I have heard the rear hub and bearings can be affected by cold weather. I think when it gets too cold the grease is not effective at lubricating the bearings and the hub tends to spin freely and not catch when you pedal. Is this not correct? If not then please correct me and explain what does happen. At what temps. does this happen or has happened to you? I understand there are lot of variable. Things like actual tempp. wind speed, wind chill, area of the country, humidity, etc. I just need to know at what temps. has this happened? Also is there a grease or method that would work and prevent this? Would this grease work in warmer weather as well?