Introduction In the year of 2015 we designed and developed the RM27, RM30, AM35 and AM40 series of carbon fiber mountain rims. These four mountain rims incorporate aerodynamic design concepts, which are beautiful in appearance and extremely strong. While, because of its unique rounded design, it is difficult to reduce the weight. Nonetheless, they have remained a user favorite mountain rims over the years and have become a classic mountain rim range of NEXTIE's. The RM series and AM series have become the proud products of NEXTIE. They are the starting point for our progressive development and production of lighter and stronger carbon fiber mountain bike rims The weight of model NXT29AM40 is 475g. The profile drawing of this rim is as below. This rim could be used for AM (All Mountain), Trail and Enduro riding. The tire size for this model of rim is recommended at 2.2" ~ 3.0". The tire pressure is recommended at 30 ~ 60 psi.