The RAD cage is a replacement outer cage for Shimano GS (medium cage) clutch rear derailleurs, that dramatically improves shifting performance of any extended range Shimano 10x drivetrain. RAD Design The key feature of the OneUp RAD (Radial Appositioned Derailleur) cage is that we’ve moved the upper pulley wheel rearward of the cage pivot to optimize the derailleur for larger sprockets. Now as the derailleur moves into larger sprockets the top pulley wheel automatically moves away to adjust the chain gap, no longer relying on just B-Screw. The RAD cage is a 1x10 11-40/42 specific product only for Med cage derailleurs . Long cage (SGS) derailleurs are only needed for 2x drivetrains. Shorter derailleurs are preferred for 1x10 systems as they’re lower profile so less vulnerable to damage on the trail and they allow you to run a shorter chain which improves chain retention. RAD Benefits ~ Dramatically improves shifting performance for Shimano GS (medium cage) Shadow+ clutch rear derailleurs ~ Chain Wrap (cassette wear) and Free Chain Length (shift performance) corrected to stock Shimano spec - See chart ~ Tuning your derailleur to achieve perfect shifting with an 11-42 is now much easier ~ Requires Stock B-Screw adjustment (No more removing washers or reversing B-Screws) ~ Improves chain wrap and extends cassette life ~ Installs in under 15 minutes – checkout the install video for full details SPEC Material: 7075-T6 Aluminum Weight: 26g Colour: Black, Green Compatibility: Shimano GS (medium cage) Shadow+ 10spd clutch rear derailleurs - Deore (RD-M615 GS) - SLX (RD-M675 GS) - XT (RD-M786 GS) - XTR (RD-M985/RD-M986 GS) Patent pending SGS models of the derailleurs above as well as Saint (RD-M820) and Zee (RD-M640) can be converted to use a RAD cage. This requires the purchase of a GS inner plate from one of several online retailers or your local shop. The part numbers are - Y5XC09000 (XTR), Y5XC09100 (XT, SLX) or Y50H09000 (Deore). NOTE: Any of the three part numbers above are functionally interchangeable. There may however be material or small aesthetic differences. NOTE: Saint (RD-M820) and Zee (RD-M640) use the XT spring mounting hole on the RAD cage. Please visit our website at http://www.ecomtb.com.my OR https://shopee.com.my/eco_mtb ** There is 1-3cm errors due to manual measurement. Please kindly understand. ** Actual product colour may slightly vary due to photographic lighting sources or your monitor settings. ** WE DO NOT DO COD ** ONLINE ONLY ** We support original products only. ** PRICE INDICATED IS ALREADY BEST PRICE, EXCLUDE COURIER