Tom (the AMFLYER one) -- that Johnson rubber roadbed measures 66 mm across, so using my value for the centerline radius of 488.6 mm plus 33 mm one gets a radius to the outer edge of the rubber roadbed of 521.6 mm or 20.5 inches -- so I can see how you'd have trouble getting track with the roadbed plus a 10 inch straight into 50 inches -- 51 would be tight.
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