What do I need to change a Bottom bracket on a new(ish) Brompton?

[mickle]

I thought it might need a specific tool as it does have crenellations on the outer rings, but it also has splines which look like they'd take a Shimano bb tool.

And yes, I'm aware it's minging.

View attachment 143925

I could have sworn that you said it was new.

 

[shouldbeinbed]

I thought it might need a specific tool as it does have crenellations on the outer rings, but it also has splines which look like they'd take a Shimano bb tool.

And yes, I'm aware it's minging.

View attachment 143925

Thats the FAG type I alluded to. Park Tools BB4 (tho check to be sure)

You're best off nipping into LBS and asking to use theirs as Brompton have moved away from that to standard Shimano tool style and upgrade BBs will not be of the FAG type either.

 

[Pat "5mph"]

Use a pipe wrench, carefully.

I did this, with the aid of an old t-shirt as a buffer to avoid damaging the ring.
Not on a Brompton though, just some old bike I was dismantling.

 

[Kell]

My Shimano BB tool fitted perfectly.

(one of these type)

They're only nylon cups, but the drive side was loose. Nipped it up a bit, but have also ordered a new Shimano one.

The UN55 seems to be pretty much bullet proof, so I think it's worth doing.

 

[Kell]

I could have sworn that you said it was new.

I meant new as in 'the new style' with the spider chainring as opposed to the old one piece version.

Anyway, tightening it up has cured the clunk, but I'm still going to fit the new BB. For the sake of £15, it's worth doing.