Paul Components Pauls Melvin Single Speed Chain Tensioner
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No Longer Available
$71.95 (was $82.00)
The Melvin bolts to the frame where the derailleur would normally go and allows the use of a one speed rear wheel on bikes with vertical dropouts.
The Melvin also works with multiple front chain rings while maintaining proper chain tension. Of course this is no longer a single speed, but can be very handy for loaded commuting. Because the Melvine uses two pulleys, two chain rings with a maximum difference of twenty teeth can be used up front