[Dan Richardson]

Another way to tension chain besides Slotted wheel mounts and tensioners is an adjustable gearbox.

This year we built our gear boxes on the frame with a sandwhich mount and shims. WHen the chain would get loose we could slide the gear box up or down ( depending on location of the 2nd sprocket ) and tension that way. It worked out really well for us. It ended up being much easier than sliding every wheel like we used to in old chain drive designs. Just loosen a few bolts, slide, tighten the bolts up again and walla Tight chains.

Its probably late to consider something like this but Its just an interesting idea that works really well.