Brompton 50T spider chain ring / guard
This 50 tooth chain ring is the standard on the 3 speed (utility) and 6 speed (explore) Brompton folding bike
The "new" Brompton "Spider" crankset was introduced on new Brompton bicycles at the beginning of 2013 (so not really that new any more!)
This is a replacement 50 tooth chain ring complete with chain guard
Colour: Silver (also available in black)
It can be used to replace the 44, 50 or 54 teeth chain rings on a "spider" type crank. (a different chain length will be required if you change the chainring size)
Brompton Q part code: QCHRINGA-SPI-50
Brompton part number: 9020171
This is now also available as a black chain ring (introduced on Brompton BLACK edition bikes) - using Brompton Q part code: QCHRINGA-SPI-50-BK
The below video show how to change the Brompton chain ring
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