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SP Dynamo SV-9 Front Hub to Suit Brompton - Silver

£99.99 Please note this product has selling restrictions to your country. was
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Questions & Answers (1) Q & A
6V 1.5W Ultra compact dynamo hub for wheel size 400mm to 658mm

Unique aerodynamic shape, low resistance and super light weight, make for and increadably efficient hub.

The unique aerodynamic shape of the hub has been optimized to a golf ball size, while attaining an unprecedented weight only 299g.

Output Notes from Shutter Precision
The SP-9 Series real output is 6V 3W for 20”, however for 26”/700C its output is very close to 6V3W but still a little bit less at low speed & therefore, it cannot pass German StVZO regulation. For the German market SP must get StVZO approval so the 9 series was used to apply the new regulation i.e. 6V 1.5W LED. And 9 series got 6V 1.5W LED StVZO approval.

Its output is definitely not 1.5W. Shimano 1.5W hub output is real 1.5W. We don’t like it & also we checked 1.5W with other dynamo lights. It is not enough. Although 9 series is marked with 1.5W, its real output is much higher than 1.5W.

- 7.9mm QR to suit Brompton (74mm OLD)
- Non-disk
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Questions & Answers (1)
Spoke Length
04 Dec 2016
I want to get this and a double walled brompton rim. Using the prowheelbuilder calculator I got lengths of 152.2 and 150.8 for double cross. Would you agree? Also which spokes would you recommend. My only preference is that they be silver and butted to some degree.
SJS Customer Service:

Those lengths would be the same as what we'd recommend. Unfortunately nobody produces butted spokes in lengths as short as this (apart from Brompton themselves who only do 151mm as a pack of 28 and not the 152 or even 153mm). For Plain gauge spokes we normally recommend the Jtek spokes.