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TJ nailed it, it keeps the handgrip from rotating, and I've only heard of it being used on MX bikes but that doesn't mean street bikes have never had it done on them. that's actually a project for myself this weekend, my grips were a little cockeyed after running supermoto last week. Unless you actually experience the problem I don't see any reason to do it.
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I Don't try to explain to people why I ride a motorcycle
"For those who understand, no explanation is needed.
For those who don't understand, no explanation is possible."
'08 Yamaha WR290R/X
'09 KLX140L (wifes bike)
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