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N-gauge wheels based on those running on a GWR O23 open wagon photographed in "GWR Wagons Before 1948 Vol.1", Cheona Publications 2005. Nominally 15mm axles but probably slightly shorter in practice, depending on the printing of the pinpoint bearing. No guarantees about printability or strength, especially in first to try! UPDATE these are the same wheels as those on my O30 GWR steel open wagon and the 9'6" wheelbase chassis models, and on both of those they turned out fine in Frosted Extreme Detail.