Hot answers tagged mountain-bike
One possibility is that the hub's freewheel mechanism has broken. Maybe it's fixable with some spare parts or you may need a new freewheel hub body or a new hub altogether. Your LBS will be able to assess the situation. It looks like this: https://www.google.gr/search?q=mtb+freewheel+hub+body&tbm=isch
The nice people at specialized.com have a archive section with pictures of all the models produced since 2008. Go to the web site and scroll down to the bottom of the page. There's a Support section with Bike Archive as the last item. Answer shamelessly stolen from here.
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