by feel/trial and error. (please correct if otherwise :))


Cheers!

Jason

[trobbo]

When fitting tyres to rims, manufacturers give you a range of recommended rims widths that can be used.

I like to squeeze the sidewalls in, to fit tyres onto a narrower rim rather than spread them out, to fit a wider rim.

A tyre on a narrower rim is less likely to fall off the rim at lower pressures. For example I run 34 x 10.5 tyres on a 7 inch rim and have never had problems with tyres falling off rims even at 10 or 12 psi.

Personally I would not put a 30 x 9.5 on an 8 inch rim as I think the risk of debeading the tyre is too great.

[2_door]

When fitting tyres to rims, manufacturers give you a range of recommended rims widths that can be used.

I like to squeeze the sidewalls in, to fit tyres onto a narrower rim rather than spread them out, to fit a wider rim.

A tyre on a narrower rim is less likely to fall off the rim at lower pressures. For example I run 34 x 10.5 tyres on a 7 inch rim and have never had problems with tyres falling off rims even at 10 or 12 psi.

Personally I would not put a 30 x 9.5 on an 8 inch rim as I think the risk of debeading the tyre is too great.

who makes a 34x10.5 tyre, its an unusual size. have you got a pic of it on the vehicle ? ;)