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ROUTINE REPLACEMENTS
Planned replacement is advised to ensure both safety and good performance. The suggested intervals
between replacements are for bicycles subjected to normal use; the most appropriate timing depends on
the conditions of use and riding style. We recommend you use only genuine Brompton replacement parts for
safety-critical components. Ensure you adhere to the instructions on replacement.
ALUMINIUM COMPONENTS
As on other lightweight machines, aluminium alloy is used in the construction
of the Brompton, and this material has a finite design life before failure. In normal use, the risk of aluminium
fatigue failure is remote, even after many thousands of miles. However, the risk of failure increases with use,
especially with hard riding or other severe loading. As such a failure could cause injury, the hinge clamp
plates, handlebar, chain set, seat pillar and pedals should be replaced every 5,000 miles (more frequently if
they are subjected to hard use), and we recommend that these items are checked regularly.
TRANSMISSION
All Brompton bicycles have a self-adjusting, sprung chain tensioner to maintain correct
chain tension. Over time, the chain and sprockets will wear, commonly known as chain stretch; this will result
in inefficient and rough power transmission. We recommend replacing the chain and sprockets every 2,000
– 3,000 miles, but regular cleaning and lubrication will prolong the chain’s life. Never use a new chain on
worn sprockets or vice versa. To measure chain stretch, you may wish to use a chain stretch tool.
BRAKES
Cables do not have an indefinite life, and to reduce the risk of failure, replace the cables at
intervals of 4,000 miles or less. New outer-cables should be exactly the same length as the original; for best
results, use genuine Brompton-specific cables and have them fitted by an authorised Brompton dealer or
certified bicycle technician. Cables that are the incorrect length could affect the safety and performance of
your bicycle.
GEAR CABLES
These should be replaced at the same interval as brake cables. As Brompton cables are
specifically designed for Brompton bikes, only genuine Brompton cables should be used. Have them fitted
by an authorised Brompton dealer or certified bicycle technician. Cables that are the incorrect length could
affect the safety and performance of your bicycle.
BRAKE BLOCKS
When brake blocks are new they have grooves on the braking surface; once those
grooves are less than 1mm deep or no longer visible, the pads should be replaced. As brake pads are critical
to the safe function of your brakes, we recommend you have them fitted by a qualified bicycle technician.
Ensure you use genuine Brompton replacement brake pads, designated for use with the Brompton Electric.
TYRES
The risk of punctures increases with mileage and as the tyre tread starts to wear away. Once you
notice your tyre tread wearing thin, replace the tyre. This will reduce your chances of puncture and increase
pedalling efficiency.
LIGHTING
The electric cables used in the lighting system can wear out with the folding and unfolding of
the Brompton. When the cables become worn, they should be replaced by an authorised Brompton Electric
dealer. If your lights are faulty, have them inspected by a Brompton Electric Dealer, do not use the bike at
night if the lights are not functioning.
BATTERY
Over time the capacity of the battery will reduce, eventually the battery may need replacing. The
service life of the battery will vary according with usage.
The old battery should be disposed of responsibly, in accordance with local regulations.
Please contact an authorised Brompton Electric dealer, who will be able to assist you in
disposal and obtaining a replacement.
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