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235/75R15 on JB74....

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26 Jun 2021 00:03 #236153 by Navigator
235/75R15 on JB74.... was created by Navigator
Propose putting Cooper Discoverer AT3 4S 235/75R15's on a new JB74. Interested to hear any observations on this - especially from real life experience of the size if not the brand. Considerable chatter on various blogs suggest this is a bridge too far. Others say it's fine, and suggest impact on performance and fuel economy, while clearly evident, are manageable/acceptable. These tyres do not have a particularly aggressive tread but they are obviously considerably larger, and heavier, than the standard issue ( in Oz) of 195/80R15. The vehicle is about to have a 45mm lift, so about 2 inches, more for GVM impact than the lift per se, so the tyres will certainly fit - on 7" aftermarket rims - but the principal concern is whether the increased weight/rolling resistance is too much to ask of the motor and other components. Appreciate any input.

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27 Jun 2021 00:44 #236169 by Navigator
Replied by Navigator on topic 235/75R15 on JB74....
Navigator again on this. Subsequent to post came across a considerable discussion on this precise size for JB 74 on BigJimny - and it only heightens my interest in informed input: Various views expressed in the discussion that mirror what I have said in post above: Some say regearing needed. Others say not. Prepared to put up with need to be more mindful of tyre influence when in low range - and when tackling, especially, steep gradients. Also relatively content with some reduction in fuel efficiency - but remain much interested in feedback on whether this proposal likely to have significant negatives for vehicle overall.

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28 Jun 2021 08:22 #236198 by 300bhpton
Replied by 300bhpton on topic 235/75R15 on JB74....
I'm running a 215/75R15 AT's on mine. I'd say it has had a significant knock on performance and mpg vs the factory fit tread and size.

I don't think I'd want to go bigger without potentially re-gearing and maybe a bit more power. Although it is hard to know if the next size up would have much more of an impact or not. But I suspect it would.

I think with a 235 your low 1st crawl speed would suffer too.

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28 Jun 2021 08:58 #236202 by saxj
Replied by saxj on topic 235/75R15 on JB74....

Navigator again on this. Subsequent to post came across a considerable discussion on this precise size for JB 74 on BigJimny - and it only heightens my interest in informed input: Various views expressed in the discussion that mirror what I have said in post above: Some say regearing needed. Others say not. Prepared to put up with need to be more mindful of tyre influence when in low range - and when tackling, especially, steep gradients. Also relatively content with some reduction in fuel efficiency - but remain much interested in feedback on whether this proposal likely to have significant negatives for vehicle overall.
I have 235/75R15 Muddies on mine. Off-road they are great, and wouldn't change them for anything, they handle even the steepest gradients without any issues. I drove home from a trail yesterday at 75mph,  with no issues at all, except for the fuel consumption which is around 20mpg . 

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28 Jun 2021 09:05 #236204 by Roger Fairclough
Everything you will read will be negative except possibly the aesthetics and/or the ground clearance.
Is this why you want to do it?
Aesthetics are personal and not open for discussion. Ground clearance increase will be nominal and only you can decide if the cost outweighs the benefit.
The negatives are legion, reduced braking efficiency, acceleration, top speed. Probability of bodywork touching, need to re-gear, extra wear on mechanical items, desire for more power to compensate for reduced performance, reduced stability.
There is a lot to consider.

Roger

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28 Jun 2021 10:41 #236207 by saxj
Replied by saxj on topic 235/75R15 on JB74....

Everything you will read will be negative except possibly the aesthetics and/or the ground clearance.
Is this why you want to do it?
Aesthetics are personal and not open for discussion. Ground clearance increase will be nominal and only you can decide if the cost outweighs the benefit.
The negatives are legion, reduced braking efficiency, acceleration, top speed. Probability of bodywork touching, need to re-gear, extra wear on mechanical items, desire for more power to compensate for reduced performance, reduced stability.
There is a lot to consider.

Roger
20mm may not sound like much, but in real terms it makes a massive difference. 

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