. Many MTB riders find they need an additional light mounted to their helmet to see what’s around the trees in the singletrack (regardless of what system they have on their bars) The Lightest Full Production Riding Lights Available. At 85g you can’t even feel it on your helmet! Exposure lights are the lightest full production riding lights available on the planet. For weight, nothing else can compete. Developed by racers and riders, Exposure lights meet the needs of the modern day mountain biker. Gone are the days of carrying around that bottle battery pack or clumsy batteries Powerful Enough To Race. Gone are the days of your cables and leads catching on branches, or having a loose connection. Just clip these lights into place, and you’re off – simple. Using ultra lightweight mobile technology, Exposure lights are small enough to fit in your pocket, and powerful enough to race 24hr MTB events. Features: Ball jointed QR system makes for easy adjustment on the flyWeight: 20gBuy Exposure Accessories from Chain Reaction Cycles, the World’s Largest Online Bike Store.