srw
It's a bit more complicated than that...
We got up to about 20 during the course of Ride London 2015 before (a) getting bored of counting and (b) dropping off the back of the main group of riders.I was away with the Tandem Club to watch Le Tour when it visited Yorkshire. One of my Tandem friends is plain speaking (she's from Lincolnshire after all):
"If I had a pound for every time someone said 'she's not pedalling at the back', I wouldn't have to fooking pedal."