In Europe, super singles became popular when the allowed weight of semitrailer rigs was increased from 38 to 40 tonnes. In this reform the trailer industry replaced two axles with dual wheels, with three axles on wide-base single wheels. The significantly lower axle weight on super singles must be considered when comparing road wear from single versus dual wheels. The majority of super singles sold in Europe have a width of . The standard 385 tires have a legal load limit of . (Note that expensive, specially reinforced 385 tires approved for do exist. Their market share is tiny, except for mounting on the steer axle.)