• What size ring do you want to run, and what length/type BB shell do you have?

    Standard road double outer ring chainline is 46mm - Alfine S500/501 HTII chainset is a good option if BB is 68mm but only down to 39T ring.

    Velosolo do a cheap Lasco 104 BCD 4 bolt crank - with a short BB (107/110 mm?) the outer ring will be in about the right place. Comes fitted with 36T and a chainguard, but you can fit rings as small as 32T (or maybe 30).

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