Dear Sir or Madam,
I have converted two bicycles using your system: an old, relatively large Trek fitness bike and a very small, older Focus sports bike. Since the bikes were so different, I was able to thoroughly test the system and also compare two separate shipments.
In the first shipment, the wheel was not properly trued and had significant lateral runout, so I had to adjust it myself. That was annoying, though fortunately I was able to do the work myself and avoid a return. In the second shipment, the wheel was perfectly true.
The first shipment was missing the second rubber protective cap for the rear wheel's left-side bolt, whereas the second shipment included it. It would be great if you could send that missing cap to me in a small envelope.
On the other hand, the small rubber cover for the charging port at the bottom of the battery was torn off in the second shipment; that part had been fine in the first shipment. It is not a major issue, but these are minor quality defects that really shouldn't be there.
Overall, the goods in both shipments were packed very well and securely, and the delivery process went very smoothly.
With the large Trek bike, I had to mount the battery at the bottom of the seat tube; this made the cable run to the handlebars very tight, forcing me to mount the display centrally on a small stem. An option for an extension via an adapter piece would be ideal.
Also, the display mount could be designed with adapter rings to fit both smaller (22mm) and larger handlebar diameters—useful if one wants to mount it centrally or is forced to mount it there due to the placement of brake and gear levers.
I also missed having rim tape to protect the inner tube on the rear wheel. While not strictly necessary, it is highly recommended. Those are my suggestions for improvement.
The overall riding experience is excellent. Responsiveness is immediate, torque is sufficient, and the transition as you move beyond the 25 km/h assist limit is very smooth and well-modulated. It is all very well executed.
On flat terrain, the battery capacity easily lasted for over 50 km; so, despite the small battery—which is, of course, a great fit for sporty bikes—there is no cause for complaint here either.
It remains to be seen how the system holds up over the long term.
The price isn't low, but it is fair; however, it shouldn't go any higher if it is to remain an attractive overall proposition once you factor in the necessary installation and the prep work for what is usually an older bike.
In my view, you should budget a few hours—or even longer—for installation, as things rarely fit exactly as they theoretically should, especially with older bikes. That said, the Yose components themselves fit together perfectly.
My verdict: Despite minor flaws, I’m giving it 5 stars. Yose offers a great system at a reasonable price and has done a fine job. I hope it proves reliable over the long haul.