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Join Date: Oct 2016
Location: Cambridge UK
Posts: 852
Bikes: 1903 24 spd Sunbeam, 1927 Humber, 3 1930 Raleighs, 2 1940s Sunbeams, 2 1940s Raleighs, Rudge, 1950s Robin Hood, 1958 Claud Butler, 2 1973 Colnago Supers, Eddie Merckx, 2 1980 Holdsworth, EG Bates funny TT bike, another 6 or so 1990s bikes
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Valleys and Tape
Make certain you use the valley of the rim to reduce the width of the rim to be cleared. where possible. If the tire bead is on the shoulder you won't get the tire on.
Tape should not be covering the shoulder anywhere. If it does your tape is the wrong width.
Also an oversized tube will also thwart a smooth change as its extra bulk will get on the rim shoulder and/or fill the valley and thereby stop the tire bead sitting on the rim valley