Jimny 5-door tire size and gearing

Bigger tires give you clearance and grip, and they take away pulling power. On a roughly 100 hp engine carrying a full overland load, that trade matters. Here is how to pick a size and decide whether to regear.

The numbers below are for the JB74-generation 5-door. Check the sticker in your door jamb, because sizes and ratios vary by market.

Tire diameters compared, drawn to scale Three concentric circles: the stock 195/80R15 at 693 millimetres, a 225/75R15 at 719 millimetres, and a 245/75R16 at 774 millimetres. The largest is 81 millimetres taller than stock.
Drawn to scale. The stock tire is the dark disc. Going to 245/75R16 adds 81 mm of diameter.
  • 195/80R15 stock, 693 mm
  • 225/75R15, 719 mm
  • 245/75R16, 774 mm

Which size should you run?

Pick by how you travel, then check the details further down the page.

Weekend trails, mostly tarmac

215/75R15, no regear

Fits without a lift and adds a little clearance. The gearing stays close to stock, so the engine feels the same.

Loaded long-distance overlanding

225/75R15 all-terrain, no regear

The best balance for a heavy 5-door. Choose a reinforced or C-load tire and keep an eye on your weight.

Serious off-road build

30 in and up, lift and regear

Needs a lift, arch trimming, the right wheel offset and a regear to roughly 4.8:1, front and rear together.

Where the 5-door starts

The 5-door shares the 3-door's 1.5 L engine, stock tire and drivetrain ratios. It is roughly 100 to 150 kg heavier before you add any gear, and it has a longer wheelbase of about 2,590 mm against 2,250 mm. That extra weight is why it is more sensitive to tire diameter and load.

Stock tire
195/80R15, about 27.3 in (693 mm)
Final drive
about 4.3:1
Low range
about 2:1
Crawl ratio
roughly 31:1 on the 5-speed manual

Verify the exact ratios for your market and transmission before doing any regearing math.

Common upgrade sizes

Tire sizes compared with stock
Tire sizeDiameterVersus stockFitment on the 5-door
195/80R15 (stock)27.3 in / 693 mm-Fits as is
215/75R1527.7 in / 704 mm+1.5%Fits with no lift. The sensible first upgrade.
225/75R1528.3 in / 719 mm+3.7%Usually fits. Check for rubbing at full lock.
235/75R1528.9 in / 734 mm+5.8%Needs a lift and some trimming.
245/75R1630.5 in / 774 mm+11.7%Needs a lift, trimming and the right wheel offset.

Fitment depends on wheel width, offset, suspension height and local rules. Test-fit before you buy a full set.

What a bigger tire changes

  • Speedometer. Your real speed is higher than indicated by about the same percentage as the size change. With a tire 5.8% larger, a reading of 100 km/h means roughly 106 km/h.
  • Crawl ratio. It falls in proportion. A tire 11.7% larger gives up about 10% of your crawl ratio.
  • Highway driving. The engine works harder in top gear, so fuel use and heat go up.
  • Weight. Larger tires are heavier. Acceleration and braking both dull, and a loaded 5-door shows this sooner than a 3-door.

Work out your own tire

Enter the size printed on the sidewall. The results compare it with the stock 195/80R15.

mm
percent
inches

Stock figures used: 693 mm diameter, 4.3:1 final drive, 31:1 crawl ratio.

Diameter
-
Versus stock
-
Real speed at 100 km/h indicated
-
Crawl ratio
-
Regear target (final drive)
-

When to regear

  • Up to 225/75R15. No regear needed, even when loaded.
  • 235/75R15 up to about 29 in. Worth considering if you carry a full load or drive a lot of highway or mountain roads.
  • 30 in and above. Regear. Do the front and rear together.

To find a target ratio, multiply your stock ratio by the increase in diameter:

New ratio = stock ratio × (new diameter ÷ stock diameter)
For a 30.5 in tire: 4.3 × 1.117 ≈ 4.8:1. Choose the closest ratio your diff supplier offers.

Overlanding advice

All-rounder

215/75R15 or 225/75R15 in an all-terrain tire. You gain a little clearance and the gearing stays near stock.

Load rating

Choose a reinforced or C-load tire. Roof gear, fuel, water and passengers add up fast on the 5-door.

Sand

Air down to about 15 to 18 psi, and carry a compressor to reinflate afterward.

Mud and snow

A narrower tire usually cuts through to firmer ground better than a wide one.

Spare

Carry a full-size spare of the same diameter. Mixed diameters put stress on a part-time 4WD driveline.