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Brompton Chains

Replacement chains for your Brompton

Current Brompton folding bikes use two different specs of chains:

We made a short video on A / C Line chain length calculation

Q: What length Chain do I need for my Bro...

Replacement chains for your Brompton

Current Brompton folding bikes use two different specs of chains:

We made a short video on A / C Line chain length calculation

Q: What length Chain do I need for my Brompton C Line or A Line?

A: The chain length for a Brompton C line can be worked out based on the number of teeth on the front chain ring and the number of teeth on the largest rear sprocket - as shown in the table below (or watching the video even further down)

Largest Rear SprocketChain requiredChainring sizeNote
12T/13T/14TQCHAIN096DR44TReduced gearing 3 speed / single speed
15T/16TQCHAIN098DR44TReduced gearing 6 speed
13TQCHAIN096DR46TVery old original chain ring (probably worn out)
12T/13T/14TQCHAIN098DR50TStandard 3 speed Brompton
16TQCHAIN100DR50TStandard 6 speed/Reduced gearing 2 speed
12T/13T/14TQCHAIN100DR54TIncreased gearing 3 speed
15/16TQCHAIN102DR54TStandard 2 speed/Increased gearing 6 speed

The Brompton chain for A Line / C Line comes with a PowerLink to make chain removal and installation easy

  • We (and Brompton) recommend changing the rear sprocket(s) whenever the chain is changed / replaced (as they tend to wear together, so if you change just the chain, you may well find that the chain slips on the old sprocket when under load)

All current Brompton bicycles use a 3/32 inch 8-speed chain (made for Brompton by SRAM) - Previously these 3/32 inch chains were only used on derailleur (2 and 6 speed) Brompton bikes

Q: What length Chain do I need for my Brompton P Line or T Line (and C Line Electric)?

A: The P Line / T Line (and now Brompton Electric P Line - 4 speed) comes with a choice of the following chains:

  • Brompton SL Advance 102 Links
  • Brompton SL Advance 104 Links 
  • Brompton SL Advance 106 Links

These are 10 speed chains

Please check the following table for the correct chain lengths

Chainring sizeGearing Chain length
564 Speed106 link 
54 4 Speed104 link
54 and 561 speed102 link 
504 Speed102 link
501 speed98 link

We made the short video below to show how to:

  • Choose the correct chain length / size
  • Remove an existing Brompton chain
  • Install a new chain on your Brompton
More Info

Brompton Chains We have 11 products.

Showing 1 - 11 of 11 items
Showing 1 - 11 of 11 items