Current Brompton folding bikes use two different specs of chains:
We made a short video on A / C Line chain length calculation
Current Brompton folding bikes use two different specs of chains:
We made a short video on A / C Line chain length calculation
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 Sprocket | Chain required | Chainring size | Note |
12T/13T/14T | QCHAIN096DR | 44T | Reduced gearing 3 speed / single speed |
15T/16T | QCHAIN098DR | 44T | Reduced gearing 6 speed |
13T | QCHAIN096DR | 46T | Very old original chain ring (probably worn out) |
12T/13T/14T | QCHAIN098DR | 50T | Standard 3 speed Brompton |
16T | QCHAIN100DR | 50T | Standard 6 speed/Reduced gearing 2 speed |
12T/13T/14T | QCHAIN100DR | 54T | Increased gearing 3 speed |
15/16T | QCHAIN102DR | 54T | Standard 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
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
A: The P Line / T Line (and now Brompton Electric P Line - 4 speed) comes with a choice of the following chains:
These are 10 speed chains
Please check the following table for the correct chain lengths
Chainring size | Gearing | Chain length |
56 | 4 Speed | 106 link |
54 | 4 Speed | 104 link |
54 and 56 | 1 speed | 102 link |
50 | 4 Speed | 102 link |
50 | 1 speed | 98 link |
102 link replacement chain for your Brompton folding bicycle with rear derailleur (2 speed or 6 speed bike) and 54 tooth front chainring.
Brompton 100 link replacement chain for 2 or 6 speed Bromptons with 50T front chainring, or 3 speed with 13T rear sprocket and 54T front chainring.
Brompton 98 link replacement chain for 3 speed Brompton with a 50 tooth chain ring or 2 / 6 speed Bromptons with a 44 tooth chain ring
Brompton 96 link replacement chain with SRAM powerlink. For 3 speed with 12T,13T or 14T rear sprocket and 44T front chainring.
Brompton SL Advance 4SPD Chain - 106 Links
Brompton Superlight Advance 4SPD Chain - 102 Links
Brompton Superlight Advance single speed Chain - 98 Links
Brompton SL Advance 4SPD Chain - 104 Links
KMC 10 speed MissingLink - Re-usable This is just a pair of missing links