One Up Components’ original 42T adapter sprocket signaled the beginning of the wide range 1×10 drivetrain movement, allowing riders to achieve close to the same gearing as a 1×11 set up, at a fraction of the cost. Now they’ve taken things a step further, with the introduction of a replacement outer cage for Shimano derailleurs that’s designed to help improve the shifting performance over the whole cassette.The press release from OneUp Components about the Rad Cage is found below. – Mike Kazimer 

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. Combined with our 40/42T and 16T adapter sprockets it is the complete, no compromise Shimano 1X10 solution.

OneUp Components RAD Cage

RAD Benefits 

– Dramatically improves shifting performance for Shimano derailleurs*
– Tuning your derailleur to achieve perfect shifting with an 11-42 is now much easier
– Requires stock B-Screw length and adjustment (No more removing washers or reversing B-Screws)
– Improves chain wrap and extends cassette life
– Installs in under 15 minutes – check out the install video for full details

*Compatible with all Shimano GS (medium cage) Shadow+ clutch rear derailleurs

Typically stock Shimano derailleurs don’t perform as well as Sram offerings when paired with wide range 11-42 cassettes. This is due to derailleur architecture. The extra B-screw needed to clear the 42T means the upper pulley is further from the cogs in the lower end of the cassette. Shifting therefore can be slower and less responsive here. 

OneUp Components RAD Cage

RAD Design
The key feature of the OneUp RAD (Radial Appositioned Derailleur) cage is that the upper pulley wheel has been moved rearward of the cage pivot to optimize the derailleur for larger sprockets. 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 B-Screw tension needed for an 11-40 or 11-42 cassette with RAD cage is about the same as is required when using a stock Shimano derailleur and 11-36.

Additionally the top pulley now sits above the cage pivot closer to the cassette, when in the lower end of the cassette (11T,13T,16T) resulting in much crisper shifting and more chain wrap.

OneUp Components RAD Cage

Price: $35 USD (shipping July 1st – order now at Includes taxes and duties in the US and EU. Shipping is free worldwide for all orders of $70 or more.
Material: 7075-T6 Aluminum
Weight: 26g
Colour: Black
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)

OneUp Components – Work less ride more.

cycledude (868 Posts)