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Cheap Monday stock 30 inch inseam as a standalone size rather than a cut-down 32,34 or whatever. About £50 and certainly fit the 'skinny' requirement.
Haven't tested them as a cycling option personally but some of the styles come in stretch-denim (same/similar fabric composition as much of the Levis Commuter range) which must offer some benefit for spending time in the saddle.
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Have you considered Hiut Denim? £135+, but made by actual people in Wales. They do repairs, so they might do alterations or custom.
Fucking jeans.
For the last 3 years i've been wearing ASOS jeans and they been great, at lasting around 4-6 months a pair for sub £30. the last two pairs however have been different, slightly different fit and material (too long, even in the smallest, 30" leg) and have barely lasted 2 months (this isn't even cycling in them very often)
Where can I get DECENT pair of black, skinny jeans (like.. actual skinny not Levi 511 which are slim at best) that do 30" leg (32" and then altered tends not to work for me either, too baggy at the ankles) for up to £100?!