Axle Trussing and CV's for 30"

So much to take apart here. If you are determined to have taller tyres then you will have to accept that even with gears it's not going to behave like a standard jimny. It will be noticeable that you have increased the rotating assembly weight and moved it further from the centre of rotation of the axle which is going to detract from the handling, acceleration and braking on road. Along with that you not unreasonably are looking at trusses to save a weld on the axle case failing because that's inevitable if you have any ambition off road with big tyres but it comes hand in hand with a further unsprung weight penalty which you will notice on road as without absolute cutting edge race suspension you will be making the suspension work very hard as you alter the ratio of sprung to unsprung mass. Minefield.

iac27 wrote:

Thanks for checking. They're about the same 46 and 47. I'm down for a thinner tire but do you have any insight if a load ratting of 110 would still feel ok on road? As well as pushing a 46lb tire?

Honestly I don't know. I'll check what is on my Jimny in terms of load rating as I don't know what it is off the top of my head. I'm running 235/75R15 (28.9" tall), but I also have some nice adjustable shocks, so it rides and handles better than a stock JB74w.

I hear you. I don't want to add more mass to a 1.3L engine. Sounds like I can skip the trusses. Keep the tires close to 30" and try to find as skinny as possible in a lighter load rating.

Yes you can skip trusses but you then have to drive with a little decorum. It also depends on where you imported the car from as to the general condition of the under side. If it's a European model then it's probably had 20 years of seasonal salt applied to it so a trusses would help greatly in restoring some strength though it won't do anything for corroded mounting points. On the other hand if it's a salt free Japanese one then you may well get away with out trusses for quite a while before the stress of the bigger tyres causes problems. Ultimately it's an insurance and it's upto you to decide if it is worth it for your intended use. I probably would on an older car I was intending being ambitious with.

I see it like this no truss no diff guard 
Axles casings are not rare atm
But if you're thinking of jumping the Jimny then yes truss it up and add hydraulic bump stops 

Has for tyres 225 75 16 or 205 80 16 

I have ET0 wheels and bearing life is good 

Yes, this makes sense. No jumping and I do drive with care. The vehicle is in excellent condition as it's salt free from Japan.

@jackonlyjack what's the load rating of your tires? Does it ride ok on road?