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@fredtc
I have one of these frames with an OSBB
https://www.specialized.com/IL/en/crux-pro-frameset/p/49873? color=149310-49873
and these cranks RED 22 Crankset FC-RED-C1
https://www.wiggle.co.uk/sram-red-22-bb30-double-chainset
They have developed a creak. Do I need a spacer and if so what size?