The Shimano Acera groupset is a popular option for mountain bikes, especially mountain bikes that are being used on-road or for hybrid mountain bikes. They are popular in part for their affordability, easy installation, and easy use as a whole. However, they are not considered high end and can be unreliable at times, especially when used in rough conditions. Made by a well-respected brand in the mountain bike industry, this is most recommended for beginner and more intermediate riders who are looking for overall value but don’t have the money to pay for more expensive or cumbersome groupsets.