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if you are using a rear qr skewer, turn it round so the lever is on the drive side. if you then point it forwards and down, this can provide sufficient pressure upon whatever form of arm & sprocket you decide to use without the need for a spring system. i reckon a couple of bits of moulded carbon and a kcnc jockey wheel would do the trick quite nicely.
it's a bit difficult to describe, but i discovered the above method quite by accident when my ss tensioner spring died. as a trail-fix, i swapped the qr round to push the tensioner down and it quite happily stayed there through all type of riding. best of all is that it makes it very easy to remove the wheel as there is no spring to work against.
taking it one step further, i reckon you could even fabricate a qr skewer where the handle doubles up as an arm on which the tensioner jockey wheel can be mounted.
I think is someone was very creative they could make one that works very well and very light.
I have plenty of kcnc jockey wheels to use
I use the controltech non qr skewers so you can get some serious clamping force if required.
My previous single speed ran a magic ratio, unfortunately it's not an option on this bike ah well
It's still under 14 lbs
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