For bar ends, IMO, you want the GR 2or3 series.. they are integrated.. not add-ons,
I use the GR3 on my M3L, it does not interfere with the bar fold down .
GR5 does ... You have to loosen the bar end/grip clamp bolt, and turn the long Bar end, to fold the mast down.
Dont need to fold the bar down and that wont be as important..
I got the double grip shift version, (Black rubber, Grey patch)
I, on M bars, Filled in the difference with short sections of round grip.. between grip end & brake lever band
the New Ones appear to have a Plug that can be left out ,
but still a Bar end Mirror can only be mounted on the side that does not hit the ground when bar mast is folded down,
that leaves option of Only a Right side Mirror.
In GP3 bio-cork , only right side is made shorter for IGH grip shifts, so you'd have to saw the inside end shorter..
so maybe get the razor saw out . "measure twice , cut once"
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Last edited by fietsbob; 11-17-16 at 10:37 AM.