tough one, from an illogical point...which one makes you smile more, the one when you get on you think, "I forgot how much fun this bike."...keep that one Logically I would say get rid of the one that has the most overlap with the new project....ie new project can take larger than 28 get rid of the raleigh
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)