Thread: Buying a D4...

Apart from the fact that it simply cannot be sensibly argued (as appears to be being posited) that a 19 is as good off road as a 16/17 (and for that matter an 18 but even 18 is too big), if it is about tyre choice doesnt that speak for itself then...about getting decent rubber...to get that you need the smaller rim.

There is at least one other thread on the D4 board about the problems with 19 inch rims off road. I am not the only one talking about it.

Cheers

We do a lot of sand driving here
2 things lower tyre pressure and momentum.

The hp of the 3.0 D4 should make it an absolute treat.

My 2 cents worth

Cheers

Originally Posted by Piddler

We do a lot of sand driving here
2 things lower tyre pressure and momentum.

The hp of the 3.0 D4 should make it an absolute treat.

My 2 cents worth

Cheers

Hi mate - couldnt agree more about tyre pressures and momentum. The problem with 19's is low pressure does not make much difference to the footprint and momentum cannot always be guaranteed (for example getting half way into a deep cutting and having someone come the other way)...and towing heavy with a 4wd sorts things about quickly in sand.

PPS. Dont get me wrong fellas, if I could have 16 inch wheels with plenty of profile height AND the 3.0 TTD I would be in utopia.

I will back ozscott re tyre profile and rim sizes.

Good as the D4 is with 19" wheels, it would be even better if it could take 17". Just as there is no substitute for cubic inches, there is also no substitute for high profile tyres....

Can't argue facts....

Sigh .... here we go again.

There is no argument that the D4 3.0 ltr would be better on 18/17/16/12" rims. HOWEVER - this is a fantasy - they don't exist.

The point (that I find I have to keep clarifying) is that in sand, the D4 3.0 ltr on 19" rims will outperform a D3 2.7 ltr on 17" rims. As will a D3 V8 on 19" rims. The 19" tyres are remarkably good in sand, and added to the huge difference in torque + better terrain response of the D4 3.0 ltr, this makes it a better sand package. OzScott seems to know better - I'm sure he's driven countless D3/D4's over sand and compared them.

I've never said that there are no issues with using 19" rims - you have to make allowances for them, especially in rocky terrain. I've fitted rim protectors to partially address that particular issue. And the tyre choice is rather restrictive. These are the reasons as to why I'm trying to source 18" rims. NOT because I'm scared of getting stuck in sand and needing OzScott's D2 to pull me out

Cheers,

Gordon

Originally Posted by ozscott

The problem with 19's is low pressure does not make much difference to the footprint and momentum cannot always be guaranteed

That's just not true - the 19" tyre has a larger radius of curvature, and will increase it's longitudinal footprint as quickly for the same reduction in tyre pressure. The width ('bulge') won't increase as quickly, but that doesn't contribute much to the footprint size.

Cheers,

Gordon

Originally Posted by gghaggis

These are the reasons as to why I'm trying to source 18" rims. NOT because I'm scared of getting stuck in sand and needing OzScott's D2 to pull me out

Cheers,

Gordon

Mate - even though you are grumpy with me I would still pull you out

Cheers

Originally Posted by gghaggis

That's just not true - the 19" tyre has a larger radius of curvature, and will increase it's longitudinal footprint as quickly for the same reduction in tyre pressure. The width ('bulge') won't increase as quickly, but that doesn't contribute much to the footprint size.

Cheers,

Gordon

Having aired down 19 inch low profiles on the beach versus 16 inch high profiles there is a massive difference in lengthening of footprint. Width is not that important - agreed on something!