SON Nabendynamo SON XS (straight-pull spoke version) 74mm Front hub

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Hub Data
Manufacturer SON Nabendynamo
Model SON XS (straight-pull spoke version)
Descriptor for Brompton
Position Front
Axle Type 8mm
OLN 74 mm
Spoke Interface Type J-Bend
Brake Compatibility rim brake
Drive Interface n/a (front)
Internal Gearing none
Dynamo Type 6v 3w (16"-20")
Spoke Hole Diameter 0 mm
Left Flange Diameter 44 mm
Right Flange Diameter 44 mm
Left Flange Offset 23.5 mm
Right Flange Offset 23.5 mm
Mid-Flange Offset 0 mm (centered)
Weight 380 g
Hub ID 331
Record Status Public
Created Apr 25, 2017 11:13am
hub dimension diagram
Note: this data is for the original version with evenly spaced slots. There is a newer variant ("semi-radial") as of 2016 that pairs the spoke slots at the hub slightly to create a slight amount of wrap angle in the spokes. This should very effectively resist rotational vibration harmonics in the wheel as it is being ridden due to the pulsing resistance of the hub under electrical load. -Karl

Dynamo for Brompton that uses STRAIGHT PULL SPOKES!! 28-slot "drilling", radial lacing only. (spoke length is measured from the underside of the head) spoke hole diameter is zero because it would offset the length calculation. Weight of 380g is with the stainless steel bolt-on skewer provided. -Karl
part image