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KMC X12 Chain 126L Grey

Key Features

12-Speed Precision Engineering
Optimized inner and outer plate design specifically for 12-speed drivetrains, ensuring flawless shifting performance across the entire cassette range.

Sleek Grey Finish
Sophisticated grey coating provides excellent corrosion resistance while offering a modern, understated aesthetic that complements any build.

126-Link Extended Length
Generous link count accommodates full-suspension mountain bikes, long-chainstay gravel setups, and oversized chainring combinations without modification.

Universal 12-Speed Compatibility
Works seamlessly with Shimano, SRAM, and Campagnolo 12-speed road and MTB systems for maximum versatility across brands.

Enhanced Durability & Longevity
Advanced surface treatment and precision manufacturing deliver extended wear life, reduced friction, and consistent performance in all riding conditions.

Brand: KMC

Type: 12 Speed

Availability: In stock Out of stock

Delivery: 2-3 working days

Product variants

Regular price: £31.89
Sale price: £31.89
Regular price
Unit price: per

Quantity

Description

X12 Chain 126L

This 12 speed KMC chain is high performing and extremely durable.

The Non-Directional design makes it independent of direction which allows maximum compatibility on MTB or Race bikes. With its unique stretch-proof treatment, the durability has been enhanced massively by reducing the attrition between the inner plates and pin. As a result, chain life has been significantly prolonged. The upper bridge forms a slant vault parallel to the tip of tooth movement. This vault shape makes the tooth and chain engage much more precisely.

Gold Ti-N Coating

Titanium nitride is a chemical compound of titanium and nitrogen. The ceramic material of typical golden yellow colour is characterised by extreme hardness and corrosion resistance. This special coating has an ultra-smooth surface, and is extremely durable.

Silver Nickel-Plated Coating

Nickel is an alloying metal primarily used for refining steel. With corrosion resistance, enhanced hardness, and proves highly effective as rust protection.

Features:

Titanium Nitride (Gold) coated or Nickel Plated (Silver)
Includes non-reusable 12x Missing Link
Size: 1/2" x 11/128"
Pin length: 5.2mm
Double X Durability
Non-directional

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

Shipping & Returns

Our Promise

All orders are carefully prepared and dispatched within 1-2 business days. Once your package is on its way, you will receive a confirmation email with a tracking number so you can follow its journey.

Same‑Day Dispatch

Orders placed before 2pm are dispatched the same day via Royal Mail Tracked 24.

If there are any stock issues, we will contact you by phone or email to update you and reorganise delivery.

Shipping Costs

• Orders over £50 qualify for free shipping.

• Orders under £50 have a flat delivery fee of £3.00.

Letterbox‑Friendly Items

Any items that can be delivered through a standard letterbox will be sent via Royal Mail 24 for convenience.

Optional Special Delivery Upgrade

For urgent orders, you can upgrade to Royal Mail Special Delivery Guaranteed by 1pm.

This upgrade is available at checkout for orders placed before 2pm.

FAQ

Q: Is this chain compatible with my 12-speed drivetrain?
A: Yes, the KMC X12 works with all major 12-speed systems including Shimano, SRAM, and Campagnolo for both road and mountain bikes.

Q: How many links do I need for my bike?
A: This chain comes with 126 links, which fits most bikes including full-suspension MTBs and bikes with longer chainstays. You can remove excess links to fit your specific setup.

Q: What's special about the grey finish?
A: The grey coating provides excellent corrosion resistance and durability while offering a sleek, modern look that pairs well with contemporary bike aesthetics and components.

Q: How often should I replace my chain?
A: Chain replacement depends on riding conditions and maintenance. Use a chain checker tool regularly - replace when wear reaches 0.5% for 12-speed systems to prevent drivetrain damage.

Q: Do I need special tools to install this chain?
A: You'll need a chain tool compatible with 12-speed chains. KMC chains typically use a master link (sold separately or included depending on version) for easier installation and removal.