The best touring tire for the 451 wheeled bikes. It also has enough tread for riding gravel fire roads. +
Bike Friday bikes can be built with either 451 and 406mm rims. Both sizes can be referred to as 20" wheels, whit the 451 ibeing a larger rim. Confirm you have a 451 or a 406 before ordering by looking on the side of your current tire to confirm the rim diameter.