Fabian
Well-Known Member
the verdict is, the traditional bicycle derailleur and drive train is just not reliable enough for motored power and is too susceptible to damage while on the trails.
Are you sure about your comment, because i have completely engineered out the unreliability of a conventional rear derailleur system.
Secondly, i prefer the exposed drive train method because it's fixable on a trail, should you have a mechanical issue, whereas an internally geared drive train will leave you up a creek without a paddle if the hub suffers an internal failure.
The below links are but one demonstration of the reliability of a modified external rear dive train system.
The second last photo of the first web link shows the system operating with good efficiency even when packed with snow, though most of it had fallen off the drive train by the time the photo was taken.
http://www.motoredbikes.com/showthread.php?43829-Snow-ride-August-2014
http://www.motoredbikes.com/showthread.php?42774-Anti-chain-suck-amp-chain-stabilisation-system&highlight=rear+derailleur