sean_q wrote:
> Re my Dnepr project, where I plan to install a chain-drive motor.
>
> One of my requirements is that no permanent or irreversible
> changes are made to the bike (so that it could be restored
> to its present condition).
>
> The current swingarm is set up for shaft drive, so it doesn't
> have chain tension adjusting slots. However, I have a left over
> swingarm from the crashed Triumph Thruxton which does.
>
> So one plan would be to fire up the angle grinder and cut off
> the tail ends of the Thruxton's swingarm to act as adapters.
> Then bolt them to the Dnepr's swingarm, which already has
> two built-in mounting points: a reinforced hole for the axle
> and another for the lower end of the rear shock, which is
> 3 1/2" forward of the axle.
>
> Will this work I wonder. The chain is under a lot of tension
> under acceleration, meaning that the swingarm is under a lot
> of compression. As well as some torsion due to the offset
> from the axle to the sprocket teeth.
Can't visualize that... the distance between sprocket teeth and axle
makes no difference.
> Too much force could either bend the Dnepr's swingarm
> (which was designed to withstand a different set of forces)
The shaft drive put bending forces on the swingarm, just like a disk
brake caliper, or drum backing plate anchor, would. The chain drive
conversion will remove those bending forces.
> or rip the adapters out of their mounting hardware.
> Can they be made strong enough?
>
> Realistic opinions appreciated.
Move the engine fore/aft to adjust chain tension.
> SQ
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