Overview
The Baer Brakes 55057-020 is a rear Claw performance brake rotor set for listed Chevrolet and GMC 2500 and 3500 trucks, vans and SUVs, plus the 2003–2009 Hummer H2. Each rotor is one-piece, full cast and vented, with an 8-stud pattern and a slotted and cross-drilled friction surface.
Cross-drilled and slotted faces move gases and dust out of the pad-to-rotor interface. The slot pattern supports consistent pedal feel and reduced fade. The cast iron rotors carry a zinc-plated finish for a bright look behind open center wheels. The overall height is 86 and the outside diameter is 330.2, so compare them with your existing rotor before fitting.
Key features
- Gases and dust exit through slots and cross-drilled holes on the friction face.
- Vane structure and premium materials support cooling and durability.
- Premium, mill balanced direct replacement rotor.
- Chamfered cross-drilled holes reduce the risk of stress cracking.
- Zinc-plated surface for appearance in open center wheels.
- Directional brake surface.
Heavy truck rotor considerations
Trucks and vans in the 2500 and 3500 class work harder than light-duty vehicles, with heavier loads, longer downhill braking and frequent towing. Rotor mass and friction area affect how well the system absorbs and sheds heat, so a rotor that matches the original size and hub design is the right starting point. Measure the existing rotor before ordering, especially outside diameter and overall height.
Rear rotors on these trucks often wear alongside pads and bearings. Inspect hub bearings, seals and caliper slides during the job, since a worn bearing can cause runout that shows up as pedal pulsation. Clean the hub face and rotor hat so the new rotor sits flat before the lug nuts go on.
- Match the stud count and bolt circle to the truck
- Check for runout with a dial indicator
- Replace pads on the same axle
- Use a torque wrench on the lug nuts
- Re-check lug torque after the first few stops
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 55057-020 |
| UPC | 844165002215 |
| Sold as | Set (pair of rotors) |
| Axle | Rear |
| Construction | One piece, full cast |
| Rotor type | Vented |
| Surface type | Slotted and drilled |
| Brake surface | Directional |
| Material | Cast iron |
| Disc finish | Zinc plated |
| Grade | Premium |
| Outside diameter | 330.2 |
| Overall height | 86 |
| Mounting bolt hole circle diameter | 165 |
| Stud/lug hole quantity | 8 |
| Discard thickness | 27.5 |
| Emission code | 6 |
| ABS tone ring included | No |
| Country of origin | CN |
Vehicle fitment
The manufacturer fitment list covers rear positions on: 2003–2023 Chevrolet Express 3500; 1999–2004 Chevrolet Silverado 2500; 2000–2007 Chevrolet Suburban 2500; 1999–2004 GMC Sierra 2500; 2000–2007 GMC Yukon XL 2500; and 2003–2009 Hummer H2.
Some older Chevrolet and GMC truck years and Savana applications are not covered. Several qualifiers apply to this rotor, including 8 lugs and a 4.63 inch center register. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Several applications carry qualifiers such as 8 lugs, without four wheel steering, and a 4.63 inch center register, so match those against your truck before fitting. The rotor is a direct replacement. Brake service is a safety task, so get it done by a technician experienced with heavy trucks.
What’s included
A pair of rear Claw rotors, sold as a set.
Not included: an ABS tone ring.
