Thinking of some longer rides/tours next year, I wanted to experiment with dynamos and phone charging without breaking the bank. I've just picked up a Shimano dynohub complete wheel from Decathlon for £30, which is less than I could buy a hub from anywhere else. I'm sure it's not in the Son or SP class but should give me a chance to do some testing. For charging I've picked up a power bug charger (powerbug . pl) for £28. I have plenty of usb battery packs so will be testing it's ability to charge those on rides this summer.