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I vote for this sort of approach, using a chisel, stanley knife blade or screwdriver.
If you have an angle grinder with a cutting disk, obviously that is more fun, provides heat as you grind, along with a frisson of danger, sparks etc. Reshaping the race would allow other techniques to get more purchase.
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I've changed a few Langsters to use SRAM S300 cranks and hope BBs, but there is no reason why hollowtech or BB386 cranks wouldn't work. There are not many GXP/hollowtech/etc. cranks that take 144BCD chainrings - 130 and 110 are more common.
Miche bad. https://www.lfgss.com/comments/15573090/