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I'm not sure chain tensioners are even necessary.
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I tend to agree that you could get away without tensioners on your comp bot.
That said, our practice bot saw 2 hours of practice 4-5 days a week throughout the season. We saw significant sprocket wear and as a result had to make slight chain tension adjustments routinely.
We also have a special purpose demonstration robot that sees parade duty and special event duty.....we'd be in serious trouble without the tensioners.
Having the tensioners adds a piece of mind. Not to mention the ability to quickly change wheel sizes, which has happened more than once over the years.
