The Giro Athlon helmet was developed for competition but works great for XC racing trail riding and endurance racing. 23 wind tunnel vents plus smooth style and compact shape. Low profile P.O.V. visor and Roc Loc 5 fit system are some of the features that just might help put you on top. 425g medium. Small 20 - 21.7551cm - 55cmMedium 21.75 - 23.2555cm - 59cmLarge 23.25 - 24.7559cm - 63cm
If I do the following with my Garmin 800:
1. Upload a route to it.
2. Use the 800's route-wrench icon to enable Turn Guidance for the route.
3. Instruct the 800 to follow the route.
4. Start the timer and ride the route. Confirm that Turn Guidance prompts are appearing.
5. Cycle the power on the 800 ... Read More »