Thread: 32s or 33s?

Originally Posted by PAT303

I don't think bigger tyres would hurt the Puma at all,as you'd know 1st low is lower than anything this side of a tractor. Pat

yeh 1st is out there on it's own, but travelling at 4klm for 50klm is no good either. Second is an awesome gear for crawling along in low.

It seemed to all of us LR have specked there vehicles very closely over the years regarding power, talk, and gear ratios. I presume since they all run the same transfer box this is partly why.
A puma donk for all it engineering and latest fuel delivery is no more economical, or not much more power than a TD5, or TDi.
In fact the puma was the one using more fuel than the others, maybe a bit heavier vehicle, maybe the air con on all the time.

Jason, interesting comment on 7.5R16's = 31". I have a set of 7.5R16's and 31x10.5R15's and the 7.5's are about 1.5 - 2" bigger in diameter than the 31". But that's just measuring them laying on the driveway.
Question guys - how do the 33's affect fuel economy compared to standard diameters? I've read that wider tyres also reduce economy quite a bit. Also, forgive my ignorance but what's the pyro?
cheers Gerald

It is hard to tell about the fuel economy because the speedo changes when you up in tyre size which throws out the distance travelled per tank. I havn't noticed any dramatic change though. But, just going by experience, in a standard tdi, I found I would be back to 4th earlier on some hills, but the overall improvement by going to 33's for outweighs this. As someone posted earlier they bring the engine rpm at 95 - 100km/hr down making for a much more enjoyable time on the highway.
I did however fit the maxi-drive 30% reduction gearset into the transfer case because I didn't want to lose any low range and the transfer case needed overhauling anyway. First low would seem to be on par with the Puma 130.
Cheers, Martin

Drover... Defer with 285's pictured...

Sorry, but I think the 7,50x16" are 32" . The 31" are the 7.00x16".

Originally Posted by newhue

who's 33 are you going with.

Leaning toward Mickey Thompson Baja MTZ's but BFG KM2's are also under consideration.

I have got quotes for KM2's - $350 ad Baja MTZ's - $359.

Price is much the same, any opinions on these brands/tyres ?

Originally Posted by newhue

ooo you wagon drivers, us utes or Defers without alloys have 7.5x16, which = 31"

who's 33 are you going with.

Despite the maths, 7.50s are 32".

Originally Posted by isuzurover

Despite the maths, 7.50s are 32".

It can also depend on the manufacturer.

When I bought the 130 it had half worn XZL's on the back and near new 235/85 Bridgey MT's on the front and from what I can remember there was something like a 3/4" difference in OD.
I did measure it at the time but it was ten years ago now.

The t/case fluid was a lovely colour and odour too