I'd like to consult the veterans of above 600km brevets for any insights re chain.
Anything along the lines of:
Do you use a fresh chain?
Do you carry some oil and brush/other tool to be used after a few hundred km?
What do you have in the support car / Drop bag?
Do you carry a spare chain on the bike, or only in the car, and hope to get by, by removing a couple of links?
I'll be calmer if I'd use a chain scrubber with degreaser and re oil after, say, 600km.
Any other chain related comments will be most welcome.