This is an Easy Step by Step Assembly of Costco Echelon Connect EX 4S. How to assemble your echelon connect bike ex 3 ex 4 ex 5 ex 7. This video will guide you thru the assembly process of the echelon connect ex4s sold at costco and instructions can also be used to assemble the echelon ex 3 ex 4 ex 5 ex 7.Echelon Connect EX 4 4S Easy Step by Step Assembly of Costco spin bike