I recently bought a 1996 ST1100 (standard) that the P.O. had fitted with a pair of Metzeler Roadtec Z6 radial tires. The handling was CRAPPY and inconsistent across a wide speed range (5 to 135 MPH). I replaced the radials with a new set of Bridgestone bias ply Exedra G547, G548 per Honda's recommendation (label under seat & owner's manual). The handling has improved DRAMATICALLY at all speeds & riding conditions! My conclusion: Bias ply tires work MUCH BETTER on this bike than radial tires. It is comforting to know that Bridgestone designed the Exedra G547 & G548 tires specifically for the 1996 Honda ST1100 (standard)!