Axles in FAG bottom brackets specified by Brompton have "had higher than expected reported incidence of failure," says the company, and is has issued a voluntary recall on the products.
"Although [they] still meets international safety standards this does not meet the standards which Brompton sets for its components," says a company statement.
The bottom bracket was manufactured between April 2014 and May 2017.
Brompton is to replace the bottom bracket cartridge with a new and tested part, free of charge to all affected customers.
The bikes affected have serial numbers from 1403284144 to 1705150001 and can be any model. Consumers are being advised to contact their local Brompton dealer.
"We would like to apologise for any inconvenience caused by this replacement," said the company's statement.
"We want our customers to be confident that in owning a Brompton bike, they are using the very best materials engineered to the very highest standards."