Squirt Chain Lube
Squirt is wax based and noticeably decreases friction more than any other lubricant we have used. As an added bonus, you don't even have to clean squirt off your chain - just apply more whenever you need it!
Squirt lube is our second favourite chain lubricant. It has now been overtaken by Smoove, which we sell here. Smoove is more expensive but lasts much longer and is noticeably better at reducing friction.