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grams in reply to @Eseman
Until only a couple of years ago the Brompton owners’ manual said this.
1. ALUMINIUM COMPONENTS: as on other lightweight machines, aluminium alloy is used in the construction of the Brompton, and this material has a finite 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 and chainset should for safety be replaced every 5,000 miles (more frequently on any machine subjected to hard use), and we recommend that these items are anyway checked regularly.
The current manual doesn’t seem to have a specific mileage number in it anymore.

I’ve not seen such a warning on any other bike part. As the bicycle technological clock at Brompton stopped in about 1982, I suspect it reflects received wisdom at that time.

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hugo7 in reply to @grams

Until only a couple of years ago the Brompton owners’ manual said this.

Bit late to the party, but my dad took his Brompton to get a major service and the guy apparently said the alu parts should be replaced.

I assumed it was just a shake down. But now it looks like I may have been a bit harsh.

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