BigJimnyMeet (North) 2024 (12 Jan 2024)
14th July 2024
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Re:New Gen Jimny Tyre size
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Lambert wrote: Cars with low profile tyres are different to SUVs with high profile tyres. The standard fit for the gen3 is a 205 on a 5.5j rim. It is possible though difficult to find the recommended rim size for every single size of tyre from every brand as they are legally bound to provide it. As a general rule though the rim should be about 70pc the width of the tyre give or take ish.
So a 215 tyre which has a width of 8.46 x 0.70 (70%) = has a minimum wheel rim width of 6.4”
Just trying to understand this guys. Very ambiguous! Would be helpful if tyre manufactures stated a minimum rim width
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Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!
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I just wanted confirmation that I wouldn’t be stressing the tyre or at risk of de-beading whilst off-roading
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- Andy2640
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DAGZOOK wrote: Thanks lambert, that’s what I had thought. Many people on the forum have fitted larger tyres with no issues. I’m looking at 215/75/15’s which I think virtually all gen.4 owners have fitted with success.
I just wanted confirmation that I wouldn’t be stressing the tyre or at risk of de-beading whilst off-roading
I can highly recommend 215/75/15 - Toyo open country AT PLUS. The PLUS is their latest tyre, designed to be a happy compromise on/off road.
They have great grip off road, good wet cornering abilities, reasonably priced and have an aggressive look to them. They are also amongst the lighter weight AT tyres available.
As we have discussed before, the weight of the tyres plays an important factor in regards to 'blunting of performance' and 'fuel economy'
Ive said it before, but I can highly recommend these tyres, they have been great. Just a suggestion anyways.
Cheers.
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- iawra
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- Andy2640
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iawra wrote: I personally wouldn't mount anything wider than 195/80R15, the narrower the better for almost any purpose, probably except the looks. But I understand that to find a M/T for that size is quite difficult. The Toyo Open country A/T 195/80R15 is a very good option.
Speaking just for the gen 4 jimny in this situation, Im struggling to understand how 195's over 215's in all but snowy conditions would be a better choice. Surely more rubber in contact with the earth would be better in an off road enviroment.
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Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
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- iawra
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study
Another quote from Chris Scott (Sahara overland book 2004):
"...Note that it's the diameter or height of the tyres that makes the difference in sand, and not, as many imagine the width... For the desert, you want tyres with a high aspect ratio of around 80 because this represents a taller sidewall so corresponds to added ground clearance when firm, and a longer contact area when deflated"
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- Andy2640
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mlines wrote: For the same PSI, the area of rubber in contact with the road is the same on different sized tyres
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If ive not misundersrood something here (which incidentely happens a lot) then im all at sea with that statement.
So lets say we have a hypithetical and silly 415/75/19 tyre at 30 PSI. And conversely we have a 215/75/15 at 30 PSI.
Are we to believe that there will be the same "measured area of rubber on road" with both examples??
SCRATCH NOGGIN TIME
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It took me a long time to believe it and a very long argument that was only "proved" when I went and tried it.
Leaving aside the main variable factor that different tyres have different strength sidewalls (remember Denovo run flats?).
So based on similar construction tyres and a 1,135kg Suzuki Jimny,
A 1,135kg Jimny weighs 2502 pounds, or 625 pounds per wheel.
At 23 PSI of pressure then 625/23 is 27 square inches of tread on the road surface, note that the tyre size is not mentioned at all.
To prove it, drive your car onto a piece of white paper, then mark around the tyre and calculate the square inches of contact.
Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
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- Andy2640
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It essentially makes the 'area of tyre' touching the ground the same, regardless of tyre size.
Its hard to get ye head around, but yes i do get that now.
Thats a real head scratcher....and ive just had a major "Aahhhaaaaa moment".
Its another matter entirely though when a larger tyre is deflated for off road driving. Even a few PSI would make the larger tyre a major advantage due to 'tyre area on ground' being HUGE.
My head hurts
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Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!
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