Compatibility is not so much an issue of the handlebar diamenter but the spacing between the handle bar riser clamp bolts for mounting the damper rod bracket and the height difference between the key block bolts and the top of the riser clamp. I have an Arrow damper on an S4R. The riser bolt spacing is 39mm or 1.535" . I'm not sure about height. I suggest calling a dealer. I got mine from Indy Superbike
http://www.indysuperbike.com/customer/home.php?cat=28447. Buying experience was good and their prices were the lowest I could find and they were very helpful and even called the factory when I asked them about compatibility.