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Jimny expert advice required - tyre size, transfercase *noob
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Author:  phantom snail [ Wed Oct 10, 2012 7:31 pm ]
Post subject:  Jimny expert advice required - tyre size, transfercase *noob
Hi guys,
just bought an auto Jimny and was hoping you guys can help me out - it is stock as a rock.
Im a noob, so my apologies ... I've read up a few posts but still my azn brain is not comprehending much =/

1 - Tyre size ...
I have purchased some sunraysia rims: 15x8 -23 offset
I was wondering what tyre size I should run? My mate runs 235 75 15 however he has had to modify his guards to prevent scrubbing and he has a 4" lift
I want to run tyres that will suite my jimny without touching my guards - will 215 75 15 suite? or 225 70 15 suite better? Or whats the smallest 15" all terrain tyre size I can run?
I have purchased an 80mm tough dog lift kit, but I'd like to run these rims with tyres prior to fitting the lift kit if possible ...

2 - Transfer case options ...
So I've been reading up about sierra transfer case options for guys running larger tyres? would i need to swap out my auto jimny transfer case for a sierra item? is it straight bolt up?
Atm im running the stock 205 70 15 tyre size and I find the revving a touch too high for my liking at cruising speeds ... would swapping to a sierra item sort this? what is the standard auto jimny case ratio? and is the sierra case ratio 4.1?

Appreciate the help and heads up guys :)
Author:  jimny_timmy [ Wed Oct 10, 2012 8:59 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
15x8 for a 235 is a little wide IMO... Better off with a 7" so that its more snug on the rim, and -23 will mean your tyre will hang out of the guard a fair way, mine hang out around 20mm and I'm running a similar size tyre (roughly 6mm difference in width) on a -12 15x7.

215 will fit on your standard rim, possibly 225 but don't quote me.

Not sure about the case swap in an auto, I know the auto case is lower than the ratio in the manual, so I you did the swap you'd most likely need to fit reduction gears to it.

Or you can get trialjimny gears to fit your current case, which would possibly work out around the same price as a wt ase swap + new gears for it, and less mucking around finding parts etc.


Hope this helps :)
Author:  kristov [ Wed Oct 10, 2012 11:00 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
jimny_timmy wrote:
215 will fit on your standard rim, possibly 225 but don't quote me.

225s are recommended for 6" rim but fit fine on standard and can run a low pressure without braking bead :D
Author:  Bugsta [ Thu Oct 11, 2012 1:27 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
8" is a little wide for a Jimny and definitely too wide for a 235. My 235 Fed's rolled off my 7's regularly at low pressures when I pushed it through mud.

On 8" rims you'd be wanting at least 245's and thats starting to get crazy wide on a Suzuki.

Phantom snail, it will help if you can first identify what your intended uses are for the vehicle. eg. Daily driver, cruising, weekend toy, hardcore/rock climbing etc.

Second, whats your budget? Is it a Suzuki owner's budget or have you got plenty to throw around?

Transfer cases: I'm going to assume its a late model 2006+ (?)
Jimny Manual H-1:1,L-2:1 with 4.3 diffs
Jimny Auto H-1.27:1,L-2.54:1 with 4.09 diffs
Trialjimny have 20%, 27% and 35% reduction depending on which box. They are about $1,000.

Sierra cases: There is plenty of info on this site about these boxes and and their gearing options

You will get over your dislike of the high reving once you put the 29" tyres on and start doing off road work. You will be wanting more revs. Also, many people report that the automatic transmissions are at their limit as stock, so you might want to install a transmision oil cooler before you go too far off road.
Author:  303zuke [ Thu Oct 11, 2012 2:21 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
Bugsta wrote:
Transfer cases: I'm going to assume its a late model 2006+ (?)
Jimny Manual H-1:1,L-2:1 with 4.3 diffs
Jimny Auto H-1.27:1,L-2.54:1 with 4.09 diffs
Trialjimny have 20%, 27% and 35% reduction depending on which box. They are about $1,000.

Sierra cases: There is plenty of info on this site about these boxes and and their gearing options

When websites like Trial Jimny flip figures round like 20%, 27% and 35%, it's a reduction from a stock figure. As the Jimny has a couple of different T/case ratios over different models and years and markets, it would be more helpful to get the ACTUAL ratio. For instance, as you have shown, the Auto Jimny ALREADY has the 27% gearing reduction compared to a Manual. The only option lower is the "35%", which would actually only give about 6% improvement (which would be about right for correcting 215/75-15 tyres from the standard 205/70-15) with no improvement for offroad work. Worth 800 Euros?In the case of an Auto, he might be better off looking for manual diff ratios rather than transfer gears, or go the whole hog and fit a Sierra case.

With the Sierra cases, gearsets are named by the actual ratio, so while the reduction quoted is relevant to 1.3 Sierra owners, the ratios can be used by owners replacing 1.0 Sierra cases, Coilys and Jimnys, all of which are different to 1.3 Sierra.

Who knows for sure what ratios TrialJimny are referring to, as the European market might very well be different to Aust Jimnys.
I don't think WE have even clarified what the T/C and Diff ratios are in the Aust market for each of Man and Auto Type 1, 2 , and 3 Jimnys, let alone UK, EU or JDM!!
Author:  Bugsta [ Thu Oct 11, 2012 2:45 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
Ok, I have made an assumption that we are talking about the Australian market (reasonable being this is the AZ forum) and I have noted an assumption that he owns a late 06+ Jimny as the OP did not state. I am sure he will correct this if its not.

Stock figures yes. I neglected to specify that these options were for the manual box, but did say 'depending on which box' as I had not checked back on the TJ site at that time. In fact they do have a 20% reduction (from stock of the auto box) for the auto box, which would be his only option without changing it. This would be more than enugh for 29's and still quite a reasonable solution for 30's or 32's even.

I was not suggesting he change from an auto to a manual box, which is how you arrive at the 6%.

PN: I have seen a few people do a manual gear box conversion. Keeping the auto box will give you a nice 27% reduction. Bear in mind that the auto boxes have a narrower chain than the manual boxes, so I expect they would stretch a little quicker. I had one in with my 32's and it was amazing. The chain slipped after a day unfortunately.
Author:  jimny_timmy [ Thu Oct 11, 2012 3:53 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
303zuke wrote:
Bugsta wrote:
Transfer cases: I'm going to assume its a late model 2006+ (?)
Jimny Manual H-1:1,L-2:1 with 4.3 diffs
Jimny Auto H-1.27:1,L-2.54:1 with 4.09 diffs
Trialjimny have 20%, 27% and 35% reduction depending on which box. They are about $1,000.

Sierra cases: There is plenty of info on this site about these boxes and and their gearing options

When websites like Trial Jimny flip figures round like 20%, 27% and 35%, it's a reduction from a stock figure. As the Jimny has a couple of different T/case ratios over different models and years and markets, it would be more helpful to get the ACTUAL ratio. For instance, as you have shown, the Auto Jimny ALREADY has the 27% gearing reduction compared to a Manual. The only option lower is the "35%", which would actually only give about 6% improvement (which would be about right for correcting 215/75-15 tyres from the standard 205/70-15) with no improvement for offroad work. Worth 800 Euros?In the case of an Auto, he might be better off looking for manual diff ratios rather than transfer gears, or go the whole hog and fit a Sierra case.

With the Sierra cases, gearsets are named by the actual ratio, so while the reduction quoted is relevant to 1.3 Sierra owners, the ratios can be used by owners replacing 1.0 Sierra cases, Coilys and Jimnys, all of which are different to 1.3 Sierra.

Who knows for sure what ratios TrialJimny are referring to, as the European market might very well be different to Aust Jimnys.
I don't think WE have even clarified what the T/C and Diff ratios are in the Aust market for each of Man and Auto Type 1, 2 , and 3 Jimnys, let alone UK, EU or JDM!!

Trialjimny do a set of gears in the following:

98-05 or non VVT:

24% (only one set, don't know if jimnys came in an auto during this period? I'd assume they did.

05-12 or VVT:

20,27 & 35% M/T

20 & 27% for all diesel models, which are useless to us

24% for A/T


I'm not sure on the diesel ratios but there may be a chance that fitting these to a VVT will give less than a 20% reduction but I have no idea, just throwing it out there for someone with the knowledge to confirm :)
Author:  phantom snail [ Thu Oct 11, 2012 7:21 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
Thanks for the info guys

Bugsta - indeed I have an 07 jimny ... and its great to find out that I have the reduction already since it's an auto ... so I guess I wont need the case or reduction gears after all ...
In regards to use, it will be used maybe 2-3 days a week with the occasional sunday bashing here n there ... it wont be a hardcore offroader, but ill be doing whatever/wherever my mate takes me ... could be bush bashing, mud swamps, or sand dunes?

Yeap, I'm looking into the auto transmission cooler which will be done at the same time the m18 goes in :)

I purchased 215 75 15 tyres today as the 235 75 15 tyres could not fit ... they scrubbed the front bumper bar and did not clear at all ... the 215 75 15 JUST clear the front bumper bar by about 5mm on turning ... how low in tyre pressure can I go without risking the tyres slipping off? 25psi?
Author:  jimny_timmy [ Thu Oct 11, 2012 7:35 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
You don't have reduction as your diff ratios are different.

The tyre placard states 26 as the recommended in road pressure. I've successfully run 7psi on the beach with 205/70, but you shouldn't need to go past 10 really
Author:  phantom snail [ Thu Oct 11, 2012 8:18 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
jimny_timmy - im assuming you ran 205/70 on the stock 5.5" rim width? Unfortunately for me, im running 215/75/15 on 8", and im pretty certain running 10psi on that would cause the tyre to come off lol

26psi is the standard road pressure?! Wow ... I'm currently running 36psi for on road ... should I be running less?
Author:  31zook [ Thu Oct 11, 2012 8:25 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
Grab some smaller/stock rims and run the tyres you got now... Must have some awesome looking streeeeeeeech with that combo.

Pic? :D
Author:  jimny_timmy [ Thu Oct 11, 2012 8:30 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
phantom snail wrote:
jimny_timmy - im assuming you ran 205/70 on the stock 5.5" rim width? Unfortunately for me, im running 215/75/15 on 8", and im pretty certain running 10psi on that would cause the tyre to come off lol

26psi is the standard road pressure?! Wow ... I'm currently running 36psi for on road ... should I be running less?


Correct I was... I'm surprised someone fitted 215's to 8" rims? I'd be careful running even 26 in them!

I have some stock alloys, pm me if interested.
Author:  atari4x4 [ Thu Oct 11, 2012 8:36 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
what ever tyre shop fitted those tyres to those rims should be shot :lol:
Author:  phantom snail [ Thu Oct 11, 2012 8:43 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
31zook - shall make a members post in the rigs of auszookers soon :)

jimny_timmy - I have the stock rims, but I like the look of my sunraysia's =/
mmm so itll come right off at anything below 25?

atari4x4 - LOL .. damn .. does that mean im just gonna bog in sand dunes and muds?
Author:  jimny_timmy [ Thu Oct 11, 2012 8:48 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
phantom snail wrote:
31zook - shall make a members post in the rigs of auszookers soon :)

jimny_timmy - I have the stock rims, but I like the look of my sunraysia's =/
mmm so itll come right off at anything below 25?
atari4x4 - LOL .. damn .. does that mean im just gonna bog in sand dunes and muds?


Mate do yourself a favour and get those tyres and rims off your jimny! Swap the tyres to a 15x5.5-6

It dangerous bud and we'd all hate to see you or someone else get hurt!
Author:  phantom snail [ Thu Oct 11, 2012 9:15 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
jimny_timmy wrote:

Mate do yourself a favour and get those tyres and rims off your jimny! Swap the tyres to a 15x5.5-6

It dangerous bud and we'd all hate to see you or someone else get hurt!


I understand where you are coming from, and I'm happy to run 28-30psi through the tyres for road use to make it more safer ... but I like the rims and the way they sit on the car - its not a 4wd action beast, just a fun toy to be enjoyed on some wkends for abit of adventure?
Author:  Teracis [ Thu Oct 11, 2012 9:21 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
phantom snail wrote:
jimny_timmy wrote:

Mate do yourself a favour and get those tyres and rims off your jimny! Swap the tyres to a 15x5.5-6

It dangerous bud and we'd all hate to see you or someone else get hurt!


I understand where you are coming from, and I'm happy to run 28-30psi through the tyres for road use to make it more safer ... but I like the rims and the way they sit on the car - its not a 4wd action beast, just a fun toy to be enjoyed on some wkends for abit of adventure?


You can still get narrow rims with large offset, these boys don't just say take them off to be the fun police, just have them fitted to rims that suit the tyre. You will go a LOT further offroad if you can air down so that the tyres will do their job and not just walk straight off your rims!
Author:  atari4x4 [ Thu Oct 11, 2012 9:24 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
should have bought a jap import silva if you wanted to stretch tyres & be in with the stanceworks/image class racers
Author:  jimny_timmy [ Thu Oct 11, 2012 9:42 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
Rhinoperformnce...
Author:  31zook [ Thu Oct 11, 2012 11:59 pm ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
I ran 235s on an 8" rim 8) if I could get a decent set of magnums I would run HT's and streeeech :D
Author:  303zuke [ Fri Oct 12, 2012 5:12 am ]
Post subject:  Re: Jimny expert advice required - tyre size, transfercase *
Bugsta wrote:
Ok, I have made an assumption that we are talking about the Australian market (reasonable being this is the AZ forum).

I'm certain the OP is in Aust too, but TrialJimny are Italian and Jimnybits are in the UK. So when they talk about 20, 24, 27 or 35% reduction, what ratios are they talking about?????? Even APIO, with it's 58% kit may not actually pan out to be that figure if the JDM 660 Turbo Jimnys have different ratios to the Aust 1.3 Jimnys. The point I'm making is that a percentage is not really helpful if you don't know the original ratio, while an actual ratio is more useful when comparing set ups or using gearing calculators.
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