Shimano zee ?
Or just any crank with a single ring instead of 2 / 3?
Really just any crank that can take a widely available narrow wide chainring. Currently have a white industries crankset that has a 5 bolt 94bcd, a standard for which they don't really make n/w rings.
(Could just put a regular ring in there I know)
5-bolt 110BCD NW rings are ubiquitous/cheap if you prefer road ratios. Also depends on what the BB width is as to what cranks are available.
@Belagerent started
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Shimano zee ?
Or just any crank with a single ring instead of 2 / 3?