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Re: pic: Manually machinable one-speed gearbox
We did #25 chain in 2x2x.125 tube on our drop-center 6WD this season and had a good experience. No maintenance all season. There was some chain slap against the tube initially (16T sprockets and long chain runs; not a real problem but noisy), so we slid in a strip of UHMW to dampen that and now you'd never know.
We used a 2x2 because the frame rails in our design had minimal cross bracing due to the large opening for acquiring game pieces.
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