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Brompton seat post bung

Brompton seat post bung

Brompton Q part code: Q100045
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Brompton seat post bung

The seat post bung from Brompton is a rubber bung which fits into the bottom of the steel seat pillars / posts stopping the seatpost clunking on the ground when the seat post is lowered / put down

It also helps to prevent the bike rolling (on 16 inch wheel size Brompton models) when Eazy Wheels are fitted and you don't want it to! (e.g. On a train or slight incline)

It's also useful if you often park on tile / wooden floors as it will stop your seatpost chipping / scratching the floor.

Note: This seatpost bung will not fit the T Line / Carbon super light seatpost

Here's a very short video we made on fitting the Brompton seat post bung

Brompton Seat Post Bung Installation Instructions

Current (2017 onwards) model seatpost bung

No tool is required - simply push the bung into the bottom of the seatpost

Pre-2017 model seatpost bung (no longer available)

To secure the rubber bung, tighten the bolt with a 5mm allen key approximately 10 turns. The objective is to achieve a good tight fit without excessive bulging that could interfere with the folding operationTo secure the rubber bung, tighten the bolt with a 5mm allen key approximately 10 turns. The objective is to achieve a good tight fit without excessive bulging that could interfere with the folding operation

The kit used to contain a grey bung for use on aluminium seat pillars - this is (since 2012) no longer available and not included.

The black bung was for use with steel and (no longer available) titanium seat pillars

The easiest way to fit the rubber bung to the seat pillar is to have the bicycle folded, lying on its side, or inverted / upside down

Note: the rubber bung may be a tighter fit in (no longer available) titanium seat pillars and may require twisting to get it in up to the shoulder.

Before fitting the correct rubber bung assembly, check that the cone is just nipped up to the rubber bung but not starting to bulge the rubber. In this condition the rubber bung assembly should slide into the seat pillar up to the shoulder.

This required a 5mm allen key

We have been asked ... is this compatible with the T Line / Brompton carbon superlight seatpost - so made this short video to say (spoiler alert) NO!

Brompton 2020 Q part code: Q100045
Brompton Q part code: QSPBUNG[2]
Brompton old Q part code: QSPBUNG
Brompton old Q part code: QEZWBUNGA
Brompton part number: 9007361
Brompton old part number: 9037117