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Brompton

Brompton SL Advance Chain — 106 links · 56T geared

Brompton SL Advance Chain — 106 links · 56T geared

$45.00
$45.00
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Frequently Asked Questions

4-speed and 12-speed bikes fitted with the 56T chainring, which is an upgrade ring most often seen on the T Line. Bikes on the standard 50T or 54T ring take the shorter 102- or 104-link SL Advance chain instead. Not sure which ring you have? The size is usually stamped on it, or see the Brompton chain guide.

Every bike with Brompton's 4-speed or 12-speed derailleur drivetrain: the P Line and T Line (including single-speed versions), the Electric P Line from 2023, and the C Line and Electric C Line from 2026. It's a narrow 10-speed chain made for Brompton by YBN.

No. Hub-geared A Line and C Line bikes (1, 2, 3 and 6-speed) use a wider 8-speed, 3/32-inch chain in 96, 98, 100 or 102 links. Use the Brompton chain guide to pick the right one for your chainring and sprocket.

Usually, yes. The 4- and 12-speed cassette sprockets wear with the chain, and a new chain on worn sprockets will skip under load. Replace the chain at 0.5% wear on a chain checker and the sprockets will last several chains; wait until it skips and you'll likely be replacing both.