I have gained these Axa-side runners for my trekking. I have forsaken me here only to the product reviews my preorder. After a very fast shipping process I was finally able to grow these my bike. Apparently a very robust construction and a very smooth-running roller. In short: Dynamo mounted, tested and running top. Low noise, good pressure on the tire and a very good light output give this Dynamo pluses. Negative I can not yet tell.