Bosch has unveiled a new motor at Eurobike. The Performance Line PX motor doesn’t replace anything; instead it sits in the range above the current Performance Line motor, which has also been the recipient of some updates.

“As part of the MY26 updates, Bosch’s Cargo Line, Performance Line, and Performance Line Speed motors have been enhanced, delivering more torque, improved performance, and compatibility, with a newly developed battery, extending range and boosting efficiency for both everyday and high-speed riding,” says Bosch.

Those look to be incremental changes, but the big news at Eurobike is there’s a new motor in the lineup. The Performance Line PX is a unit that Bosch says offers, “strong support for adventure tours,” and the numbers back that up: it puts out up to 90Nm torque, has a maximum short-term assist of 700W, and will up your leg power by up to 400%. That’s not quite as much as the 100Nm/750W that the most powerful motor in the line, the Performance line CX, now provides – but it’s not far off. 

“Whether on multi-day adventures with heavy luggage, or on spontaneous discovery tours in nature, we have developed the Performance Line PX specifically for the needs of trekking riders,” said Claus Fleischer, CEO at Bosch eBike Systems, about the new motor.

What are those needs? Well, where the CX motor is all about performance – and isn’t the quietest as a result (although Bosch says the new version is quieter) – the PX motor has been designed to offer near-silent support so you can enjoy the quiet countryside.

Another thing that might be an issue is setting off, especially if you’re on a bike that’s fully loaded for a multi-day tour. To that end the PX motor is also designed to detect start-up situations and provide an extra boost, when required. Hill start assist also kicks in if you’re trying to get a heavy bike going on a slope. And of course there’s walk assist to help you when you’re trundling through town trying to find your hotel.

Bosch PX Motor 1.jpg
Bosch PX Motor 1 (Image Credit: Farrelly Atkinson)

The Performance Line PX motor comes programmed with a range of modes, but it’s also configurable via Bosch’s eBike Flow app, so you can set the motor up for the riding you’re doing. A big tour with full panniers in the mountains? You’ll probably want some higher modes. Cruising through the flatlands at no great pace? You can dial down the assist levels and up the range. If you’re in unfamiliar territory then the eBike Flow app also offers a 3D map display which gives you an elevation graph of what’s upcoming to help you anticipate and adjust your assistance if you need to.

Bosch PX Motor 3.jpg
Bosch PX Motor 3 (Image Credit: Farrelly Atkinson)

Another thing that Bosch has been expanding is its motors’ compatibility with electronic shifting systems. Mid motors are most efficient – and last longer – if they’re run at the best cadence, and Bosch’s eShift allows the drive system to control your gearing so you’re always running at optimal cadence. eShift has been compatible with both Enviolo and TRP systems for a while, but now it will also work with Shimano Di2 systems, which will open up a much wider range of bikes.

We haven’t managed to have a go on the new PX motor yet, except on the test track at Eurobike which is basically round a flat car park, so it’s a bit early to say how it performs, but we expect to see PX-equipped bikes become available over the next few months, so as soon as we can point one at some meaningful terrain we’ll make sure we let you know how it performs.

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