29 or 30 Inch tyres ???

[NJPAJ]

Hi All,

I'm after some 29 or 30 inch muddies and wheels for my WT Sierra and have put up a post for them in the Wanted section.....

Just have a question though.

Will either of these sizes be fine with my standard diff ratios (3.7) ?

I'd prefer not to change them, but would like to have the largest possible tyres.

Any help would be much appreciated.

Cheers,
Daniel

[alien]

if you're doing sand driving then its ok - but anything highway speeds or requiring low speeds will be tough going.

best to look at tcase gears and go 31's... (most 31's measure more like 30).

anything above about a 28" is going to start wanting gearing addressed.

[NJPAJ]

Thanks mate,

Might keep hunting for only 29" muddies if thats the case as I would like to be able to trips on the highway.

[Moph]

I run 235/75R15 Goodyear MTRs (about 28.6" from memory) on stock gearing and it is very happy on the highway. Sits generally on 110kph @ 3400rpm (foot flat or just about) but struggles in a headwind. I do run premium and have the ignition advanced a bit though - can only hit about 100kph on unleaded with stock timing.