Get that SPOT and carry it on your person. If you have get thrown and are seperated from the bike and injured badly your may not be able to get to a SPOT mounted on the bike. There was a guy who got thrown off his bike when he landed one ledge below the road while his bike landed about 80 feet below him in the creek bottom. He banged up pretty good but was able to crawl back up to the trail where is riding buddy came back and found him. If he had been solo he may have been there a long time before being found.