Originally Posted by
sweeks
Bike frames designed for derailleur-based drivetrains generally have more vertical dropouts. To adjust chain tension might require the use of "half links" or a chain tensioner. In the latter case, there's more drivetrain hanging down potentially in harm's way.
BikeFriday tikit, vertical dropouts, Shimano Alfine 11, Surly Singleator with the push-up spring.