For most 2021 GMC Sierra pickups, the front wiper blades are 22 inches on both the driver and passenger sides, and the rear blade (if your model has one) is typically about 11 inches. Blade sizes can vary slightly by cab configuration and trim, so always verify with the owner’s manual or the current blade packaging for your exact build.
The 2021 Sierra lineup spans the 1500 and heavier HD variants, and blade lengths may differ by cab style (Regular, Double/Extended, Crew) and by whether a rear wiper is fitted. The following sections outline typical sizes and how to confirm them for your specific truck.
Front wiper blade sizes
The sizes below reflect common front blade lengths for the 2021 Sierra. Exact lengths can vary by configuration, so use these as a starting point and verify against your vehicle.
- Driver-side front blade: 22 inches
- Passenger-side front blade: 22 inches
Concluding: 22 inches is the standard front-length for most 2021 Sierra front wipers, but always confirm on your exact build, especially if you have a non-standard cab/bed configuration or a regional spec.
Rear wiper blade size (if equipped)
Not every 2021 Sierra includes a rear wiper. If yours does, the rear blade is a compact size and typically around 11 inches.
- Rear blade: 11 inches
Concluding: The rear blade size is usually about 11 inches on GM trucks with a rear wiper, but verify for your specific model to avoid a poor fit.
How to verify for your exact truck
Follow these steps to confirm the correct blade sizes for your vehicle before buying replacements.
- Check the owner's manual or the GM Parts catalog with your VIN for exact blade lengths.
- Inspect the current blades for length markings and connector type.
- Use the retailer’s product descriptions to match length and connector style (GM uses specific connectors for some models).
- If in doubt, bring the current blades to an auto parts store to compare with packaging and confirm a proper fit.
Verifying via these steps ensures you get the correct blades for your 2021 GMC Sierra, regardless of cab or trim configuration.
Summary
In short, plan for 22-inch front wiper blades on both sides for most 2021 GMC Sierra models, with an 11-inch rear blade if your truck has a rear wiper. Always confirm against your manual, VIN-based parts catalog, or current blades, since variations can occur among cab configurations and HD variants.