winter snow riding on mountine bike. extreme weather, slippery road in field, close view

adhesion adhesiveness below bicycle bike biking cold cool country cross cycle drive endurance enduro extreme felloe felly field fit forest freeride freeze frost hill icy landscape low mark melting mtb nature path pattern races reflection riding rim slippery slope snow snowdrift snowflake sport spring springtime temperature test time tire track trail training tread trip tyre water way weather wheel winter wintertime zero