For a while I have been getting a clicking noise from the cranks and bottom bracket (BB) on the Santos Travelmaster - not particularly loud and only there when there was lots of pressure going to the pedals. It has done just short of 5000 all weather miles and gets a fair bit of hammering so I suppose a new BB cartridge was on the cards soon anyway.
It was on my list of things to sort but as I don't have the experience and required tools to remove the cranks and BB it was going to require some time and financial investment. Still, I like servicing my own bikes as far as possible so it would be worthwhile tooling up and learning how to do it. Well, the noise became continuous and a grinding sensation also developed over the last week, so I popped into the LBS today to arrange a date for them to sort it as I could not make the time.
As the Santos has an eccentric BB to tension the chain because of the hub gears, I expected a part would need ordering and I would have to drop it off later in the week. Well, Trevor (the LBS owner) said he could do it that afternoon and I could collect it later. And good as his word I picked it up before closing.
I now realise the sealed BB cartridge sits inside an eccentric plug which then fits in the BB shell. The cartridge is just a standard component and easily available. Total cost £22.00 and it feels like new - lovely. I still need to learn how to do it myself though!