De brukar ju ange hur hårda/mjuka däcken är i (Shore) Durometer men enligt den här artikeln så är naturgummi sämre än syntet vad gäller att bli bakelithårt i kyla:
http://www.bikeradar.com/mtb/gear/a...s-and-tricks-for-tackling-extreme-cold-39256/
There are few materials whose properties are more drastically affected by a huge downward swing in temperature than your tires — specifically, the rubber that so tenuously grips the road or trail. Whereas in more reasonable conditions your tread might willfully conform to the ground and keep you upright, it will harden up in ultra-cold temperatures and leave you wanting for traction right when you need it the most.
Many tire companies publish the specific Shore durometers of the rubber compounds used in the tread. Higher numbers indicate a harder compound and usually, companies go with a medium option so as to balance grip, durability, and rolling resistance. If you plan on regularly heading out this winter, consider switching to tires with a softer compound than what you'd normally run for a little extra traction.
Rubber compounds harden in cold temperatures. Consider switching to tires with softer rubber to enhance grip during wintertime riding. Also think about moving to a wider tire and decreasing operating pressures, too
Rubber compounds harden in cold temperatures. Consider switching to tires with softer rubber to enhance grip during wintertime riding. Also think about moving to a wider tire and decreasing operating pressures, too
Specialized tire guru Wolf VormWalde also advocates going with a tire built with a synthetic, not natural, rubber compound.
"Below 7°C, the temperature has noticeable negative effects on rubber compounds that are designed around natural rubber," he said. "The compound becomes harder, less flexible and adjusts less to the ground. A softer natural rubber, carbon-filled compound is preferable to a harder natural rubber compound. The natural rubber compound still hardens more than a comparable synthetic silica compound with a higher glass transition temperature would."
Also think about switching to a wider tire than you'd normally run. This serves the same goal of boosting traction, but in this case by increasing the size of the contact patch.
The ultimate bargain solution, however, is to simply decrease your tire pressure.
