Bar end gear shifters?

skyeflyguy
skyeflyguy Posts: 110
edited May 2015 in Road buying advice
Hi all,
some advice please on the above. I have some Bontrager RXL clip on extension aero bars. The diameter of the end hole is 20mm. Is this standard, and will all of the modern bar end shifters fit this? If so any recommendations on some that wont break the bank. Many thanks. :D

Garry.

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