Hard currency illustrates illumination information
I’m building a new dynamo wheel and thought it would be interesting to compare the weight with the Li-Po battery LEDs I used previously.
Based on the Shutter Precision PV8 hub (not the light weight SV8 version), I expected the dynamo setup to be quite a bit heavier, but in fact the weight difference was just 25g.
On the lights themselves, the IQ Cyo is about 30g heavier than the Ay-Ups, but the RSP Astrum is 30g heavier than the Toplight Line Plus rear light, making that a wash.
Let’s throw in 10g for the tail-light wire and you get 35g – roughly the weight of five 2p coins. If you wouldn’t throw away that much change after a commercial control or cafe stop, you probably shouldn’t try to justify a battery setup on weight grounds alone 😛
(Yes, it’s true that there are many other reasons why you might prefer batteries – I used them exclusively myself, until recently).
Of course, the battery pictured is only just enough battery for one summer night. In reality I took two on all long brevets, which tips the scales in the dynamo’s favour by a cool 100g…
This doesn’t touch on the two real issues that split dynamo / battery use: drag (which is now the subject of a dedicated article on hub dynamo friction) and efficacy, but I wanted to take a few minutes to illustrate that what many percieve to be a significant downside of dynamo use just isn’t…
Even Wiggle are getting in on the hub dynamo action: get yours here.