2024+ Chevrolet Blazer EV 21" OEM Tire Replacement Guide

The 2024+ Chevrolet Blazer EV RS ships on a 21×9.5” alloy wheel with a factory 275/45R21 Bridgestone Alenza A/S 02. The LT trim uses a smaller 19-inch wheel covered in our Blazer EV 19” OEM tire replacement guide. The high-performance SS uses a 22-inch wheel covered in our Blazer EV SS 22” OEM tire replacement guide.

OEM Wheel and Tire Specs

The RS trim ships on a 21×9.5” wheel at +40mm offset, 6×132 bolt pattern, and 74.5mm centerbore.

The Bridgestone Alenza A/S 02 carries a TPC Spec label. TPC Spec (Tire Performance Criteria Specification) means a tire meets the specific handling, safety, and ride comfort standards that General Motors requires for their vehicles. You do not need to buy a TPC Spec tire when replacing your OEM tires. Any tire meeting the size, load index, and speed rating requirements is a valid replacement. The ENLITEN designation is Bridgestone’s EV-optimized technology, combining a silica-rich compound and optimized construction to reduce rolling resistance and extend range.

The RS OEM tire carries Bridgestone’s B-Seal designation. B-Seal tires contain a layer of viscous sealant bonded to the inner liner that automatically seals tread punctures up to approximately 4mm in diameter while the tire remains in motion. This is especially relevant given the Blazer EV carries a Tire Mobility Kit rather than a spare tire. Replacing the OEM B-Seal tire with a standard tire eliminates that self-sealing capability. If you want to maintain self-sealing capabilities, look for Bridgestone B-Seal, Continental ContiSeal, Pirelli Seal Inside, Michelin SelfSeal, or Goodyear SealTech tires.

Before You Buy

Tire size. The OEM size is 275/45R21. The 285/45R21 is a wider alternative that fills the 9.5-inch rim more squarely and adds a slightly larger contact patch, staying within the ±3% diameter threshold at roughly +1.2% overall diameter at the slight expense of range. For all compatible sizes, see the 275/45R21 tire table.

Load index. The OEM tire carries a 107 load index at standard load (SL). Match or exceed 107 on all four corners when replacing.

TPMS. The Blazer EV uses direct TPMS with 433 MHz sensors. Sensors stay in the wheel during a standard tire swap and do not need to be replaced. After mounting, the Auto Learn system will recognize the new sensor positions automatically after approximately 10 minutes at above 15 mph. If the system does not pair automatically, a manual relearn can be initiated through the infotainment screen settings using a standard GM TPMS activation tool.

Spare / Tire Mobility Kit. The Blazer EV does not include an OEM spare tire. Chevrolet provides a Tire Mobility Kit consisting of an air compressor and tire sealant canister. The kit handles small tread punctures only and will not seal a sidewall blowout. Consider roadside assistance coverage for long-distance driving.

AWD tire replacement. GM specifies tread depth across all four wheels must stay within 2/32” to 3/32” of each other. If replacing fewer than four tires, place the tires with the most remaining tread depth on the rear axle. The RS is available in both FWD and AWD configurations; AWD owners should aim to replace all four simultaneously.

Grand Touring All-Season

The Bridgestone Alenza A/S 02 is a Crossover/SUV Touring All-Season. It is quiet, comfortable, and rated for rain and light snow without requiring seasonal swaps. It does not, however, carry a 3-Peak Mountain Snowflake (3PMSF) rating, whereas most Grand Touring All-Season tires do. Grand Touring All-Seasons are the right category choice for most Blazer EV LT owners who want a straightforward year-round capable upgrade.

The Michelin CrossClimate2 and Continental SecureContact AW are both worth considering if you see significant winter weather. They carry the 3-Peak Mountain Snowflake (3PMSF) rating that the Alenza A/S does not. Vredestein’s tires consistently test well against higher-priced competition at noticeably lower prices and are worth a look if budget is a concern.

Ultra High Performance All-Season

If you want sharper handling without giving up year-round usability, ultra high performance all-season tires improve cornering response and wet grip meaningfully over Touring All-Seasons at the expense of winter performance. The Blazer EV RS’s instant torque responds well to a firmer, more performance-oriented compound.

The Blazer EV’s larger tire size means Summer Performance tires in 21” sizes are very limited. See 275/45R21 for a wider variety of alternative tires.

Winter Tires

Cold weather cuts EV range and limits the grip of all-season tires simultaneously. A dedicated winter set handles both problems. If you regularly drive in snow or ice, a seasonal swap is the right call. For a narrower winter fitment, 265/45R21 and 265/50R21 are practical alternatives — the slightly narrower contact patch improves bite on packed snow and stays within 2% of OEM diameter. Sizing is limited in the OEM 275/45R21, but Tire Rack offers pre-packaged Blazer EV winter wheel-and-tire sets in more practical 18” and 20” diameters.

Performance Winter and Snow

Performance winter tires carry a 3PMSF rating and are fully winter-capable, but prioritize dry and wet handling alongside snow traction. The right choice for owners who cover highway miles through winter and want confident grip without sacrificing all handling dynamics.

Studless Ice and Snow

Studless ice and snow tires maximize winter traction on ice, packed snow, and in severe cold. Dry-road handling is softer than a performance winter, but in genuinely harsh conditions these tires make a measurable safety difference.

Mounting and Installation

If you do not already have a relationship with a local tire shop, Tire Rack ships tires to their highly-rated network of local installers who will mount, balance, and install. Order online and drive to your nearest installer.

• TPMS sensors stay in the wheel. Do not pay for new sensors on a routine replacement. A valve stem seal inspection is normal and worth doing.
• TPMS relearn. After mounting, drive above 15 mph for approximately 10 minutes. The Auto Learn system will automatically register the sensors. If it does not complete automatically, use the infotainment screen settings to initiate a manual match with a GM TPMS activation tool.
• Lug torque: 140 lb-ft (190 Nm). M14×1.5 lug thread. Confirm your installer uses a calibrated torque wrench.
• Tire Mobility Kit. There is no spare tire. Keep the OEM air compressor and sealant canister in the vehicle.
• AWD tread depth tolerance. Keep all four tires within 2/32”–3/32” of each other. Place tires with the most remaining tread on the rear axle.
• New tires go on the rear. When replacing in pairs on FWD variants, always install the newer tires on the rear axle.