Aerospoke

I read that it was so that you could sling your Krypto chain through the front wheel quickly to lock up. That's apparently why couriers started running them. Then fakengers caught on to the coolness.

This is all just from some journalistengers article.

Yes, this is one of the reasons why couriers become couriers instead of posties.

Due to decades of alcohol/substance abuse their hand/eye co-ordination is so poor, that they can't manage to post anything through a letter box. Handing a parcel over to a receptionist is obviously a less demanding task.

This is also carried over to their bikes. Posties run a traditional spoked wheel, while couriers have to run a tri-spoke or similar to make threading the chain or d-lock through the wheel easier.