Sturmey Archer 70 mm drum brake wheels, X-SD[C] TTH50R & L with 100x12 mm axles, laced into two 16" (ISO 349x22) double walled, anodized, 6061T6 alloy rims with 36 S/S spokes. Can be used for front wheels on the StreetStrider 3R and on tadpole recumbent trikes, or used as a separate front hub on 2-wheeler (may require longer axle).