SP Dynamo Hub PD-8 (Quick Release, Disc)

The lightest and most efficient!

*Quick release not included.

SP 8 Series hub dynamos

SP hub dynamos are unrivaled in every sense of the word. They are more efficient, technologically advanced, simpler and lighter in weight than any competing hub dynamo by class.When lights are on, the P-8 (3W) and S-8 (3W for 20”and 2.4W for 700c) hub dynamos achieve an incomparable efficiency of 72 percent (i.e. watts of mechanical energy converted directly in watts of electrical energy - minus wasted muscular effort that would otherwise be propelling rider and bicycle forward). Before the introduction of the PD-8X in 2013,SP’s 8 series hub dynamos were the most efficient available on the global market.To our knowledge, they remain the most efficient in the world - except for the PD-8X. SP P-8 and S-8 series hub dynamos are respectively 7 and 17 percent more efficient than top German and Japanese rivals when measured at 15 km/h (9.3 mph), the “gold standard” specification set under the rigorous German StVZO standard for hub dynamos.

 
P-8Efficiency graphs

Perhaps more significant is the fact that the 8 Series hub dynamos have dramatically less drag when lights are off in comparison to the same top-of-the-line Japanese and even German hub dynamos. At 30 km/h (18.6 mph), the P and S series hub dynamos generate well over 50 percent less drag than the nearest Japanese rival and nearly 25 percent less drag than the most efficient German counterpart. Notably,they produce less total drag in comparison to competing hub dynamos at all speeds tested while also producing more power! Moreover, this efficiency gap widens considerably at speeds above 20 km/h.

For warranty.