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Other than the climb up Greenwich hill, a Brompton is ideal for the sightseer. Perfect London bike really. You won't be going very fast, I guarantee the sightseer will be the slowest 100km you will ever ride.
I know of other Brompton riders who will be on the ride.
I rode it on 20+ kg single speed sit up and beg japanese city bike last year.
Again, it will be your slowest 100km ever; 7-8 hours is about right, but you have 10 if needed.
Enjoy it!
Steamroller is in bits. Cross-Check is being re-purposed at the bike shop. So I am doing the Sightseer on the Brompton in the morning. Lets see if I can make it around on an SS Brompton.