In brief, the 2020 GMC Sierra 1500 uses 22-inch wiper blades on the driver's side and 18-inch blades on the passenger's side for the front windshield. If your truck has a rear wiper, the rear blade is typically 12 inches. Different cab configurations or trims can affect rear-wiper availability, so verify if needed.
Front Wiper Blade Sizes
The following sizes apply to the front wiper blades on most 2020 Sierra 1500 models, covering standard configurations like Crew Cab and Double Cab.
- Driver-side blade: 22 inches
- Passenger-side blade: 18 inches
These measurements align with common OEM specs for the 2020 Sierra 1500 and are compatible with most aftermarket blade options labeled for 22" and 18" fronts.
Rear Wiper Blade (If Equipped)
Not every Sierra 1500 trim includes a rear window wiper. If your vehicle does have one, the blade size is typically smaller and designed to fit the rear window.
- Rear blade: 12 inches
Since some configurations omit a rear wiper entirely, this size only applies to models that include the rear window wiper feature. Always confirm by checking the current blade or owner’s manual.
How to Verify and Replace
If you’re unsure about the exact size, measure the current blades or consult the owner’s manual or a GM parts catalog. Most auto parts stores can confirm compatibility by year, make, model, and cab configuration, and will provide OEM or aftermarket options in the correct lengths.
Summary
For a 2020 GMC Sierra 1500, plan on front wipers sized 22 inches on the driver’s side and 18 inches on the passenger’s side. If your truck has a rear wiper, it typically uses a 12-inch blade; many trucks without a rear wiper do not require this size. Always verify against the owner’s manual or parts dealer to account for any trim-specific variations.