BJ40/42 maximum tyre size

Submitted: Monday, Jul 26, 2004 at 21:53
ThreadID: 15040 Views:3741 Replies:4 FollowUps:4
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Would anyone happen to know what the maximum tyre size height/width etc is for a standard (no suspension changes) bj40/42 without having to modify the speedo, axles, suspension, panels etc.

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Reply By: Truckster (Vic) - Monday, Jul 26, 2004 at 22:10

Monday, Jul 26, 2004 at 22:10
Legally or otherwise?

15mm increase legally.
AnswerID: 69797

Reply By: fateddie54 - Monday, Jul 26, 2004 at 22:11

Monday, Jul 26, 2004 at 22:11
Gday Torskin,
It will depend on the type of driving your doing and also the condition of your springs, my FJ40 had some pretty soggy springs, ran fine with 31x10.5 on and off road, put 33x12.5 on and was fine on road, however offroad they were rubbing on the body on each corner. This is with some rear arch cutting too.
Hope this helps.
AnswerID: 69798

Follow Up By: Torskin - Monday, Jul 26, 2004 at 23:53

Monday, Jul 26, 2004 at 23:53
Ok, if i replaced the suspesion with say ARB's OME suspension and shockers would i have trouble with body rub offroad with tyres at 33x12.5?

Now also forgetting about rims what would be the best size tyre from BF Goodrich from their All-terrain to place on it the 40/42 series?

Sorry the question is somewhat vage, but i am looking for a good quality brand All terrain tyre that won't require chopping, cutting, recalabrating etc of anything on it. I will then match the rim to fit the tyre, hopefully.

Thanks all
FollowupID: 330051

Follow Up By: fateddie54 - Tuesday, Jul 27, 2004 at 13:50

Tuesday, Jul 27, 2004 at 13:50
Thats the exact option i went for too... Full OME system in my opinion is fantastic! On and offroad performance is magnificent. I put 33x12.5 BFG A/T on and had great fun in the hills. I did still have trouble with body contact though-surprsing as it may sound my brand new tyres copped a bit gashing from the lip under the front arches-not too happy-however this is a tribute to the articulation you can get from the OME system. Having said this there are options, you can roll the lip back under the arch, i think this will eliminate most of the troubles. However to fully solve the problem i went for a body lift-gets everything out the way.
Rim sizes are up to you-there are some restrictions as to max width etc, prices vary for heights. I went for the standard R15, ive had no troubles.
You will however notice a fair power decrease with the taller tyres however. They provide a bit more leverage from the road, and as such your uphill cruising ability will be compromised-you may notice this even more with the diesel...
Hope we're narrowing the decision!
FollowupID: 330092

Follow Up By: Truckster (Vic) - Tuesday, Jul 27, 2004 at 14:11

Tuesday, Jul 27, 2004 at 14:11
Your brakes will also be affected, with larger rolling diameter, your brakes will be worse, if thats possible on a 40!

The other thing is you will need an engineers cert to be legal with 33x12.5's and/or a body lift.
FollowupID: 330095

Reply By: Well 55 - Tuesday, Jul 27, 2004 at 08:31

Tuesday, Jul 27, 2004 at 08:31
You may find a BJ will struggle with 33" tyres, where as 32/11.5/15 will be ok, and no need to alter speedo drive. But you will need new springs & shocks to make life easier.
AnswerID: 69824

Reply By: Torskin - Tuesday, Jul 27, 2004 at 14:39

Tuesday, Jul 27, 2004 at 14:39
thanks for answering guys (and gals?)

when the BJ's 40/42 ('81 - '83 years) what was the rim size and the tyres they had? any idea?

AnswerID: 69881

Follow Up By: Utemad - Tuesday, Jul 27, 2004 at 16:22

Tuesday, Jul 27, 2004 at 16:22
Just guessing here but I would have thought split rims with 7.50x16in tyres.

FollowupID: 330113

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