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lesterama
gbj_tester
ltc
S300 Courier cranks have a narrow (40.5mm) chainline. Omniums are 42.5, which would solve the chainring clearance but the spider would crash the chainstay because Omniums.
Swapping to a normal road crank using the outer ring opens up loads of room. Obviously you then have to fuck with the sprocket chainline too, but it's worth it.