KMC

KMC X10 React Cassette Sprockets | 10-Speed | 11-42 Cassette | 11-13T

Fits: 11-42T cassettes
Set includes: 11T, 13T sprockets, locking ring

KMC Sprocket for Enviolo Narrow 18T E-Bike

Hardened chrome-molybdenum steel
To the enviolo
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e1EPT

Item no.: BSRN5018
Size: 1/2" X 3/32"
Color: Black

3500km+:

It lasts. And it lasts.

The 3500 HP+ drivetrain is the perfect solution for demanding drivers. The combination of our e1 EPT chain and narrow sprockets ensures a guaranteed mileage of 3500 kilometers and more.

blister 2 sets
Color: Silver
pin: 7.3 mm

EPT, maximum corrosion protection

e1EPT / X8EPT / X8 / Z7 / Z6 / Shimano UG51 / HG40 / 50 / 70 / 90

Item no.: C78EPTR73

Dimensions: 1/2" x 3/32"

EPT

Rust protection redefined. KMC's non-toxic and environmentally friendly EcoProTeQ Technology (EPT) provides chains with corrosion protection (first signs of rust appear after 650 hours of salt spray testing), doubling the durability of conventional rust protection and setting new standards.

EcoProTeQ EPT

non-toxic, environmentally friendly

100% coating: each cell element is treated separately

first traces of rust only after 650 hours of salt spray testing (twice as long as conventional rust protection)

smooth surface ensuring excellent driving properties

minimized dirt accumulation, which reduces maintenance costs.

KMC Sprocket for SHIMANO Narrow 22T E-Bike

Hardened chrome-molybdenum steel
For Shimano
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e1EPT

Item no.: BSRS5022
Size: 1/2" X 3/32"
Color: Black

3500km+:

It lasts. And it lasts.

The 3500 HP+ drivetrain is the perfect solution for demanding drivers. The combination of our e1 EPT chain and narrow sprockets ensures a guaranteed mileage of 3500 kilometers and more.

KMC Sprocket for SHIMANO Narrow 27T E-Bike

Hardened chrome-molybdenum steel
For Shimano
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e1EPT

Item no.: BSRS5027
Size: 1/2" X 3/32"
Color: Black

3500km+:

It lasts. And it lasts.

The 3500 HP+ drivetrain is the perfect solution for demanding drivers. The combination of our e1 EPT chain and narrow sprockets ensures a guaranteed mileage of 3500 kilometers and more.

KMC Sprocket for SHIMANO Narrow 21T E-Bike

Hardened chrome-molybdenum steel
For Shimano
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e1EPT

Item no.: BSRS5021
Size: 1/2" X 3/32"
Color: Black

3500km+:

It lasts. And it lasts.

The 3500 HP+ drivetrain is the perfect solution for demanding drivers. The combination of our e1 EPT chain and narrow sprockets ensures a guaranteed mileage of 3500 kilometers and more.

KMC Sprocket for SHIMANO Narrow 17T E-Bike

Hardened chrome-molybdenum steel
For Shimano
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e1EPT

Item no.: BSRS5017
Size: 1/2" X 3/32"
Color: Black

3500km+:

It lasts. And it lasts.

The 3500 HP+ drivetrain is the perfect solution for demanding drivers. The combination of our e1 EPT chain and narrow sprockets ensures a guaranteed mileage of 3500 kilometers and more.

KMC Sprocket for SHIMANO Narrow 19T E-Bike

Hardened chrome-molybdenum steel
For Shimano
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e1EPT

Item no.: BSRS5019
Size: 1/2" X 3/32"
Color: Black

3500km+:

It lasts. And it lasts.

The 3500 HP+ drivetrain is the perfect solution for demanding drivers. The combination of our e1 EPT chain and narrow sprockets ensures a guaranteed mileage of 3500 kilometers and more.

KMC Sprocket for Enviolo Narrow 19T E-Bike

Hardened chrome-molybdenum steel
To the enviolo
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e1EPT

Item no.: BSRN5019
Size: 1/2" X 3/32"
Color: Black

3500km+:

It lasts. And it lasts.

The 3500 HP+ drivetrain is the perfect solution for demanding drivers. The combination of our e1 EPT chain and narrow sprockets ensures a guaranteed mileage of 3500 kilometers and more.

KMC Sprocket for Enviolo Narrow 20T E-Bike

Hardened chrome-molybdenum steel
To the enviolo
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e1EPT

Item no.: BSRN5020
Size: 1/2" X 3/32"
Color: Black

3500km+:

It lasts. And it lasts.

The 3500 HP+ drivetrain is the perfect solution for demanding drivers. The combination of our e1 EPT chain and narrow sprockets ensures a guaranteed mileage of 3500 kilometers and more.

The history of KMC began in 1977, when the brand was founded by Charles Wu in Taiwan. Today, KMC is a large company with offices in Europe and the US, employing approximately 4,500 people. Its chains are recognized and used by the world's best cyclists. Some World Tour teams and professional MTB teams, such as the Sabine Spitz Haibike Pro Team, use its products. Although the company focuses almost exclusively on the production of chains and links, it offers products for a wide variety of bicycles and price ranges.

The KMC Digital Chain Checker is a tool designed for cyclists who value reliability and the health of their equipment. By precisely measuring chain wear, down to one-hundredth of a millimeter, you can accurately determine when to replace your chain, avoiding both premature and delayed intervention. Measuring in inches or millimeters allows the tool to adapt to your needs, and its compatibility with all chain types, including 12-speed, ensures versatility in every situation. This will help you avoid unnecessary drivetrain wear while saving on service and replacement costs.

The durable metal construction with a large, easy-to-read LCD display combines modern design and practicality, satisfying the needs of both amateurs and professionals. The device is ready to use right out of the box – it comes with two CR2032 batteries. Its luxurious craftsmanship and elegant appearance also make it a perfect gift for any bike enthusiast, combining exceptional functionality and style.

KMC Sprocket for Enviolo Narrow 17T E-Bike

Hardened chrome-molybdenum steel
To the enviolo
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e1EPT

Item no.: BSRN5017
Size: 1/2" X 3/32"
Color: Black

3500km+:

It lasts. And it lasts.

The 3500 HP+ drivetrain is the perfect solution for demanding drivers. The combination of our e1 EPT chain and narrow sprockets ensures a guaranteed mileage of 3500 kilometers and more.

KMC Sprocket for Enviolo Narrow 21T E-Bike

Hardened chrome-molybdenum steel
To the enviolo
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e1EPT

Item no.: BSRN5021
Size: 1/2" X 3/32"
Color: Black

3500km+:

It lasts. And it lasts.

The 3500 HP+ drivetrain is the perfect solution for demanding drivers. The combination of our e1 EPT chain and narrow sprockets ensures a guaranteed mileage of 3500 kilometers and more.

KMC Sprocket for Enviolo Wide 18T E-Bike

Hardened chrome-molybdenum steel
To the enviolo
Maximum performance that saves battery life
Only compatible with KMC e101 EPT chain

Item no.: BSRN5818
Size: 1/2" X 1/8" (single speed only)
Color: black

10,000km+:

It lasts. And it lasts.

And it lasts. The 10,000 km+ drivetrain is the solution for frequent drivers. Pairing our e101 EPT/eCargo1 chain with one of our 3 mm wide sprockets and chainrings guarantees a mileage of 10,000 km+.

Size: 1/2"x11/128"
Connecting pins: 5.20 mm
Missing-Link chain connection clip included

Compatible with all 12-speed derailleur systems (except SRAM flat chain systems)

Diamond Like Coating

Perfect gear shifting thanks to the double X-Bridge

Designed specifically for electric bikes with mid-mounted motors

Contains MissingLink

Durability:
Item no.: BD12BB126

Size: 1/2" x 11/128"

Color: Black and blue

Pin length: 5.2 mm

Weight per 110 cells: 273 g

Length: 126 links

X-Series

DLC
DLC Technology: Extremely Durable, Extremely Precise. Unparalleled durability is achieved through precision-hardened and meticulously polished pins and inner plates. Our DLC chains are coated with a diamond-like coating, providing a long-lasting, visually appealing black beauty. Furthermore, this coating creates an exceptionally smooth surface for excellent shifting performance.

minimized dirt accumulation, which reduces maintenance costs.

KMC Sprocket for SHIMANO WIDE 19T E-Bike

Hardened chrome-molybdenum steel
For Shimano
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e101EPT

Item no.: BSRS5819

Size: 1/2" X 1/8" (single speed only)
Color: black

10,000 km+: Lasts. And lasts. And lasts. The 10,000 km+ drivetrain is the solution for frequent drivers. Pairing our e101 EPT/eCargo1 chain with one of our 3mm-wide sprockets and chainrings guarantees 10,000 km+.

KMC Sprocket for SHIMANO WIDE 20T E-Bike

Hardened chrome-molybdenum steel
For Shimano
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e101EPT

Item no.: BSRS5820

Size: 1/2" X 1/8" (single speed only)
Color: black

10,000 km+: Lasts. And lasts. And lasts. The 10,000 km+ drivetrain is the solution for frequent drivers. Pairing our e101 EPT/eCargo1 chain with one of our 3mm-wide sprockets and chainrings guarantees 10,000 km+.

The KMC Easy Chain Wear Gauge is a very useful accessory to have in your cycling toolbox. It allows you to quickly assess the extent of chain stretch and replace the chain if necessary.

KMC Sprocket for SHIMANO WIDE 17T E-Bike

Hardened chrome-molybdenum steel
For Shimano
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e101EPT

Item no.: BSRS5817

Size: 1/2" X 1/8" (single speed only)
Color: black

10,000 km+: Lasts. And lasts. And lasts. The 10,000 km+ drivetrain is the solution for frequent drivers. Pairing our e101 EPT/eCargo1 chain with one of our 3mm-wide sprockets and chainrings guarantees 10,000 km+.

Compatible with all 11-speed derailleur systems

Waxed with KMC GO

Excellent shifting thanks to the double X bridge

Contains MissingLink

Durability:

Item no.: BX11AB118W

Size: 1/2" X 11/128"

Color: Aurora Blue

Pin length: 5.65 mm

Weight per 110 cells: 260 g

Length: 118 links

X-Series

Your bike deserves it.

The KMC X series is designed with the specific characteristics of Shimano, SRAM, and Campagnolo systems in mind, meeting the most demanding requirements. Carefully designed and manufactured, X-Bridge technology, thanks to precisely chamfered plates, enables smooth drivetrains and perfect gear shifting in every riding situation. The X series is trusted by many top athletes in professional cycling.

Improve your ride with KMC GO WAX

Experience the next level of chain performance with our new, advanced dry wax formula. Designed to significantly reduce friction, improve shifting, and ensure optimal efficiency, KMC GO WAX extends drivetrain life by forming a durable microfilm on the chain that repels water and resists dirt adhesion.

For cleaner, faster and longer-lasting performance.

DURABILITY: Once applied, the wax dries to form a protective barrier that is more durable than oil-based products.

CLEANER RUNNING: Our waxed chains attract less dirt, minimizing common causes of wear and ensuring smoother operation.

SIMPLE MAINTENANCE: With minimal dirt buildup, your drivetrain requires less maintenance. Refreshing the wax is simple—just use a dry brush or cloth. No degreasing is required, just a simple touch-up with KMC GO WAX.

ENVIRONMENTALLY FRIENDLY: KMC GO WAX is biodegradable and contains no PFAS or harsh solvents, making it a responsible choice for both your bike and the environment.

Good for your ride, great for the planet

We're pioneering change with our premium chain line and are paving the way for a future where our entire chain range will be free of mineral oil-based lubricants. By producing around 5 million chains per year in the X-series alone, we'll soon save around 20,000 kilograms of mineral oil-based lubricants per year.

This change is just the beginning. Consider the enormous amounts of oil traditionally used to maintain chains and its impact on our environment. Our wax-based solution not only improves drivetrain efficiency but also significantly reduces the environmental footprint of our products by preventing harmful chemicals from entering our ecosystems.

KMC Sprocket for Enviolo Wide 17T E-Bike

Hardened chrome-molybdenum steel
To the enviolo
Maximum performance that saves battery life
Only compatible with KMC e101 EPT chain

Item no.: BSRN5817
Size: 1/2" X 1/8" (single speed only)
Color: black

10,000km+:

It lasts. And it lasts.

And it lasts. The 10,000 km+ drivetrain is the solution for frequent drivers. Pairing our e101 EPT/eCargo1 chain with one of our 3 mm wide sprockets and chainrings guarantees a mileage of 10,000 km+.

KMC Sprocket for Enviolo Wide 20T E-Bike

Hardened chrome-molybdenum steel
To the enviolo
Maximum performance that saves battery life
Only compatible with KMC e101 EPT chain

Item no.: BSRN5820
Size: 1/2" X 1/8" (single speed only)
Color: black

10,000km+:

It lasts. And it lasts.

And it lasts. The 10,000 km+ drivetrain is the solution for frequent drivers. Pairing our e101 EPT/eCargo1 chain with one of our 3 mm wide sprockets and chainrings guarantees a mileage of 10,000 km+.

KMC Sprocket for Rohloff Wide 21T E-Bike

For Rohloff
Chrome-molybdenum steel
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e101EPT
Made in Europe

Item no.: BSRR00321
Size: 1/2" x 1/8" (single speed only)
Color: black

10,000km+:

It lasts. And it lasts.

And it lasts. The 10,000 km+ drivetrain is the solution for frequent drivers. Pairing our e101 EPT/eCargo1 chain with one of our 3 mm wide sprockets and chainrings guarantees a mileage of 10,000 km+.

KMC Sprocket for SHIMANO Narrow 20T E-Bike

Hardened chrome-molybdenum steel
For Shimano
Maximum performance that saves battery life
Perfectly matched to KMC chains
Recommended chain: e1EPT

Item no.: BSRS5020
Size: 1/2" X 3/32"
Color: Black

3500km+:

It lasts. And it lasts.

The 3500 HP+ drivetrain is the perfect solution for demanding drivers. The combination of our e1 EPT chain and narrow sprockets ensures a guaranteed mileage of 3500 kilometers and more.

Compatible with all 12-speed derailleur systems (except SRAM Eagle Transmission T-Type, 12-speed road/gravel)

Waxed with KMC GO

Perfect shifting thanks to Double X-Bridge

Includes MissingLink Connector

Item no.: BX12TT126W

Size: 1/2" X 11/128"

Color: Neo Chrome

Pin length: 5.2 mm

Weight per 110 cells: 268 g

Length: 126 links

X-Series

Your bike deserves it.

The KMC X series is designed with the specific characteristics of Shimano, SRAM, and Campagnolo systems in mind, meeting the most demanding requirements. Carefully designed and manufactured, X-Bridge technology, thanks to precisely chamfered plates, enables smooth drivetrains and perfect gear shifting in every riding situation. The X series is trusted by many top athletes in professional cycling.

Improve your ride with KMC GO WAX

Experience the next level of chain performance with our new, advanced dry wax formula. Designed to significantly reduce friction, improve shifting, and ensure optimal efficiency, KMC GO WAX extends drivetrain life by forming a durable microfilm on the chain that repels water and resists dirt adhesion.

For cleaner, faster and longer-lasting performance.

DURABILITY: Once applied, the wax dries to form a protective barrier that is more durable than oil-based products.

CLEANER RUNNING: Our waxed chains attract less dirt, minimizing common causes of wear and ensuring smoother operation.

SIMPLE MAINTENANCE: With minimal dirt buildup, your drivetrain requires less maintenance. Refreshing the wax is simple—just use a dry brush or cloth. No degreasing is required, just a simple touch-up with KMC GO WAX.

ENVIRONMENTALLY FRIENDLY: KMC GO WAX is biodegradable and contains no PFAS or harsh solvents, making it a responsible choice for both your bike and the environment.

Good for your ride, great for the planet

We're pioneering change with our premium chain line and are paving the way for a future where our entire chain range will be free of mineral oil-based lubricants. By producing around 5 million chains per year in the X-series alone, we'll soon save around 20,000 kilograms of mineral oil-based lubricants per year.

This change is just the beginning. Consider the enormous amounts of oil traditionally used to maintain chains and its impact on our environment. Our wax-based solution not only improves drivetrain efficiency but also significantly reduces the environmental footprint of our products by preventing harmful chemicals from entering our ecosystems.

The smooth-running KMC S1 chain impresses with its exceptionally low wear rates. Designed for use with all single-speed bikes, it's also engineered to withstand specific stresses. In addition to its excellent tensile strength thanks to reinforced pins, it boasts smooth and direct power transmission thanks to tight dimensional tolerances. The chain's smooth surface treatment positively impacts the chain's quiet running characteristics. The KMC S1 bicycle chain is designed for all standard single-speed bikes and ensures reliable operation on city bikes, touring bikes, and fixie bikes.

Compatible with all 11-speed derailleur systems

Diamond Like Coating

Waxed KMC GO

Slotted inner and outer plates and hollow pins

Perfect shifting thanks to the double X bridge

Contains MissingLink

Durability:

Item no.: BD11GG118W

Size: 1/2" X 11/128"

Color: Black/Green

Pin length: 5.65 mm

Weight per 110 cells: 244 g

Length: 118 links

DLC

DLC Technology: Extremely Durable, Extremely Precise. Unparalleled durability is achieved through precision-hardened and meticulously polished pins and inner plates. Our DLC chains are coated with a diamond-like coating, providing a long-lasting, visually appealing black beauty. Furthermore, this coating creates an exceptionally smooth surface for excellent shifting performance.

Improve your ride with KMC GO WAX

Experience the next level of chain performance with our new, advanced dry wax formula. Designed to significantly reduce friction, improve shifting, and ensure optimal efficiency, KMC GO WAX extends drivetrain life by forming a durable microfilm on the chain that repels water and resists dirt adhesion.

For cleaner, faster and longer-lasting performance.

DURABILITY: Once applied, the wax dries to form a protective barrier that is more durable than oil-based products.

CLEANER RUNNING: Our waxed chains attract less dirt, minimizing common causes of wear and ensuring smoother operation.

SIMPLE MAINTENANCE: With minimal dirt buildup, your drivetrain requires less maintenance. Refreshing the wax is simple—just use a dry brush or cloth. No degreasing is required, just a simple touch-up with KMC GO WAX.

ENVIRONMENTALLY FRIENDLY: KMC GO WAX is biodegradable and contains no PFAS or harsh solvents, making it a responsible choice for both your bike and the environment.

Good for your ride, great for the planet

We're pioneering change with our premium chain line and are paving the way for a future where our entire chain range will be free of mineral oil-based lubricants. By producing around 5 million chains per year in the X-series alone, we'll soon save around 20,000 kilograms of mineral oil-based lubricants per year.

This change is just the beginning. Consider the enormous amounts of oil traditionally used to maintain chains and its impact on our environment. Our wax-based solution not only improves drivetrain efficiency but also significantly reduces the environmental footprint of our products by preventing harmful chemicals from entering our ecosystems.

Compatible with all 11-speed derailleur systems

Diamond Like Coating

Waxed KMC GO

Slotted inner and outer plates and hollow pins

Perfect shifting thanks to the double X bridge

Contains MissingLink

Durability:

Item no.: BD11B0118W

Size: 1/2" X 11/128"

Color: Black

Pin length: 5.65 mm

Weight per 110 cells: 244 g

Length: 118 links

DLC

DLC Technology: Extremely Durable, Extremely Precise. Unparalleled durability is achieved through precision-hardened and meticulously polished pins and inner plates. Our DLC chains are coated with a diamond-like coating, providing a long-lasting, visually appealing black beauty. Furthermore, this coating creates an exceptionally smooth surface for excellent shifting performance.

Improve your ride with KMC GO WAX

Experience the next level of chain performance with our new, advanced dry wax formula. Designed to significantly reduce friction, improve shifting, and ensure optimal efficiency, KMC GO WAX extends drivetrain life by forming a durable microfilm on the chain that repels water and resists dirt adhesion.

For cleaner, faster and longer-lasting performance.

DURABILITY: Once applied, the wax dries to form a protective barrier that is more durable than oil-based products.

CLEANER RUNNING: Our waxed chains attract less dirt, minimizing common causes of wear and ensuring smoother operation.

SIMPLE MAINTENANCE: With minimal dirt buildup, your drivetrain requires less maintenance. Refreshing the wax is simple—just use a dry brush or cloth. No degreasing is required, just a simple touch-up with KMC GO WAX.

ENVIRONMENTALLY FRIENDLY: KMC GO WAX is biodegradable and contains no PFAS or harsh solvents, making it a responsible choice for both your bike and the environment.

Good for your ride, great for the planet

We're pioneering change with our premium chain line and are paving the way for a future where our entire chain range will be free of mineral oil-based lubricants. By producing around 5 million chains per year in the X-series alone, we'll soon save around 20,000 kilograms of mineral oil-based lubricants per year.

This change is just the beginning. Consider the enormous amounts of oil traditionally used to maintain chains and its impact on our environment. Our wax-based solution not only improves drivetrain efficiency but also significantly reduces the environmental footprint of our products by preventing harmful chemicals from entering our ecosystems.