Did you know that Bias tire is the OEM tire for ZEPHYR1100?
The standard tire for ZEPHYR1100 is Bias. The standard tire is recommended for city riding, touring, and a little bit of mountain climbing.
Of course, Radial may be stiffer and have a lot of design features that you like, but is it really right for your motorcycle?
If you are using a motorcycle with a stiffened frame and reinforced suspension, you may want to change to a Radial. I have also changed to Radial and increased the size of my tires, but I felt that if you are riding a NORMAL bike, the standard tires are better for balance.
It's just my opinion, but I think Bias tire is better than Radial right now.

