As far as I am aware there was no such thing as 501 fork blades and in fact 501 only came in the 3 main tubes from Reynolds.
Anyway Raleigh only specced Reynolds fork blades on the 531 lightweight range, the 501 range got ATT23 Hi-Ten forks.
This frameset I've got is at least stickered up as having 501 forks, I bought the frameset in 95 / 96 from a local bike shoppe that was closing, and he used to sell the odd frameset, unbranded (apart from the tubing stickers) - like other bike shops.
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Of course, there's no guarantee that just because the stickers have been put on the frame, that they are so, I guess same for the frame itself - the guy who ran the shop, though, was fairly well known as a cyclist and bike shop owner, and not the sort to either be that uniformed, or make out things to be something they're not. But all the same, I can accept that just because a frame has been labelled a certain way, doesn't mean for sure that it is all that's claimed. All the same, I'm fairly sure I've other forks stickered up as 501 - but I suppose two things apply - my addled memory, and the stickers being accurate.
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