Jax Rhapsody , if you’re looking at an eight pound set of mag wheels for a single speed conversion, and you like it because low maintenance is a priority, while low weight is not… I say give ‘em a try. They are really heavy, by any bike standards. Obviously would not be heavy on a motorcycle or bulldozer, but as you noted YOU will be the power source. They will also be pretty tough; you shouldn’t have to worry about riding carefully to avoid damage. Personally, I don’t like wheels that heavy on any of my bikes. The sweet spot between light weight and durability for me is a lot lighter.