Description

StopTech Drilled Sport Rotors are 1-piece direct replacement brake discs for factory brake systems and stock calipers that look great behind your wheels – and offer significantly improved braking performance. The unique cross-drilling aids with heat and brake dust dispersal; prevents glazing of the pads; adds bite and improves wet and dry braking performance. Built to last; the black e-coating provides protection from corrosion and the high carbon metallurgy (in most applications) offers quieter operation; better crack resistance and increased performance.

Product Overview

For drivers who need something even tougher than a standard StopTech Sport rotor, but are not ready for a big brake kit, StopTech offers cryogenically treated Cryo rotors. Cryogenic treatment is a one-time stress relief process that involves both cold and heat cycling of the brake rotor. Using a proprietary computer-controlled process over a 24-hour period, the cryo machine gradually cools the rotors down to -300 º F, then gradually brings them up to over +300º F, and finally back to room temperature. This conditioning of the rotor improves its service life, especially in fleet and emergency vehicle applications. Any new StopTech or Centric Premium 1-piece replacement rotor can by cryogenically treated prior to shipment. Cryo treatment typically adds 5-7 business days for processing.

Features and Benefits

• Premium e-coated rotor with advanced metallurgy that greatly reduces pad squeal. Especially effective with higher friction; European style brake pad compounds. Drilled for increased bite; improved looks and better performance
• Drilled/Slotted Helps Evacuate Gasses/Dust/Heat
• Directional Curve Vane Designs On Selected Apps
• Power Alloy Is Descendant Of Patented AeroRotor
• Black E-Coated Non-Friction - Corrosion Protection
• Increased Initial bite and Wet Weather Response
• Superior Resistance To Cracks From Thermal Stress
• Double Disk Ground For Consistent Friction Surface
• Direct OE Replacement

Product Details

ABS Tone Ring Included:	No
Attribute ID (Type):	California Proposition 65
Attribute ID Type:	California Proposition 65
Bearings Included:	No
California Proposition 65 Site (basic):	https://www.p65warnings.ca.gov/
California Proposition 65 Site [basic]:	https://www.p65warnings.ca.gov/
California Proposition 65 Text (basic):	WARNING: Cancer and Reproductive Harm
California Proposition 65 Text [basic]:	WARNING: Cancer and Reproductive Harm
California Proposition 65:	WARNING: Cancer and Reproductive Harm
Center Hole Diameter:	75.000
Description:	StopTech Sport Cross Drilled Brake Rotor; Rear Right
Disc Mounting (cntrc):	Floating / DIH
Disc Mounting [cntrc]:	Floating / DIH
Discard Thickness:	18.400
Hat Finish:	Coated
Misc Holes (cntrc):	2
Misc Holes [cntrc]:	2
Mounting Bolt Hole Circle Diameter:	4.724
Nominal Drum Diameter:	7.283
Nominal Thickness:	20.000
Outside Diameter:	327.000
Overall Height:	2.429
Part Number:	sto128.34054R
Position:	Rear Right
Rotor Type:	Drilled
Solid Or Vented Type Rotor:	Vented
Stud/Lug Hole Diameter:	0.575
Stud/Lug Hole Quantity:	5
Surface Type:	X Drilled
Title:	StopTech Sport Cross Drilled Brake Rotor; Rear Right
Vane Style (cntrc):	Straight
Vane Style [cntrc]:	Straight
WARNING CA Proposition 65 Message:	WARNING: Cancer and Reproductive Harm
WARNING CA Proposition 65:	Yes
Weight (cntrc) kgs:	7.760
Weight (cntrc) lbs:	17.070
Weight [cntrc] kgs:	7.760
Weight [cntrc] lbs:	17.070

Kit Options

This item is available as a full kit.
Select a kit option in the following table if you are looking for this item in a bundle form with all associated components.

Kit option/s:

Thumb	SKU	Kit Title
	sto979.34004	Sport Axle Pack Drilled Rotor, 4 Wheel (1x sto128.34054R, 1x sto128.34054L, 1x sto309.03940, 1x sto309.06830, 1x sto950.34005, 1x sto128.34058L, 1x sto128.34059R, 1x sto950.34505)
	sto979.34017	Sport Axle Pack Drilled Rotor, 4 Wheel (1x sto950.34503, 1x sto950.34003, 1x sto128.34054R, 1x sto128.34054L, 1x sto309.06830, 1x sto128.34062L, 1x sto128.34063R, 1x sto309.06810)
	sto979.34004R	Sport Axle Pack Drilled Rotor, Rear (1x sto128.34054R, 1x sto128.34054L, 1x sto309.06830, 1x sto950.34505)
	sto979.34017R	Sport Axle Pack Drilled Rotor, Rear (1x sto950.34503, 1x sto128.34054R, 1x sto128.34054L, 1x sto309.06830)

Data: v4.2 - Upd: 2026-09-30 16:24:46

Features

Specifications

Product Attributes - UPC

805890559498

Product Attributes - Brand

StopTech

Product Attributes - Quantity

Sold individually.

Product Attributes - Part Type

Brake Rotors

Product Attributes - Rotor Style

Cross-drilled surface

Product Attributes - Product Line

StopTech Drilled Brake Rotors

Product Attributes - Rotor Finish

Black E-Coat

Product Attributes - Rotor Material

Iron

Product Attributes - Rotor Construction

Vented

Product Attributes - Intended for Street Use

Yes

Product Attributes - Nominal Thickness (in.)

0.780 in.

Product Attributes - Manufacturer's Part Number

128.34054R

Product Attributes - For Use with Stock Calipers

Yes

Product Attributes - Rotor Outside Diameter (in.)

12.88 in.

Compatibility