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My favorite cvt design was one that Honda came up with a number of years back for a down hill bicycle, it had a cam that ran rocker arms with moving pivots, so the leverage could be changed, those rocker arms then pushed on ratchets that turned the out put drive shaft, the only draw back of it was that it was to heavy for a bicycle.
I have three Snapper push lawn mowers with self propel that uses that type of drive, it works ok, but you can defently see the wear, we've owned them for around 15 years and I've replaced that rubber wheel at least 4 times, I would guess they might last 50 hours of use, the reason is that the rubber wheel is rolling on a disk, so it's trying to twist the mating suffice, this causes alot of wear.
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