Yep Its known as a bacon slicer, Removed more sides of boots and bits of ankle bone than anything else. As far as I know they were banned from racing years ago, horrible things
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Riding with enthusiasm upon the ragged precipice of disaster
Is this an ATK? If that is what this is then I recall (in the late 1980s?) they devised a clever swing arm which maintained constant chain tension. Frame/engine mounting the brake may have reduced unsprung weight but what if the chain broke?
From the brake line setup it looks as if the rear brake pedal works both that sprocket brake and branches off and runs down the far side of swingarm indicating to the fact there may be a rear brake aswell.
More interesting to see how that chain angle works !
From what I remember it was ATK who used them. The chain and swinging arm had a pantograph type relationship so the chain had a more constant tension over the range of S arm movement. That was until the guide rollers gave out and you suddenly had a lot more chain than usual to deal with.
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Riding with enthusiasm upon the ragged precipice of disaster