Hummer H2 biggest tire size: stock and lifted
The biggest tire owners run on a AM General Hummer H2 at every lift height, with the trimming it takes, the wheel specs you need and the lift kits that get you there.
Owners agree on 37x12.50R17 on stock wheels, or wheels with the same offset. One owner runs Cooper STTs at stock height with a slight torsion-bar crank and doesn't rub at full stuff, apart from a light scrub on the sway bar at full lock, which the stock 35s do too. 37x14.50s didn't fit. Wider tires or different offsets need a lift, spacers or both.
Biggest Hummer H2 tire at every lift
| LIFT | BIGGEST TIRE | WHAT IT TAKES |
|---|---|---|
| Stock | 37x12.50R17 | On stock wheels or the same offset. One owner runs them at stock height with a slight torsion-bar crank and doesn't rub at full stuff, apart from a scrub on the sway bar at full lock (stock 35s do the same). 37x14.50s didn't fit. |
| ≈2 in (leveling / torsion keys) | 38 in | One owner runs 38s with no lift and a leveling kit; another used GM's 'green' torsion keys to gain about 2 in up front for 38s. Owners warn cranked torsion bars ride harder and wear the steering linkage faster. |
| 4 in suspension (+1 in body) | 37–38 in | Owners report 37s on a 4-in Rancho lift with a 1-in body lift, and 38-in Mickey Thompson Baja MTZs on a 4-in Rancho. |
| 6 in | 40x13.50 | Fabtech 6-in lifts on 40s are common. Owners recommend wheels with 4.5-in backspacing. The lift drops the torsion bars and crossmember lower under the truck. |
Hummer H2 wheel and tire specs
| Factory tire sizes | LT315/70R17 (GM 2003 spec sheet; about 35 in) · 325/50R22 (22-inch factory option, per Limitless Tire) |
|---|---|
| Bolt pattern | 8x165.1 (8x6.5") |
| Center bore | 117 mm |
| Lug thread | M14x1.5 |
| Lug-nut torque | 140 lb-ft (190 N·m) |
Lift kits, wheels and tires for the Hummer H2
The H2 sits nose-down from the factory. A leveling kit or torsion-bar keys raise the front for 37s. Owners run 40s on 6-inch lifts with 4.5-inch-backspace wheels, but suspension lifts drop the torsion bars and crossmember lower under the truck.
Regear to 4.56 for 37s or 4.88 for 38s and up, and add a front locker while the diff is apart. Retune the computer afterwards.
One owner says a stock-height H2 'hits everything on the trail with the front skid'. Steel bumpers and sliders take the abuse instead, and leveling the truck helps.
Do you need to re-gear?
Owners say the stock 4.10s with 37s feel gutless on the highway and the transmission keeps hunting for gears. 4.56 restores roughly stock feel on 37s; 4.88 suits 38s or bigger and towing. Expect to retune the speedometer and shift points afterwards. Owners were quoted $1,900 to $4,800 for both axles.
Fitment comes from owners and specialists; wheel width, offset, trimming and bump stops change what fits. Check clearance at full lock and full flex before you buy. Some links are affiliate links.