My girl wraps one arm around me and puts one hand on the tank. Seems to work the best, they are sport bikes so there is nothing back there and they will be hunched over because you are also.My girlfriend and I are about 5'8" so I have to sit right up on the gas tank, and she has to lean way forward to hold on to me. Is there any passenger seat extensions or tips on how to ride with her so she isn't so uncomfortable?
+1+1 for getting her a bike of her own.. I'm 5'8" and dont have to be scrunched up on the tank.. maybe you should try adjusting your riding position too.
and whenever I'm a passenger, I just rest both hands on the tank, usually keep a few fingers interlocked just in case we take off and I need to hang on. If you are a good rider and she knows/trusts you, she shouldn't need to hang on too tight.