The why, what and how of choosing and fitting a chainring for a Brompton bicycle.
Even with a '12% reduction' 44-tooth chainring on my Brompton, I was caught out on the hills on a couple of rides last summer, so for this year's exploits I've fitted a 40-tooth chainring.
CHAPTERS:
00:00 Introduction
00:21 Why change the gearing?
04:33 Chainring options
06:08 Tools for the job
06:39 Removing the old chainring
07:46 Brompton Chainring bolt hole profiles
08:18 Fitting the new chainring
09:11 Torquing the chainring bolts
09:36 Adjusting the chain length
10:47 Releasing the chain masterlink
11:44 Removing links with the chain breaker tool
12:37 Refitting the chain masterlink
13:15 Job done! Test ride
13:50 Outro