After having the heated grips fitted to my Touring, I installed a pair of Grip Puppies. Less vibration and very comfortable also no issues regards the operation of the heated grips.I have the OEM heated grips for the California Custom and they are 34mm in diameter. I have the exact opposite problem in that these grips cause my hands to cramp with the small radius. I have ordered some grip Buddies Super Shark Grips Wraps in hopes of increasing the diameter. I have no problems with cramping on my BMW R80 equiped with Emgo GT Touring Grips.