Im lookimg to buy offest rims and tires for my automatic STOCK jeep wrangler sport. I do go offroading, id like something more aggressive. What size tires and rims can I get with 3.21 gear ratio? Ive read the chart, it doesnt touch on offset rims and I know it makes a difference.
Depends on how big of tire you want, but I wouldn't go any larger then a 33 with 3.21 gears and even that will be pushing it. The widest you can go is 285 on the stock wheels and you'll probably get some rubbing when the wheels are turned lock to lock. Many here go to a 4.5 back spaced wheel, including myself this way you can go to a much wider tire such as 12.50 without any issues.
The other issue you may get is the tires rubbing the fenders while off road if you stay at the stock height. I would look at a leveling lift at least as it will give you the clearance you need while of road and your Jeep will look much better.
I had 285/70/17 on my previous 2012 w/ 3.21 gears. SUCKS offroad especially on inclines. when my group was on 4hi, I had to compensate by going 4lo. I usually end up with higher than normal temps and lag behind.
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I havent had any troubles on inclines, and generally have it 4lo anyways. So offset rims on 30s will work? And is it that different to have a leveling lift over a full lift kit? Besides adjusting the gear ratios and so on?..... FML this is redic. Should have just spent the extra 10k so I wouldnt be confused all the time. :/ lol. I love being dirty, but im not a car guy so all of this is french to me. Especially when no two answers are alike.
30's are small other than the very basic sport model that comes with 29's all others are 32's. If you run 30's you wouldn't need a lift or 4.5" back spaced wheels unless you just want to move the tires out more towards the fenders.
I'll give you an idea of what I run, 33's (305/70/16) on 4.5" back spacing and 8.5" wide 16" wheels. I also have the Teraflex leveling lift that is perfect for 33's, gives just enough clearance for the tires without rubbing while off road even when disconnected.
My tires are General Grabber AT2 and are a fairly aggressive all terrain, I had the 32" BFG Mud Terrains prior to these and I haven't noticed a hit on MPG even though my current tires are quite a bit larger especially width (2.5") wider. If you go to a similar tire size as me in a Mud Terrain you will probably take a hit in fuel economy and they are not the best on packed snow and ice as most are not siped and seeing you are from Ontario as well you may want to look at a tire that performs well in winter such as what I have (they are a severe winter rated tire) or perhaps a Goodyear Duratrac which is also good in the snow and fairly aggressive looking.
Yes I've been off road with my tires and they perform really well, but if you want to go into deep mud then a mud terrain is your best bet. I've gone in some mud but I have never been in really deep mud nor would I, it's too hard to get that crap off the Jeep once done.
The amount of flex without rubbing depends upon your tire size and lift, not the kind of tire you have. If you go to a 33" tire with no lift you will get rubbing off road especially while disconnected. If you get a leveling lift or taller you'll be fine even disconnected with 33's regardless whether they are all terrains or mud terrains.