I use a Giant Transend LX (the Honda Civic of commuter bicycles) to do my daily commute to work.  It's about 8 miles each way, mostly through neighborhoods and a few short stretches of busier roads.  I bought this mirror because it received excellent reviews, and I didn't think I could get used to a helmet-mounted mirror.  I'm pretty good about turning my head to check for traffic, but I thought that this might be better since I wouldn't lose sight of what is in front of me when I check.

I received it quickly after my order, but found installation to be less than simple.  For my bike, the end caps on the bars come off easily, but neither the large nor the small "wedge" that came with the mirror fit into the hole properly.  The large was too large, the small was too small.  Let me explain the wedge system.  While the photos show the mirror fitting snugly into the handlebar end, in fact it will not look like that for most bikes.  A piece with a larger circumference attaches to the bottom section using a bolt and screw.  The tighter the screw, the more the wedge-shaped piece moves toward the rest of the arm.  I found that if you tighten it completely, the wedge moves past parallel with the arm.  It's difficult to explain, but the wedge system is not well made.

I ended up ignoring both wedges and just used a nail to act as a shim between the normal arm piece and the handlebar hole.  It's stable and snug.  My only other option would have been to file down the larger wedge until it fit properly.

That said, now that it is in place firmly, the mirror itself is great.  It is just rounded enough to provide a view of a whole suburban street, and shaking is minimal.
I use a Giant Transend LX (the Honda Civic of commuter bicycles) to do my daily commute to work. It's about 8 miles each way, mostly through neighborhoods and a few short stretches of busier roads. I bought this mirror because it received excellent reviews, and I didn't think I could get used to a helmet-mounted mirror. I'm pretty good about turning my head to check for traffic, but I thought that this might be better since I wouldn't lose sight of what is in front of me when I check. I received it quickly after my order, but found installation to be less than simple. For my bike, the end caps on the bars come off easily, but neither the large nor the small "wedge" that came with the mirror fit into the hole properly. The large was too large, the small was too small. Let me explain the wedge system. While the photos show the mirror fitting snugly into the handlebar end, in fact it will not look like that for most bikes. A piece with a larger circumference attaches to the bottom section using a bolt and screw. The tighter the screw, the more the wedge-shaped piece moves toward the rest of the arm. I found that if you tighten it completely, the wedge moves past parallel with the arm. It's difficult to explain, but the wedge system is not well made. I ended up ignoring both wedges and just used a nail to act as a shim between the normal arm piece and the handlebar hole. It's stable and snug. My only other option would have been to file down the larger wedge until it fit properly. That said, now that it is in place firmly, the mirror itself is great. It is just rounded enough to provide a view of a whole suburban street, and shaking is minimal.