Riding your bike at night can be dangerous. Revolights wants to change that with their new wheel system. These wheels are the second generation Revolights and they are mounted onto Weinmann DP18 700C rims atop Shimano 2200 hubs. This allows you to remove your old rims, and put these on – giving you more visibility to those around you. The USB rechargable battery will power the 12 LEDs per ring for up to 4 hours.