SUMC · 12-SPEED ULTRA-LIGHT CHAIN
SX12SL Chain, 12 Speed — Black Diamond
SUMC's ultra-light SL-tier chain for 12-speed drivetrains, hollow-machined for reduced weight and finished in a sleek Black Diamond.
10,000 KM
Rated Riding Distance, Oil-Sealed Pins
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Hollow-Machined Ultra-LightInner/outer plates and pin shafts are hollow-machined to a claimed 1-micron precision tolerance, cutting weight and improving dirt/sediment discharge.
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Hardened & Coated PinsPin shafts are hardened to 1600+ HV and finished with double-nitriding plus a titanium-nitride coating.
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What "SL" Means in the Name
SUMC's tier naming describes exactly how a chain is machined. This is an SL (Super Light) chain — it has hollow pins and cut-out side plates, the lightest construction SUMC builds for this speed. Chains marked EL keep the cut-out side plates but use solid, non-hollow pins, making them a little heavier but more affordable. Chains with no such letters in the name at all use solid pins and solid side plates throughout — the sturdiest and most affordable option. As more material is machined away, weight drops and price rises, so you can choose the tier that matches how much you're willing to spend to save grams.
Why SUMC?
The SX12SL is SUMC's hollow-machined ultra-light tier: inner/outer plates and pin shafts are machined to a claimed 1-micron precision tolerance for less weight and cleaner sediment discharge, with pins hardened to 1600+ HV and finished with double-nitriding plus a titanium-nitride coating. Every pin is oil-sealed (patent ZL 2024 2 1214393.1) and rated for up to 10,000 km of riding. The Black Diamond finish carries a 4-micron anti-corrosion coating, salt-spray tested past 1000 hours, and is one of SUMC's range of finish colors.
Specifications
| Speed |
12-Speed |
| Compatibility |
Shimano & SRAM 12-speed drivetrains |
| Chain Pitch |
1/2" x 11/128" |
| Finish |
Black Diamond, 4-micron anti-corrosion coating |
| Links |
126 |
SKU: SMC-SX12SL-BKDM
