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All Buick Regal Brake Rotors (1,624)StopTech All StopTech Parts
StopTech Sportstop Drilled Brake Rotors Zoom
pictures may vary by application

StopTech

StopTech Sportstop Drilled Brake Rotors

StopTech recognizes that great brakes need to look as good as they perform. Performance wheels and tires are best complemented with StopTech SportStop Drilled or Drilled and Slotted rotors. SportStop Drilled and Slotted Rotors prevent glazing of the pads, add bite and improve wet and dry braking performance. Every SportStop brake rotor is produced from a high quality Centric parts blank casting and finished in a durable e-coating for corrosion resistance.

Engineered to look good behind the wheel and perform at the same time

SportStop Drilled rotors look great behind custom wheels, improve the initial bite of the brake pads, and help wipe away the debris that forms between the pad and the disc. A set of SportStop Drilled rear replacement rotors is a great way to match the aesthetics of a StopTech Big Brake Kit with the Drilled rotor option.
E-Coated Finish
Every SportStop rotor is finished with black e-coating on both sides of the hat, inside the the cooling vanes, and on the outside edge. E-coating is a superior electro-statically applied finish designed to withstand 400 hours of salt water exposure without rusting. This is especially important on both mounting faces of the hat where it touches the hub flange and back face of the wheel. Any accumulation of rust in these area can lead to installed lateral run out issues.

Cooling Vane Design
Nearly all SportStop Drilled and Drilled and Slotted rotors have unique drilled hole patterns for the left and right sides of the vehicle. For these directional patterns, straight vane or pillar vane rotors are used to ensure that a drilled hole never touches a cooling vane.

Power Alloy Metallurgy
Power Alloy metallurgy is exclusive feature of Power Slot and SportStop rotors. In specific vehicle applications, StopTech works with foundry partners to increase the molybdenum or carbon content of the castings, and to carefully control the cooling rate during production to reach targets for hardness and tensile strength.



All Buick StopTech Sportstop Drilled Brake Rotors
View All Buick Regal Brake Rotors
Buick RegalPrice
(1982)
Vehicle:(1982) Buick Regal
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1982) Buick Regal
Engine:4.1L V6 252CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:4
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1982) Buick Regal
Engine:4.3L V6 260CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:V
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1982) Buick Regal
Engine:5.7L V8 350CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:N
Engine Desig:LF9
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1982) Buick Regal
Sub Model:ESTATE WAGON
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1982) Buick Regal
Sub Model:ESTATE WAGON
Engine:4.1L V6 252CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:4
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1982) Buick Regal
Sub Model:ESTATE WAGON
Engine:5.7L V8 350CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:N
Engine Desig:LF9
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1982) Buick Regal
Sub Model:LIMITED
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1982) Buick Regal
Sub Model:LIMITED
Engine:4.1L V6 252CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:4
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1982) Buick Regal
Sub Model:LIMITED
Engine:4.3L V6 260CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:V
Engine Desig:LT6
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1982) Buick Regal
Sub Model:LIMITED
Engine:5.7L V8 350CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:N
Engine Desig:LF9
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1982) Buick Regal
Sub Model:SPORT
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
ASP:Turbocharged
Engine VIN:3
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
(1983)
Vehicle:(1983) Buick Regal
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1983) Buick Regal
Engine:4.1L V6 252CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:4
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1983) Buick Regal
Engine:4.3L V6 260CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:V
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1983) Buick Regal
Engine:5.7L V8 350CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:N
Engine Desig:LF9
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1983) Buick Regal
Sub Model:ESTATE WAGON
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1983) Buick Regal
Sub Model:ESTATE WAGON
Engine:4.1L V6 252CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:4
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1983) Buick Regal
Sub Model:ESTATE WAGON
Engine:5.7L V8 350CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:N
Engine Desig:LF9
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1983) Buick Regal
Sub Model:LIMITED
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1983) Buick Regal
Sub Model:LIMITED
Engine:4.1L V6 252CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:4
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1983) Buick Regal
Sub Model:LIMITED
Engine:4.3L V6 260CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:V
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1983) Buick Regal
Sub Model:LIMITED
Engine:5.7L V8 350CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:N
Engine Desig:LF9
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1983) Buick Regal
Sub Model:T-TYPE
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
ASP:Turbocharged
Engine VIN:8
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
(1984)
Vehicle:(1984) Buick Regal
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1984) Buick Regal
Engine:4.1L V6 252CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:4
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1984) Buick Regal
Engine:4.3L V6 260CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:V
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1984) Buick Regal
Sub Model:GRAND NATIONAL
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
ASP:Turbocharged
Engine VIN:9
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1984) Buick Regal
Sub Model:LIMITED
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1984) Buick Regal
Sub Model:LIMITED
Engine:4.1L V6 252CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:4
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1984) Buick Regal
Sub Model:LIMITED
Engine:4.3L V6 260CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:V
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1984) Buick Regal
Sub Model:T-TYPE
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
ASP:Turbocharged
Engine VIN:9
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
(1985)
Vehicle:(1985) Buick Regal
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1985) Buick Regal
Engine:5.7L V8 350CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:N
Engine Desig:LF9
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1985) Buick Regal
Sub Model:GRAND NATIONAL
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
ASP:Turbocharged
Engine VIN:9
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1985) Buick Regal
Sub Model:LIMITED
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1985) Buick Regal
Sub Model:LIMITED
Engine:4.3L V6 260CID DIESEL
Fuel Delivery:FI
Fuel Config:FI
Engine VIN:V
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1985) Buick Regal
Sub Model:T-TYPE
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
ASP:Turbocharged
Engine VIN:9
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
(1986)
Vehicle:(1986) Buick Regal
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1986) Buick Regal
Engine:5.0L V8 307CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:Y
Engine Desig:LV2
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1986) Buick Regal
Sub Model:GRAND NATIONAL
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:SFI
ASP:Turbocharged
Engine VIN:7
Engine Desig:LC2
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1986) Buick Regal
Sub Model:LIMITED
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1986) Buick Regal
Sub Model:LIMITED
Engine:5.0L V8 307CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:Y
Engine Desig:LV2
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1986) Buick Regal
Sub Model:T-TYPE
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:SFI
ASP:Turbocharged
Engine VIN:7
Engine Desig:LC2
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
(1987)
Vehicle:(1987) Buick Regal
Engine:3.8L V6 231CID GAS
Fuel Delivery:CARB
Fuel Config:2BBL
Engine VIN:A
Engine Desig:LD5
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1987) Buick Regal
Engine:5.0L V8 307CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:Y
Engine Desig:LV2
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1987) Buick Regal
Sub Model:GRAND NATIONAL
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:SFI
ASP:Turbocharged
Engine VIN:7
Engine Desig:LC2
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1987) Buick Regal
Sub Model:LIMITED
Engine:3.8L V6 231CID GAS
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
Vehicle:(1987) Buick Regal
Sub Model:LIMITED
Engine:5.0L V8 307CID GAS
Fuel Delivery:CARB
Fuel Config:4BBL
Engine VIN:Y
Engine Desig:LV2
Specifics: Drilled
10.51 in. Dia.
4.19 in. Height
$109.45  Add to Cart
(1995)
Vehicle:(1995) Buick Regal
Sub Model:CUSTOM
Engine:3.1L V6 189CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:M
Engine Desig:L82
Specifics: Drilled
11.22 in. Dia.
1.40 in. Height
$100.21  Add to Cart
Vehicle:(1995) Buick Regal
Sub Model:CUSTOM
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:L
Engine Desig:L27
Specifics: Drilled
11.22 in. Dia.
1.40 in. Height
$100.21  Add to Cart
Vehicle:(1995) Buick Regal
Sub Model:GRAN SPORT
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:L
Engine Desig:L27
Specifics: Drilled
11.22 in. Dia.
1.40 in. Height
$100.21  Add to Cart
Vehicle:(1995) Buick Regal
Sub Model:LIMITED
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:L
Engine Desig:L27
Specifics: Drilled
11.22 in. Dia.
1.40 in. Height
$100.21  Add to Cart
(1996)
Vehicle:(1996) Buick Regal
Sub Model:CUSTOM
Engine:3.1L V6 189CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:M
Engine Desig:L82
Specifics: Drilled
11.22 in. Dia.
1.40 in. Height
$100.21  Add to Cart
Vehicle:(1996) Buick Regal
Sub Model:CUSTOM
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:K
Engine Desig:L36
Specifics: Drilled
11.22 in. Dia.
1.40 in. Height
$100.21  Add to Cart
Vehicle:(1996) Buick Regal
Sub Model:GRAN SPORT
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:K
Engine Desig:L36
Specifics: Drilled
11.22 in. Dia.
1.40 in. Height
$100.21  Add to Cart
Vehicle:(1996) Buick Regal
Sub Model:LIMITED
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:K
Engine Desig:L36
Specifics: Drilled
11.22 in. Dia.
1.40 in. Height
$100.21  Add to Cart
(1997)
Vehicle:(1997) Buick Regal
Sub Model:GS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
ASP:Supercharged
Engine VIN:1
Engine Desig:L67
Specifics: Drilled
$115.12  Add to Cart
Vehicle:(1997) Buick Regal
Sub Model:LS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:K
Engine Desig:L36
Specifics: Drilled
$115.12  Add to Cart
(1998)
Vehicle:(1998) Buick Regal
Sub Model:GS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
ASP:Supercharged
Engine VIN:1
Engine Desig:L67
Specifics: Drilled
$115.12  Add to Cart
Vehicle:(1998) Buick Regal
Sub Model:LS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:K
Engine Desig:L36
Specifics: Drilled
$115.12  Add to Cart
(1999)
Vehicle:(1999) Buick Regal
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Specifics: Drilled
$115.12  Add to Cart
(2000)
Vehicle:(2000) Buick Regal
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Specifics: Drilled
$115.12  Add to Cart
(2001)
Vehicle:(2001) Buick Regal
Sub Model:GS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
ASP:Supercharged
Engine VIN:1
Engine Desig:L67
Specifics: Drilled
$115.12  Add to Cart
Vehicle:(2001) Buick Regal
Sub Model:LS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:K
Engine Desig:L36
Specifics: Drilled
$115.12  Add to Cart
(2002)
Vehicle:(2002) Buick Regal
Sub Model:GS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
ASP:Supercharged
Engine VIN:1
Engine Desig:L67
Specifics: Drilled
$115.12  Add to Cart
Vehicle:(2002) Buick Regal
Sub Model:LS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:K
Engine Desig:L36
Specifics: Drilled
$115.12  Add to Cart
(2003)
Vehicle:(2003) Buick Regal
Sub Model:GS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
ASP:Supercharged
Engine VIN:1
Engine Desig:L67
Specifics: Drilled
$115.12  Add to Cart
Vehicle:(2003) Buick Regal
Sub Model:LS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:K
Engine Desig:L36
Specifics: Drilled
$115.12  Add to Cart
(2004)
Vehicle:(2004) Buick Regal
Sub Model:GS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
ASP:Supercharged
Engine VIN:1
Engine Desig:L67
Specifics: Drilled
$115.12  Add to Cart
Vehicle:(2004) Buick Regal
Sub Model:LS
Engine:3.8L V6 231CID GAS
Fuel Delivery:FI
Fuel Config:MFI
Engine VIN:K
Engine Desig:L36
Specifics: Drilled
$115.12  Add to Cart
(2012)
Vehicle:(2012) Buick Regal
Engine:2.4L L4 145CID FLEX
Fuel Delivery:FI
Specifics: Drilled
Brake caliper:With Brembo Front Caliper
$178.92  Add to Cart
Vehicle:(2012) Buick Regal
Sub Model:GS
Engine:2.0L L4 122CID FLEX
Fuel Delivery:FI
Fuel Config:MFI
ASP:Turbocharged
Engine VIN:V
Engine Desig:LHU
Specifics: Drilled
Brake caliper:With Brembo Front Caliper
$178.92  Add to Cart
Vehicle:(2012) Buick Regal
Sub Model:TURBO
Engine:2.0L L4 122CID FLEX
Fuel Delivery:FI
Fuel Config:MFI
ASP:Turbocharged
Engine VIN:V
Engine Desig:LHU
Specifics: Drilled
Brake caliper:With Brembo Front Caliper
$178.92  Add to Cart
 
This product also fits other vehicles.

All StopTech Sportstop Drilled Brake Rotors
 
 
StopTech Sportstop Drilled Brake Rotor Reviews
  (6 of 10) 1 Review    Write Review
RatingDateModelReview
603/28/2013M5Wrong hub bore, had to bore the rotors about 1.5mm

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