Mounting Mirror on Grips With Built in Endcaps

The lock on ergonomic grips on your bicycle have hardware that fastens the grip to the handlebar. The right grip has an expanding end cap that is adjusted with a 5 mm allen key (A in picture below), while the left grip has a clamping collar on the inboard side that is adjusted by a 2.5mm allen key (B in the picture below).


It is not possible to mount a mirror on the left side without replacing the grips with the open end plug type. To mount a mirror on the left you have to cut/punch/drill a hole through 2mm of plastic and 2mm of rubber. Using a razor blade is a bit slow and dangerous, so the following methods are recommended:

Use a handlebar and hammer to punch a hole: slide the grip onto a spare handlebar (dont tighten the clamp) and use a metal hammer to hit the end cap a few times until you have punched a clean hole.


The resulting hole will be relatively clean and the right shape. Although this method seems a bit barbaric, it is the easiest way.

 
If you dont have a spare set of handlebars you can use a flat head screwdriver/punch and hammer from the inside This will take a few attacks at different angles to make a complete circle.


Using a drill is another option, but you have to have a fairly large bit to use or ream out a smaller hole. If you are using the small wedge for the mirror you only need a 9/16"/14mm drill bit, but for the larger wedge you need a 5/8th inch drill bit.


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