CRODER® all new Gearmate series, made of AL7075-T6 aluminum material by full CNC machined are not only solid, but also durable. We find benefits of super compact, especially for 46T/30T and 48T/32T. By using this, cyclists can climb easier. Furthermore, Gearmate series can be directly installed on SHIMANO 4-arm, Standard 5-arm BCD 110mm and SRAM Direct Mount System without changing another cranksets and B.B.. This enables gear ratio to be changed easily and makes climbing cycling a lot more fun.