I actually love riding when its between 50 - 55. I will, if forced, ride when its in the high 20's/low 30's but that is cold for me. Living in sunny CA I don't have much experience with really cold weather. On a trip through Utah, one morning started out going downhill when it was around 28 degrees. My hands and brain stopped working and I had to find someplace to warm up before travelling on. I think the downhill was the problem. Had I been climbing, the temp would probably be OK.