2025 Transition

Regulator SX XT

Transition Bikes announce two all-new lightweight eMTBs equipped with Bosch motors.

Read Review

I’d argue that Bosch’s fifth generation CX drive unit is the most significant mountain bike motor of 2025. Not the DJI Avinox with its ludicrous power, but Bosch’s humble 85Nm torque power pack. The German brand’s biggest motor is the dominant force in e-bikes because it’s available right now on a host of new bikes – not just one – and that gives consumers real choice, and at scale too. Instead of picking a motor and then being forced into just two models of the same bike (no matter how good you think the Amflow PL Carbon might be), Bosch Gen 5 lets you pick between many, and to suit your riding style. We’re talking about the Santa Cruz Vala, Trek Rail+, Cube Stereo Hybrid One44, Focus Jam2 and so on. And the newest bike of all, Transition’s Regulator CX here. – Short of time? Click here to skip to the verdict – A great motor doesn’t immediately transform the Regulator into one of the best electric mountain bikes on the market though, so keep reading to hear why I don’t think it’s the bike for me. Transition Regulator CX need to know All new e-bike from Transition, with 150mm travel, 160mm fork and mullet wheels Powered by Bosch CX Gen 5 motor, and a 600Wh non-removable battery Full carbon frame with four sizes, two chainstay lengths, new cable routing and chainstay protection XT build comes with Shimano XT drivetrain, 150mm SRAM cranks, OneUp finishing kit Premo RockShox Zeb Ultimate and new for 2025 Super Deluxe shock XT bike costs £8,499 Check out range details of the Transition Regulator CX and the less powerful SX bike in my Transition Regulator news story The Regulator is Transition’s third e-bike, and the US brand’s fourth motor, meaning it’s very sensibly not wedded to any particular power unit, preferring to use whatever’s the most important for the application. The big-hitting Repeater with 170mm travel started out using Shimano EP8 before working as a launch partner for SRAM’s Powertrain. And the Transition Relay lightweight e-bike, which I absolutely love to ride by the way, used Fazua’s Ride 60. The new Regulator CX gets less travel than both those bikes, at 150mm, with a 160mm fork up front, a mixed wheel setup and a 600Wh battery. There are two models in the range, this XT and a Deore spec, and the pricing is actually pretty sensible compared to the Santa Cruz Vala, with the Transitions at £8,499 for the XT and £6,999 for the Deore bike. There’s one more thing to know before we get started on the review – the Regulator also comes as an SX build, meaning it gets Bosch’s lighter, smaller and less torquey motor. It also has some implications for the way Transition’s built the bikes, and how they ride, which I’ll get to later. Frame and geometry The Regulator’s full carbon frame is much slimmer and better looking than the bulky Repeater. This is in part down to the motor …Continue reading »

Read Review

We tested the new Transition Regulator.

Read Review