70 series tire size question

[BCDan]

Hey all,
new to the forum, tried searching old threads to find the answer to this but no luck, could have something to do with my computer skills.

here's my question:

i have a stock 1985 BJ70, hoping for an OME kit in the near future here, and trying to decide on new tire size from 31-33.

anything anyone can give info on is much appreciated, fuel economy, handling, any other experiences you've had with different tires on a 70 etc...

i'm staying with all terrains, just needs to get me around in the city and on logging roads etc so no need for MT's. i'm pretty much broke and so mostly wondering if going up to a 33 from stock size is going to break the bank for diesel economy, or if it wont change it too much.

any info much appreciated! cheers

dan

 

[David*BJ70]

1985 BJ70 - 32" : my average since january : 12,3L/100km (w/very cold outside temp and hot outside temp) . Best : 10,7L/100km - Worst : 13,7L/100km.

Handling : as good as a BJ70 can do with bigger tire

Experience : bigger the tire are... bigger is your power lost. Bigger than 32", you will lose your 5th except on highway.

If you go for the 33" tire... get a skinny tire like BF A/T 33-9.5-15.

 

[wesintl]

I think with ome that a 33x10.5 is perfect.

I would also swap out the 3.7 gears for a 4.11 chunk or 5th is going to be pretty worthless.

 

[Gold Boy]

16/85/235 10ply Roughrider M+S

 

[BCDan]

thanks guys,

if i go with the 33" tire is there a need to go to a 4.11 or is stock alright?

 

[albertom]

How about running OME and 33x12.5 with a 3F engine... too much? im running 32x11.5 rite now, but thought it might look too small with the lift on...

PD. Im 2600 meters above sea level, so my car isn't really a rocket anyway!

 

[seapotato]

I ran 255/85/16's on my 70 with 373's, and yep, was a bit slow. switched to 411's and it defiately perked it up.

now I have just a set of 31's on it with the 411's and the gearing is definately a bit low. 5th gear on back roads...

 

[bj70_guy]

33s with 3.70s is going to suck. I'm running 255/85R16s with 4.56s and it's about right, IMHO.

 

[nickw]

I have a 255/85/75 (33x10.5) BFG mud terrain (winter tire is the same size) on my BJ74 with 4.11s (and H55 5 speed)

Its about perfect for power (with a turbo) and gear ratios.
Has good of craw ratio, and good highway.
Its not a rock crawler, nor a sports car.
But a very good balance for inbetween.

Good on the hightway, and good in the offroad.

Cheers,
Nick

 

[Entaran]

My old FJ73 ran 33x12.5 15's on 15x8 rims with 4.11 lockers front and rear (mechanical, not airlockers). Used to do fine in pretty much every circumstance with the old 3F donk. Would happily hold 110 on the highway and could crawl, just didn't like going DOWNHILL in lowrange Petrol engines have no compression braking :/