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Centric 121.66021 Disc Brake Rotor - Front
Reliable Disc Brake Rotor for Chevrolet and GMC Vans
The Centric 121.66021 disc brake rotor is engineered for dependable braking performance on Chevrolet G30, GMC P30, and P3500 models. Designed to meet OEM specifications, this rotor ensures consistent stopping power and durability for your vehicle's braking system.
- Part Number: 121.66021
- Compatible with Chevrolet G30, GMC P30, and P3500
- Vented disc brake rotor with smooth surface finish
- Outside diameter: 12.5 inches (317.5 mm)
- Nominal thickness: 1.535 inches (38.99 mm)
- Discard thickness: 1.465 inches (37.21 mm)
- Stud thread diameter: 0.563 inches
- 8 lug holes with 6.5-inch bolt circle diameter
- Overall height: 7.685 inches (195.2 mm)
- Straight vane style for effective heat dissipation
About the C-TEK Standard Disc Brake Rotors Line
The C-TEK Standard Disc Brake Rotors line by Centric offers rotors designed to meet or exceed OEM standards for fit, form, and function. This product line focuses on providing reliable braking components with precise engineering, including vented rotors that help maintain optimal operating temperatures. The 121.66021 rotor is part of this line, delivering consistent performance for heavy-duty Chevrolet and GMC vans.
Technical Details and Specifications
This vented disc brake rotor features a smooth surface type and straight vane design to promote efficient heat dissipation during braking. The rotor measures 12.5 inches in outside diameter and has a nominal thickness of 1.535 inches, with a discard thickness of 1.465 inches, indicating when replacement is necessary. It includes 8 stud/lug holes with a 6.5-inch bolt circle diameter and a stud thread diameter of 0.563 inches. The overall height of the rotor is 7.685 inches, ensuring proper fitment on compatible Chevrolet G30, GMC P30, and P3500 models. Note that this rotor does not include an ABS tone ring or bearings.
Common Applications and Problem Solving
- Replacement for worn or warped rotors causing brake pulsation
- Addressing reduced braking efficiency due to rotor thickness below discard limits
- Eliminating noise and vibration from uneven rotor surfaces
- Upgrading to vented rotors for improved heat management in heavy-duty vans
- Ensuring proper fitment on Chevrolet G30, GMC P30, and P3500 brake systems
Installation Notes and Tips
Before installation, verify rotor dimensions and compatibility with your vehicle's make and model. Ensure the hub and rotor mounting surfaces are clean and free of debris. Use proper torque specifications for the 8 lug nuts to avoid rotor warping. Since this rotor does not include bearings or seals, inspect and replace those components separately if needed. It is recommended to replace brake pads simultaneously to maintain optimal braking performance.
Quality Assurance and Warranty
Centric's C-TEK Standard Disc Brake Rotors are manufactured to meet strict quality standards, ensuring reliable performance and durability. While specific warranty details for part number 121.66021 are not provided here, Centric typically offers limited warranties covering defects in materials and workmanship. Consult product documentation or Centric directly for warranty terms applicable to this rotor.
| Brand | Centric |
|---|---|
| Part Number | 121.66021 |
| Position | C-TEK Standard Disc Brake Rotors, Front |
| ABS Tone Ring Included | No |
| Bearings Included | No |
| Bolt Thread Pitch | 18.000 |
| Center Hole Diameter | 4.555 |
| Center Hole Diameter | 115.700 |
| Disc Mounting [cntrc] | Hub & Rotor |
| Discard Thickness | 1.465 |
| Discard Thickness | 37.210 |
| Inner Bearing # [cntrc] | 410.91035 |
| Inner Seal # [cntrc] | 417.66008 |
| Misc Holes [cntrc] | 0 |
| Mounting Bolt Hole Circle Diameter | 6.500 |
| Mounting Bolt Hole Circle Diameter | 165.100 |
| Nominal Thickness | 1.535 |
| Nominal Thickness | 38.990 |
| Outer Bearing # [cntrc] | 415.66000 |
| Outer Race # [cntrc] | 416.66000 |
| Outside Diameter | 12.500 |
| Outside Diameter | 317.500 |
| Overall Height | 7.685 |
| Overall Height | 195.200 |
| Solid Or Vented Type Rotor | Vented |
| Stud Thread Diameter | 0.563 |
| Stud/Lug Hole Quantity | 8 |
| Surface Type | Smooth |
| Vane Style [cntrc] | Straight |
| Weight [cntrc] kgs | 25.450 |
| Weight [cntrc] lbs | 56.000 |
This part fits 12 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1999 | Chevrolet | P30 | Front | DRW; IFS; C-TEK Standard Disc Brake Rotors |
| 1999 | GMC | P3500 | Front | DRW; IFS; C-TEK Standard Disc Brake Rotors |
| 1998 | Chevrolet | P30 | Front | DRW; IFS; C-TEK Standard Disc Brake Rotors |
| 1998 | GMC | P3500 | Front | DRW; IFS; C-TEK Standard Disc Brake Rotors |
| 1997 | Chevrolet | P30 | Front | DRW; IFS; C-TEK Standard Disc Brake Rotors |
| 1997 | GMC | P3500 | Front | DRW; IFS; C-TEK Standard Disc Brake Rotors |
| 1995 | Chevrolet | G30 | Front | Fitment: Heavy Duty Dual Rear Wheels.; C-TEK Standard Disc Brake Rotors |
| 1995 | GMC | G3500 | Front | Fitment: Heavy Duty Dual Rear Wheels.; C-TEK Standard Disc Brake Rotors |
| 1994 | Chevrolet | G30 | Front | Fitment: Heavy Duty Dual Rear Wheels.; C-TEK Standard Disc Brake Rotors |
| 1994 | GMC | G3500 | Front | Fitment: Heavy Duty Dual Rear Wheels.; C-TEK Standard Disc Brake Rotors |
| 1993 | Chevrolet | G30 | Front | Fitment: Heavy Duty Dual Rear Wheels.; C-TEK Standard Disc Brake Rotors |
| 1993 | GMC | G3500 | Front | Fitment: Heavy Duty Dual Rear Wheels.; C-TEK Standard Disc Brake Rotors |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.