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Hummer H2 tire upsize & plus-size guide

Every safe upsize, plus-size, wider, and winter-narrower option for the Hummer H2; covering its factory tire size, each inside the ETRTO ±3% overall-diameter tolerance, with speedometer impact and catalog availability per size.

By Mark Bishop · Last verified 2026-05-17 · Hummer H2 fitment specs

This guide takes the factory tire size of the Hummer H2 and shows every geometrically valid alternative; the plus-sizes that fill the wheel arch, the wider sizes that add grip, and the narrower winter sizes that bite through snow. All math is derived from the ±3% ETRTO safe-fit rule, not scraped listings.

315/70R17; factory fitment (2002–2009)

Overall diameter 872.8 mm (34.36 in). Alternatives below are grouped by upgrade intent; every one is inside the ±3% safe-fit envelope for this size.

Plus-1 (next rim size up)

Plus-1 keeps overall diameter constant while bumping rim diameter by one inch and dropping aspect ratio by ten points. The standard daily-driver upgrade; sharper steering response, mild ride penalty, modest tire-cost premium.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
345/60R18 871 -0.18% 59.89 mph Safe -
295/70R18 870 -0.30% 59.82 mph Safe Yes
315/65R18 867 -0.70% 59.58 mph Safe -
325/65R18 880 0.79% 60.47 mph Safe -
305/70R18 884 1.31% 60.78 mph Within tolerance -
285/75R18 885 1.36% 60.82 mph Within tolerance -
335/60R18 859 -1.56% 59.07 mph Within tolerance -
285/70R18 856 -1.90% 58.86 mph Within tolerance -
305/65R18 854 -2.19% 58.69 mph Within tolerance -
335/65R18 893 2.28% 61.37 mph Within tolerance -
315/70R18 898 2.91% 61.75 mph Within tolerance -
325/60R18 847 -2.93% 58.24 mph Within tolerance -

Plus-2 (two rim sizes up)

Plus-2 lifts rim diameter by two inches with a twenty-point aspect drop. Noticeable ride penalty, higher pothole risk, and a meaningful tire-cost premium. Suitable for performance trims and aesthetic upgrades.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
325/60R19 873 -0.02% 59.99 mph Safe -
305/65R19 879 0.72% 60.43 mph Safe -
295/65R19 866 -0.77% 59.54 mph Safe -
285/70R19 882 1.01% 60.60 mph Within tolerance -
345/55R19 862 -1.23% 59.26 mph Within tolerance -
335/60R19 885 1.35% 60.81 mph Within tolerance -
315/60R19 861 -1.40% 59.16 mph Within tolerance -
315/65R19 892 2.21% 61.33 mph Within tolerance -
285/65R19 853 -2.26% 58.65 mph Within tolerance -
335/55R19 851 -2.49% 58.51 mph Within tolerance -
295/70R19 896 2.61% 61.57 mph Within tolerance -
345/60R19 897 2.73% 61.64 mph Within tolerance -
305/60R19 849 -2.77% 58.34 mph Within tolerance -

Same rim, wider footprint

Same rim diameter as your OEM, just a wider footprint. Increases grip and footprint contact at the cost of fuel economy and steering effort. Confirm fender clearance at full lock before purchase.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
335/65R17 867 -0.63% 59.62 mph Safe -
345/65R17 880 0.86% 60.52 mph Safe -
325/70R17 887 1.60% 60.96 mph Within tolerance -
325/65R17 854 -2.12% 58.73 mph Within tolerance -

Winter / narrower contact

Narrower than OEM, aspect ratio raised to preserve overall diameter. Higher contact pressure improves snow and slush bite; the Nokian-style rule of one width step down for winter on the same overall diameter.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
295/75R17 874 0.17% 60.10 mph Safe -
295/80R16 878 0.64% 60.38 mph Safe -
305/75R16 864 -1.02% 59.39 mph Within tolerance -
285/80R16 862 -1.19% 59.29 mph Within tolerance -
285/75R17 859 -1.55% 59.07 mph Within tolerance -
305/70R17 859 -1.60% 59.04 mph Within tolerance -
285/80R17 888 1.72% 61.03 mph Within tolerance -
305/75R17 889 1.89% 61.13 mph Within tolerance -
285/85R16 891 2.07% 61.24 mph Within tolerance -
305/80R16 894 2.47% 61.48 mph Within tolerance -
295/75R16 849 -2.74% 58.36 mph Within tolerance -

Other geometric alternatives

Geometrically valid alternatives that don't fit a named category. Often combinations of rim and aspect change that happen to land in tolerance.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
335/70R16 875 0.30% 60.18 mph Safe -
305/80R15 869 -0.44% 59.74 mph Safe -
325/75R15 869 -0.49% 59.70 mph Safe -
315/75R16 879 0.70% 60.42 mph Safe -
285/85R15 866 -0.84% 59.50 mph Safe -
345/70R15 864 -1.01% 59.40 mph Within tolerance -
295/85R15 883 1.11% 60.67 mph Within tolerance -
335/75R15 884 1.23% 60.74 mph Within tolerance -
325/70R16 861 -1.31% 59.22 mph Within tolerance -
315/80R15 885 1.40% 60.84 mph Within tolerance -
345/70R16 889 1.90% 61.14 mph Within tolerance -
345/65R16 855 -2.05% 58.77 mph Within tolerance -
315/75R15 854 -2.21% 58.67 mph Within tolerance -
295/80R15 853 -2.27% 58.64 mph Within tolerance -
325/75R16 894 2.42% 61.45 mph Within tolerance -
335/70R15 850 -2.61% 58.43 mph Within tolerance -
315/70R16 847 -2.91% 58.25 mph Within tolerance -
345/75R15 899 2.94% 61.77 mph Within tolerance -

Which upsize path fits your priorities?

Every option on this page is inside the ETRTO ±3% overall-diameter tolerance, so any of them is mechanically safe on the factory rim geometry. The difference is what each trades. Use this to pick the category, then read the verdict table above for the exact sizes.

CategoryRide comfortHandlingFuel economyRoad noiseTire cost
Plus-1Slightly firmerSharper≈ neutral≈ neutralModest premium
Plus-2FirmerSharpestSlightly worseSlightly higherHigher premium
Wider (same rim)≈ neutralMore gripSlightly worseSlightly higherModest premium
Winter narrowerSofterSofter dry≈ neutralLower≈ neutral
Narrower (same rim)SofterLess gripBetterLowerOften cheaper
OEM-equivalent≈ OEM≈ OEM≈ OEM≈ OEM≈ OEM

"≈" means no meaningful change versus the factory size. Comfort and noise assume the same tire model and load rating; switching brand or category (touring → performance) usually moves these more than the size change does.

Winter setup for the Hummer H2

For winter, the European engineering rule is to step down one width while raising aspect ratio to hold the same overall diameter; the "Winter / narrower contact" rows in the table above. A narrower footprint concentrates the vehicle's weight over less rubber, raising contact pressure so the tread bites through snow and slush instead of floating on it. Keep the overall diameter within ±3% of 315/70R17 so ABS, TPMS, and (on AWD trims) the center coupling stay inside their factory calibration. Fit four matching winter tires, never two.

Related pages

FAQ

Can I put bigger tires on my Hummer H2?
Yes; within limits. Any size in the tables above is inside the ETRTO ±3% overall-diameter tolerance, which keeps speedometer, TPMS, and ABS calibration intact. The Plus-1 category is the standard bigger-wheel upgrade; Plus-2 is the aesthetic/performance maximum. Sizes beyond ±3% are excluded because they push those systems out of factory range and can rub at full steering lock.
What is the OEM tire size for the Hummer H2?
The Hummer H2 we cover shipped with 315/70R17 as its factory size. Always confirm against your door-jamb placard, as trims and options can change it.
Will bigger tires hurt my Hummer H2's fuel economy or ride?
Plus-1 is close to neutral on both. Plus-2 and wider sizes add rotating mass and footprint, which costs a little fuel economy and ride comfort for sharper steering and grip. The decision matrix above shows the trade-off per category. Staying within ±3% overall diameter means the transmission and speedometer are unaffected.
Do I need new wheels to change tire size on my Hummer H2?
Not for same-rim changes (wider, narrower, winter-narrower keep your factory rim diameter). Plus-1 and Plus-2 raise rim diameter and require wheels in the new diameter with a compatible bolt pattern and offset; check the wheel bolt-pattern page linked below before buying.

Sources & methodology

Last verified 2026-05-17 against the standards below.

  1. ETRTO 2024 Standards Manual §2.3 (section width, aspect ratio, overall diameter formula). European Tyre and Rim Technical Organisation, Brussels.
  2. SAE J1349 (speedometer accuracy reference envelope).
  3. NHTSA FMVSS 138 Tire Pressure Monitoring Systems; rev/mile calibration requirements.
  4. Tire Industry Association Technical Bulletin TB-2019-04 (plus-sizing guidance).
  5. Nokian Tyres "Why winter tyres should be narrower" technical bulletin, 2019.