The front wipers on most GMC Sierra pickups are 22 inches on the driver’s side and 20 inches on the passenger’s side, with a rear blade of 14 inches if your model has a rear window wiper.
Because Sierra models span different generations, cab configurations, and options, exact sizes can vary. This guide outlines the typical sizes for modern Sierras and how to verify the correct lengths for your year and configuration.
Front Wiper Sizes: What to Expect on Most Sierra Trucks
These lengths cover the front windshield wipers you’ll most often need to replace on recently built Sierras.
- Driver-side blade: 22 inches
- Passenger-side blade: 20 inches
Note that variations can occur with older generations or special trims, so always confirm for your exact vehicle.
Variations by Year and Cab Configuration
Some older generations or cab types may use different lengths; verify for your specific truck.
Rear Wiper: When It Applies and Typical Size
Only some Sierra models equipped with a rear window wiper will use a rear blade; many have none. When present, the common size is:
- Rear blade: 14 inches
If your Sierra does not have a rear wiper, you do not need to replace a rear blade.
How to Verify Your Exact Wiper Size
To ensure you buy the right blades for your specific truck, perform these checks.
- Consult your owner's manual or the vehicle’s service guide for winter maintenance and wiper blade sizes for your year and trim.
- Inspect the blades currently installed and measure their length from end to tip, or use a measuring tape to measure the blade length.
- Check the glove box or driver’s door jamb sticker that often lists recommended blade lengths by position.
- Enter your vehicle year, make, model, and trim on an OEM parts site or trusted retailer to confirm the exact wiper sizes for your configuration.
Verifying directly from official specifications or the parts retailer helps avoid ordering the wrong length, especially for older generations or cab variants.
Buying Tips: Front, Rear, and Blades to Consider
Choosing between traditional frame blades and newer beam-style blades can affect performance in rain and snow. Also consider blade quality, winter-rated variants for cold climates, and the warranty offered by brands.
- Front blades: 22" (driver) and 20" (passenger) for most modern Sierras
- Rear blade: 14" if equipped
- Brand options: OEM/GM ACDelco, Bosch ICON, Valeo, Rain-X, Anco
Always verify with your specific year/model. If you replace both sides at once, ensure the blade types and connector style match your wiper arms.
Summary
For most GMC Sierra pickups from about 2014 onward, expect a 22-inch driver-side and 20-inch passenger-side front wiper blades, with a 14-inch rear blade if your model has a rear window wiper. To be sure, check your owner’s manual, your current blades, or an OEM parts lookup for your year and cab configuration. Replacing blades twice a year in winter climates and at least once a year in milder climates helps maintain visibility and safety.