My '78 Standard came to me with a 120 on the back, which I proceeded to use up. Then I replaced it with a more proper 110 and it made a big difference. The bike is much more "flickable", easier to maneuver around and toss into turns. It's the only size I run now on the rear. I've been using the Shinko 712 rears and they're OK. I tried a matching front but didn't care for it. It had a rather "vague" feeling to it and seemed to wander a bit through the 30 to 40 mph range. Instead, on the front I prefer the "V" pattern pioneered by Metzler, but Metzlers are too expensive so I get one of the knock-offs .....
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