Shimano Alfine IInternally Geared Hubs
Comments
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Most hybrids with MTB standard rear dropout width (135m) can be retrofitted BUT you generally need a chain tensioner.
You dont get the clean chainline and are stuck with a pulley system.
The Alfine disk is standard MTB fitting (centrelock)
Some manufacturers sell Alfine bikes like this, best avoided in favour of a sliding dropout, horizontal dropout or eccentric bottom bracket.0