užitočné linky

skid patches – https://www.purecycles.com/blogs/bicycle-news/9547445-skid-patches-and-saving-tires
http://www.bikecalc.com/skid_patch_calculator
http://www.bikecalc.com/skid_patch_math
životnosť reťaze – http://www.sheldonbrown.com/chain-life.html