With one week to Around The Bay, I've got to work on my bike. First up is removing a pair of slightly damaged cranks that are very firmly stuck on... leaving a dremel as one of very few options for removal.

Then it's a chain and sprocket replacement on both the Bosch side and Shimano internal geared hub - with one part "not to be done by the end user".

Then, while packing, I explore exactly why tyre inflation cartridges use CO2 - first covering some other alternatives, then the reason why it's used - despite the fact it has the major disadvantage of just leaking out of the rubber!

And then the bike's ready to go for Around The Bay. But I've got my reservations...