[Bicycle Bob]

For people who want more brake cooling, it is fortuitous that wheel spokes resemble blower blades. For maximum economy, it is probably best to use smooth covers both inside and out. However, just the moon cover outside will help a lot, and probably improve airflow along the rest of the car. I've never understood why people pay extra for wheels that could be as light as minilites, but are styled instead, to some intermediate weight, somewhat lighter than steel pressings.