Due to a defect I had to replace the conventional dynamo. In bad weather (cold, rain, snow) the exchange Dynamo was regularly slipped through and then failed at inappropriate times. So I opted for the rated this hub dynamo with impeller at decent price. Immediately after ordering this product was delivered well packed after a short time. After unpacking I have the shaft rotated by what seemed to me quite stiff; but this is normal, as I have on relevant sites on the Internet klönnen up. Once installed (S-Bahn bike) with rim tape tubing, casing, this rotational stiffness virtually no longer relevant (!); a higher air pressure is important here. When shoring is to pay attention to the polarity, I had to reverse the polarity of the connections to the functioning. The light shines bright even at the slowest Slide. Now I'm extremely excited to have a good light in any weather conditions. I'm still, if necessary, install a front light with switch, because now the light is always lit with a rotating wheel.
