Radio communicationSRAM GX AXS electric drivetrain in endurance test

Henri Lesewitz

 · 15.12.2021

Radio communication: SRAM GX AXS electric drivetrain in endurance testPhoto: Robert Niedring
Radio communication: SRAM GX AXS electric drivetrain in endurance test

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When Sram unveiled the radio-controlled GX AXS rear derailleur at the start of 2021, you could hear the death knell ringing for the good old Bowden cable.

The price was still relatively high. But the ride tests left no doubt that the AXS technology works perfectly. If higher unit numbers continue to drive prices down, will we soon only have wireless shifting on mountain bikes? Who knows? Our endurance test at least answers the question of the reliability of the Sram GX Eagle AXS electric drivetrain. When we set off on our first tours with the electric GX in May, the excitement was great. Although the Premium version XX1 AXS had already proven to be amazingly resistant the year before - including the battery. The GX version was virtually identical in construction, but was made of much cheaper materials. Did this mean that the electronics were less well protected against moisture? Would the bearings of the pulley wheels be susceptible to corrosion? And was the workmanship commensurate with the price, which seems favourable in relation to the XX1, compared to the mechanical GX gearstick but is almost twice as high?

  The GX AXS changes gears as quickly and precisely as the expensive XX1 version. Below: The button cell in the controller lasted the whole season.Photo: Robert Niedring The GX AXS changes gears as quickly and precisely as the expensive XX1 version. Below: The button cell in the controller lasted the whole season.

To find out, we didn't spare the gears. We didn't shy away from mud battles or riding in the rain. The constant ups and downs of Munich's Isar trails were a constant challenge for the gears, while on Alpine tours the gears were changed under full load. The GX AXS coped with all this without complaint. It manoeuvred the chain over the sprocket set without a single hitch. The battery proved to be long-lasting. It lasted up to six weeks between charges. The button cell of the controller: still original. We didn't really warm to the trough-shaped gear lever. The classically shaped, retrofittable rocker paddle (19 euros) we like much better. And the wear? The derailleur pulleys: still smooth-running. The cage: rattle-free. The springs: firm. In contrast to the crumbly GX chain, the rear derailleur hardly shows the effects of the season. Find out how the GX Eagle chain and cassette compare to more expensive Sram groupsets and Shimano drivetrains here in our Drivetrain wear test of 1x12 groupsets.

Whether radio or Bowden cable will dominate in the future is therefore less a question of reliability and more a question of price. And whether bikers can make friends with battery management.

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Sram GX AXS

Weight: 521 gram

Price620 Euro (rear derailleur, controller, battery) >> e.g. available here

PLUS Good workmanship; precise shifting; tidy appearance; shifting character adjustable via app; stepless downshifting

MINUS High price; battery management required; expensive replacement battery (49 euros); original rocker switch takes some getting used to

Functionality 5 out of 6 points

Durability 6 out of 6 points

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