I came across this short article on a facebook post the other day and although it doesn't credit the author I felt that I was able to quote it here as it is in the public domain;
~Riding with the rear pegs down.
This superstition takes a lot of forms and meanings but is usually brought up for discussion after an older rider tells a newer biker they should only have the rear pegs down if someone else is riding on the motorcycle with them.
The most basic superstition has a rider giving the dreaded motorcycle gremlins a place to put their feet while riding along and waiting to cause mischief. This does lead us to question whether your Ride or Guardian Bell isn’t strong enough to ward off the gremlins before they have an opportunity to get comfortable with your rear pegs.
Another version warns a biker invites spirits to ride with them by leaving the passenger pegs down while riding solo. Its an interesting superstition as riders are asked to do just that if they are involved in a funeral procession for a biker who has passed away. As with humans, bikers should be picky which ghosts they let ride with them it seems.
The most humorous response to this superstition are the bikers that tell you the only reason keeping the rear pegs down are bad luck comes from something definitely living. Having a biker’s other half ask who they’ve been letting onto the back of their motorcycle seems too much of a curse to let the rear pegs be anything other than up when riding solo.~
I personally put the rear pegs up if Janet is not going to be riding with me but that is not through any superstition, just a habit and I had not heard of the tradition of leaving them down during a funeral procession either.
It's an interesting topic for discussion though, what do you think?