Jeep Tire Size Calculator
Planning a lift? Get the gear ratio, crawl ratio, and lift height your Wrangler or Gladiator needs to run 33s, 35s, or 37s safely.
Quick Answer
A stock 2024 JL Sport on 245/75R17 (30.47″) fits 285/70R17 (32.71″) bolt-on — no lift needed. 285/75R17 (32.83″) fits the Rubicon's hi-clearance flares stock; Sport needs a 2″ lift. Re-gear at every meaningful upgrade: 4.10 gears for 33s, 4.56 for 35s, 4.88 for 37s. JL/JK/JT use 5×127 bolt pattern; TJ/YJ use 5×114.3.
| Model / Trim | OEM Size | Height | Stock Gear / Notes |
|---|---|---|---|
| JL Sport/Sahara (2018–2026) | 245/75R17 | 30.47″ | 3.45 — 33″ bolt-on |
| JL Rubicon (2018–2026) | 285/70R17 | 32.71″ | 4.10 — 35″ bolt-on |
| JL Rubicon 392 V8 | 315/70R17 | 34.36″ | 4.56 factory — 35″ OEM |
| JK Sport/Sahara (2007–2018) | 245/75R17 | 30.47″ | 3.73 — 33″ bolt-on |
| TJ Sport/SE (1997–2006) | 215/75R15 | 27.74″ | 5×114.3 — 33″ w/ 2″ lift |
| WK2 Grand Cherokee Trailhawk | 265/60R18 | 30.51″ | Air susp — 33″ max practical |
Re-gear formula: New Ratio = Old Ratio × (New OD ÷ Old OD). Community standard: 4.56 for 35s, 4.88 for 37s.
OEM Tire Size
285/70R17
Rear (if diff)
Same as front
Stock Gear Ratio
4.10
Bolt Pattern
5×127 (5×5″)
Rim Size (stock)
17×7.5
Generation
JL
Maximum Tire Size by Lift Level
Stock / No Lift
35″
2–2.5″ Lift
37″
3.5–4″+ Lift
38–40″
OEM Tire Dimensions — 285/70R17
Total Height
32.71″
Sidewall
7.85″
Circumference
102.76″
Revs / Mile
617
Model Notes
Locker-equipped; HC fender flares standard; best starting point for 37s
Load this model's stock size into the comparison tab:
| Model | Gen | OEM Size | Height (in) | Stock Gear | Bolt Pattern | Max (no lift) | Max (2–2.5″) |
|---|---|---|---|---|---|---|---|
| JL | 245/75R17 | 31.47″ | 3.45 | 5×127 (5×5″) | 33″ | 35″ | |
| JL | 255/75R17 | 32.06″ | 4.10 | 5×127 (5×5″) | 33″ | 35″ | |
| JL | 255/70R18 | 32.06″ | 3.45 | 5×127 (5×5″) | 33″ | 35″ | |
| JL | 285/70R17 | 32.71″ | 4.10 | 5×127 (5×5″) | 35″ | 37″ | |
| JK | 245/75R16 | 30.47″ | 3.21 | 5×127 (5×5″) | 32″ | 33″ | |
| JK | 255/75R17 | 32.06″ | 4.10 | 5×127 (5×5″) | 33″ | 35″ | |
| TJ | 215/75R15 | 27.70″ | 3.07 | 5×114.3 (5×4.5″) | 30″ | 31–32″ | |
| TJ | 245/75R16 | 30.47″ | 4.10 | 5×114.3 (5×4.5″) | 31″ | 33″ | |
| YJ | 205/75R15 | 27.11″ | 3.07 | 5×114.3 (5×4.5″) | 29–30″ | 31–32″ | |
| JT | 245/75R17 | 31.47″ | 3.45 | 5×127 (5×5″) | 33″ | 35″ | |
| JT | 285/70R17 | 32.71″ | 4.10 | 5×127 (5×5″) | 35″ | 37″ | |
| WJ | 235/65R17 | 29.03″ | 3.07 | 5×127 (5×5″) | 30″ | 31″ | |
| WK2 | 265/60R18 | 30.52″ | 3.07 | 5×127 (5×5″) | 30–31″ | 32″ | |
| KJ | 225/75R16 | 29.29″ | 3.07 | 5×114.3 (5×4.5″) | 29″ | 30–31″ | |
| KL | 225/60R17 | 27.63″ | 3.73 | 5×114.3 (5×4.5″) | 28″ | 29″ |
Click any model name to load its full specs above. Max sizes are typical community-vetted limits — results vary by offset, wheel width, and driving style.
How to Use This Calculator
- 1OEM Lookup. Select your Jeep model (JL, JK, TJ, YJ, JT, WJ, WK2) to load OEM tire size, diameter, bolt pattern, and stock axle gear ratio.
- 2Size Converter. Enter any metric code (285/75R17) or inch-format size (35×12.5R17). The calculator cross-converts, shows diameter, and displays a fitment badge.
- 3Gear Ratio. Enter your current tire diameter, proposed new diameter, and current axle ratio. Get the recommended new ratio and speedometer correction.
- 4Reverse Lookup. Enter a target diameter and rim size to find all standard metric and floatation inch sizes within ±1.5%.
- 5Crawl Ratio. Select your transfer case and transmission to compute your full crawl ratio chain and compare against the stock Rubicon benchmark.
Jeep Tire Sizing — Model-by-Model Guide
JL and JK share the same 5×127 bolt pattern. JK (2007–2018) and JL (2018–present) Wranglers plus the JT Gladiator all use 5×127 mm — wheels swap directly. The TJ (1997–2006) and YJ (1987–1995) use 5×114.3 mm and are not interchangeable without adapters.
Re-gearing is required for meaningful tire upgrades. The recommended formula is New Ratio = Old Ratio × (New OD ÷ Old OD). Going from stock JL Sport (30.47″) to 35-inch tires (33.83″) on 3.45 gears gives 3.83 — the available 4.10 gear is the correct choice. For 37-inch tires, 4.88 is the community standard.
JL Rubicon starts with a significant advantage. The JL Rubicon ships from the factory with 285/70R17 OEM tires, high-clearance fender flares, 4.10 axle gears, and Rock-Trac 4WD — giving it a head start of roughly 1.5 lift-kit sizes over the Sport/Sahara for large tire fitment.
Crawl ratio benchmark: 70:1+ for rock-crawling. Stock JK/JL Rubicon with Rock-Trac and 4.10 gears produces approximately 73–77:1 depending on transmission. Any upgrade path that reduces crawl ratio below 50:1 will be noticeable on technical trails.