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31" tyres on a Gen 4

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17 Nov 2025 13:07 - 17 Nov 2025 13:32 #262781 by saxj
31" tyres on a Gen 4 was created by saxj
I've had 235/75R15's on for around 100000Km now, and it's time to change tyres.
I'm considering 31" tyres.

I have reduction gears in the t-case, so gearing is not an issue.
I have a 50mm lift, front radial arms are 15mm longer and aftermarket bumpers that give plenty of clearance for bigger tyres.
Besides possibly extending bump stops, is there anything else I need to consider?
Has anyone experienced driveline breakages with 31" tyres?
Last edit: 17 Nov 2025 13:32 by saxj. Reason: Not clear

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17 Nov 2025 13:26 - 17 Nov 2025 13:27 #262782 by 300bhpton
Replied by 300bhpton on topic 31" tyres on a Gen 4
235's.... 235/85R16? Or do you mean a 15" size?

JimnyBits have 31.10.50R15's on their website:


www.jimnybits.com/jimny-19-on/suspension...nsion-lift-kits.html

But that is on a 4" lift, so it runs extended bump stops to prevent the wheel moving up as far into the arch, along with longer shocks to give more total droop and travel.

I guess rim offset will also play a factor on how close or if they rub anything under steering or flex.

Interesting to see how you get on.
Last edit: 17 Nov 2025 13:27 by 300bhpton.

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17 Nov 2025 13:39 #262783 by saxj
Replied by saxj on topic 31" tyres on a Gen 4
The current tyres are 235/75R15's. I intend running the new tyres on the stock rims.

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17 Nov 2025 15:40 #262784 by 300bhpton
Replied by 300bhpton on topic 31" tyres on a Gen 4

The current tyres are 235/75R15's. I intend running the new tyres on the stock rims.
Certainly not saying don't do it. But probably worth noting that the rim range for a 31.10.50R15 is 7-9". So the stock 5.5" rim is well under spec.

 

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