Paladin.
Serious Thumper
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Sunny Southern California
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Kenda's site list their tires, width x diameter:
K657 Challenger Sport Touring: 130/90H-15 :: 5.2 x 24.1 140/90H-15 :: 5.7 x 24.8 K671 Cruiser Sport: 130/90H-15 :: 5.3 x 24.0 K673 Kruz Cruiser Touring 140/90H-15 :: 5.7 x 24.88
For Comparison: (manufacturer's specs) Metzeler ME880 Marathon: 140/80-15 :: 5.71 x 24.37 Dunlop D404 140/90-15 :: 5.85 x 24.73
The 140/90 Kenda's are nominally the same width as the 140/80 Metzeler and considerably narrower than the D404 that many have used with no problem. Nearly a half inch taller (diameter - only a 1/4" less clearance) but if you rub you can just crank up the preload on the shocks or replace.
The 130/90's are slightly smaller, can carry the weight, and should be slightly more responsive in turns.
Using the Metzeler as base, speedometer error would be -2.09% to +1.52% -- about 1 mph at an indicated 60.
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