TRP A12 E.A.S.I. derailleur with Bosch e-bike transmission system

E.A.S.I. A12 Rear Derailleur

€445,00
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Meet this member of the E.A.S.I. A12 drivetrain family, your e-bike rear derailleur built for automatic shifting. ePowered by your Bosch eBike technology, A12’s RollShift keeps you in the right gear while torque reduction protects your drivetrain for longer life. The Silent Clutch prevents chain slap for a quieter ride, and 13T sealed-bearing pulleys add smooth efficiency. With a rugged horizontal parallelogram and 12-speed precision, shifting under load feels natural and reliable. No matter if you let it auto-shift or take control and shift manually, this derailleur will not let you down, or your chain.
  • Releases cage spring tension which facilitates easy wheel removal and maintenance
  • Silent Clutch – prevents unwanted chain slap and noise
  • Horizontal linkage between clutch and B-Knuckle – ePowered by Bosch – Power directly supplied from main Bosch Battery
  • Automatic and manual RollShift while rolling
  • Torque reduction during shifting to increase the life cycle of your shifting components
Close-up of a bicycle with TRP E.A.S.I chain and gear system with a blurred background

Roll Shift

Intuitive gear changes without having to pedal, automatic or manually.
Close-up of an e-mountain bike with EASI A12 group set on a dirt trail

Auto-Downshift

When stopping, eShift automatically shifts to the optimum gear for starting off
Person riding a mountain bike with EASIA12 drivetrain group on a trail with motion blur effect

Care-free

Forget about gear changes and focus entirely on enjoying your ride
TRP EASI A12 drivetrain with Bosh ePower technology for electric automatic shifting on an eBike free standing on a rocky trail

Bosch Integration

Experience optimal system efficiency through complete integration into Bosch’s advanced smart system

Don't Just Take Our Word For It

Media Reviews

TRP EVO 12-speed mechanical mountain bike drivetrain system detail - third alternative to SRAM and Shimano for MTB riders"
"The unapologetically mechanical TRP EVO 12 MTB group shifts sharp, can't be rattled by any terrain, and should come on more bikes." - Bike Rumor
TRP EVO 12-speed drivetrain product photography showcasing precision mechanical shifting technology for cyclists"
"My main takeaway was how quiet the drivetrain seemed; there was little to no chain noise and zero derailleur clunking or banging happening while I was pinballing through the rocks and trees." - Pinkbike
TRP EVO mechanical drivetrain components complete system for mountain bike and trail riding applications"
"The TRP EVO 12 mountain bike drivetrain gives riders everything they need from shifter to crank and cassette." - Singletracks
TRP brake system technical design showcase emphasizing innovation in mountain bike hydraulic brake technology
"The complete EVO 12 drivetrain is a well-manufactured piece of kit that delivers the performance to back up its good looks." - Fanatik Bike