Join Date: Oct 2009
Location: England, currently dividing my time between university in Guildford and home just outside Reading
Bikes: Too many to list here!
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Partly correct. Your stem quill is 7/8", which is 22.2 mm. The steerer tube of your fork is 25.4 mm, which is 1".
There may be another problem though. I seem to recall some Raleigh Sports using a non-standard clamp size for the handlebars, 15/16" (23.8 mm) rather than the more common 1". This won't affect the stem size, but you may need to replace the handlebars as well, as the 23.8 mm clamp hasn't been used on modern bikes for quite a while, meaning you almost certainly won't find an adjustable stem in that size (I doubt they were ever made). Do you have a set of calipers to measure the diameter of the clamp area on the handlebars?