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@ChrisNW
Beware of confusion between chain tensioners and chain tugs. Tensioners are just for single speed and mean you can run SS with vertical dropouts. Chain tugs are what keep your axle from slipping forward, particularly on cromed or unpainted frames. Tugs are for maintaining chain tension on a fixed-wheel setup. Different combinations of track nuts and droputs have varying degrees of 'bite', those with little bite will need chain tugs. You may also need chain tugs if you like putting the power down from a standstill.