The manual does indeed say 18 psi front and 28 psi rear (G5 with stock Avon Speedmasters). That's solo - it suggests a couple pounds more with pillion. I always felt 18 was too low, and put about 22, later increased to 26. Improved, but that front Speedmaster is squirrely by nature I think.Running with 18psi at 60 mph and above could well explain poor handling!I don't know what the C5 manual says, but Roadriders on a G5 are good at 27 front & 29 rear. I wonder why they used different tyres on these two bikes? Especially putting the cool modern tyres on the more retro looking bike
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