dwmckee

No. Watts are on the left scale, not the right. At 20 kph you are just above 4 watts it looks like. At around 12 KPH (~7-8 mph) you hit 1 watt output. At about 14.5 kph (~9 mph)you hit 2 watts. They sell 3 different output models and this is the middle one (Trekking). They sell a higher output unit that has higher wattage at lower speeds if you need it. I like this one because it has ample power in the ranges I ride in. If it had higher output I'd be putting in more of my own power and wasting the output. The other great thing is that when you are not using it there is zero drag (unlike hubs which always add slight drag).

I know this not for everyone, but I personally am pretty happy with it. It is on the pricey side, but that is not such a big deal to me as I am willing to pay for something that really solves a problem for me the way I like it.

I had a lot of opportunity for wet weather riding this spring and I can say with certainty that it has zero slippage problem in wet weather. It really is ideal for LED lighting. All of the other dynos on the market are older technology based on higher drain pre LED lighting. (All of the dyno models out there are basically unchanged for the past decade, and have not updated to optimize for the lower power needs of LED lights.)

I'll have to say that the mounting system is a bit crude, but once you have it set it is very solid and dependable. The only caution is that this is not for riding in mud that can get up to your rims. If that happens you are going to have some trouble with it working properly. I ride roads and crushed gravel and this has never skipped a beat.