A-Premium Idler Pulley for GM Vehicles — 90mm Steel, 17mm Bore, Sealed Bearing

The A-Premium belt idler pulley is a precision-engineered steel replacement pulley that restores proper belt routing and tension on many Chevrolet, GMC, Cadillac and Buick V8/V6 applications.

This single-piece idler pulley is built to OE-style dimensions so it fits directly where the factory unit sits and helps maintain smooth accessory drive operation. It’s designed to match the outside diameter, bore and width specifications used on dozens of trucks and SUVs, offering a durable steel construction and a sealed bearing intended for quiet rotation under load.

Which vehicles will this idler pulley fit?

This pulley is made for a wide range of GM and related vehicles — from light trucks and full-size SUVs to some commercial chassis. Fitment covers numerous Silverado, Sierra, Tahoe, Suburban, Avalanche, Yukon and Denali model families as well as compatible Isuzu, Hummer and Workhorse platforms.

• Chevrolet: Silverado, Avalanche, Tahoe, Suburban, Trailblazer, Express, SSR
• GMC: Sierra, Yukon, Envoy, Savana, Topkick chassis
• Cadillac & Buick: Escalade, Rainier; select Saab/Isuzu/Hummer models
• Workhorse and commercial chassis fitment listed for medium-duty applications

How do the pulley dimensions and materials affect performance?

The pulley’s outside diameter (90 mm), 17 mm bearing bore and 31 mm width match the original equipment envelope to preserve belt alignment. Steel construction offers strength against edge wear while the sealed bearing helps prevent contamination and reduces noise.

• Outside Diameter: 90 mm for correct belt wrap
• Bore: 17 mm to fit factory mounting studs or shafts
• Width: 31 mm to support proper belt seating
• Material: steel body with sealed bearing for durability

Will installing this pulley restore belt tension and reduce noise?

Replacing a worn idler pulley with the A-Premium unit restores the intended pulley geometry so the drive belt tracks correctly and tension is maintained. A well-mounted, smooth-rotating pulley reduces slippage and squeal caused by worn bearings or misaligned surfaces.

• OE-style bearing for smooth, quiet rotation
• Steel face resists wear from belt contact
• Matches factory reference numbers for correct replacement
• Helps reduce common belt noise and premature belt wear

What warranty and part references does A-Premium provide?

A-Premium backs this idler pulley with a one-year unlimited-mileage guarantee, reflecting confidence in fit and construction. Reference numbers included with the part help confirm compatibility before purchase.

• One-year unlimited-mileage limited warranty
• Reference numbers: 12555609, 12580771, 12669569, 36299
• Sold as a single pulley quantity for direct replacement
• Packaged for easy identification and installation

Who is this for: The A-Premium belt idler pulley is aimed at DIY mechanics, independent repair shops and fleet service technicians looking for a cost-effective, OE-dimension replacement for GM and compatible vehicles. Choose this pulley if you need a reliable steel-bodied idler that matches factory sizing, helps silence belt drive noise and carries a straightforward one-year warranty.