This is now by far our most popular dynamo hub, going into about 90% of our dynamo wheel builds. SP dynamo’s hubs are not only the lightest but also the most efficient 3w hub on the market, and are virtually identical to the BioLogic Joule 3. The lightest SP dynamo weighs in at an unprecedented 360-390g (lighter than even the little Shimano S701 1.5w!) while attaining an unmatched efficiency of 72%. These 3w dynamo hubs are premium products designed and engineered for the most demanding cycle tourists, commuters, and enthusiasts.
Their performance and reliability are on par with Schmidt. There's one exception: the Schmidt will start producing light at around 7 mph, whereas the Shutter Precision at around 11. The bigger your wheels are, the higher those minimum speeds, and the converse is also true.
Although various colors are occasionally available, usually we can get them only in silver or black.