Today I went out on my mountain bike and noticed the drag on the tyres. when I checked the pressures they were 30lb when the tyres can be set to 70lb. As I added the pressure and went for a cycle ride the diffrence was chalk and cheese. The ressistance was very little to road surface and the effort needed to cycle was easier.
My son James has taken a few pictures with his Nikon of the bike. See below
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