Avid Speed Dial 7 Bike Bicycle Brake Lever Single Left or Right
Forged Aluminum Handle.
Speed Dial leverage adjuster.
Left or Right.
These are really nice feeling levers with a unique twist. You can adjust how much cable you pull. This allows this lever to be work either with V Brakes which have a 1 to 1 pull or with Cantilever and Road bike brakes which have a two to one pull.
The only negative of this lever is you need to take your grips off to put this lever on the bars. The advantage to that however is you can use this lever either as a left or as a right without the Perch getting in the way of your thumb.
Quote from the Avid Website
The squeeze of our levers is what dreams are made of (you know what kind we’re talking about). Most of can be swapped to run either front or rear—which is convenient if you like your brakes reversed—or a Godsend if you bust a lever in the middle of the woods. Plus they are easy to install, simple to set up and a pleasure to pull.