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I just installed a set of Dunlop Sportmax Roadsmart IVs on mine, but they haven't left the driveway yet for an impression.
Another Roadsmart III recommendation
Use the bridgestone sport touring tyres, the sport touring tyres have improved enough to cope with anything a sport might be capable of.
I’m not up to speed on the characteristics of current tires on the 1100 Sport and these bikes are very sensitive to front tire profile, but would add that it’s not necessary to fit the stock 70-series rear tire. A 60-series was used on the RS and there are a lot more 160/60-17 rear tires available than 70-series, and a wider variety of front tires available that match a 60-series rear. I believe the only reason they used a 70-series rear from the factory was to differentiate the Sport from the RS and make the RS seem more sporty by comparison. Along the same lines, with any tires I used on my 1100 Sport the steering was better and more neutral with the fork legs flush with the top triple clamp. Raising them made the bike fall into turns at max lean and reduced cornering clearance. I rode my bike to the limits of the tires and experimented a lot at the time. At that time SC2 compound (track day compound) Pirellis were very good, but in recent years I’ve been very disappointed in anything from Pirelli, after 1000 miles or so they’ve wrecked the handling of anything I’ve tried them on. Current Dunlops seem better, more neutral, for older Italian sport bikes that need a round profile front tire, not a pointy tire that makes the bike feel like it’s balanced on the head of a pin.It is amazing how much you can screw up the handling of an 1100 Sport with the wrong front tire.