Oval chainrings on mountain bikes, read all about their latest revival at Singletracks. Several decades ago I had some success with these things on a road bike, but can't possibly imagine their "help" when climbing up technical roots on a mountain bike. I once test rode a mountain bike with Biopace rings back in the day, and the feeling was akin to the "help" you get from an over-eager chihuahua while trying to open a door to take the dog on a walk.
Onward and... sideways?
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