Folding - Keeping chain on

4 videos • 267 views • by Bike Friday Being a travel bike rather than a folding bike, Bike Fridays were not specifically designed to keep the chain on when folding. (You can often put a dropped chain back on simply by putting the front chainring in the biggest ring and rotating the cranks quickly forward by hand). Here are some techniques for keeping the chain on when folding a Pocket bike.