Why is the Aventon Current the only eMTB with IP67 water resistance?

[ktm540al]

Hey, why is aventon current the only emtb with a water resistant rating i.e. IP67

I've got a 2017 giant trance 2.

 

[Greg Watts]

Hey, why is aventon current the only emtb with a water resistant rating i.e. IP67 I've got a 2017 giant trance 2.

The Aventon Current isn't actually the only eMTB with a water resistance rating, though it's one of very few that actively markets it as a headline feature. The Specialized SL 1.2 motor, for instance, also carries an IP67 rating for water and dust resistance.

The reason most eMTB manufacturers don't slap an IP rating on the whole bike is partly practical and partly legal. An IP67 rating means the unit can survive submersion in 1m of water for 30 minutes, which is a specific, testable, certifiable claim. Most major motor manufacturers (Bosch, Shimano, Brose) build their systems to handle rain, mud, puddle crossings and pressure washing without issue, but they deliberately avoid committing to a formal IP rating on the complete bike because there are too many variables: cable routing, frame sealing, display connections, battery contacts. One aftermarket modification or a slightly loose connector and suddenly your "IP67 rated bike" leaks, and you've got a warranty headache.

Aventon can do it because they control the entire system end to end (motor, battery, frame, integration) and they're marketing heavily to commuters and road-crossover riders who see "waterproof" as a purchase driver. Traditional MTB brands don't bother because their customers already assume the bike can handle biblical conditions, and they'd rather not create a legal liability by promising a specific rating.

 

[ktm540al]

The Aventon Current isn't actually the only eMTB with a water resistance rating, though it's one of very few that actively markets it as a headline feature. The Specialized SL 1.2 motor, for instance, also carries an IP67 rating for water and dust resistance.

The reason most eMTB manufacturers don't slap an IP rating on the whole bike is partly practical and partly legal. An IP67 rating means the unit can survive submersion in 1m of water for 30 minutes, which is a specific, testable, certifiable claim. Most major motor manufacturers (Bosch, Shimano, Brose) build their systems to handle rain, mud, puddle crossings and pressure washing without issue, but they deliberately avoid committing to a formal IP rating on the complete bike because there are too many variables: cable routing, frame sealing, display connections, battery contacts. One aftermarket modification or a slightly loose connector and suddenly your "IP67 rated bike" leaks, and you've got a warranty headache.

Aventon can do it because they control the entire system end to end (motor, battery, frame, integration) and they're marketing heavily to commuters and road-crossover riders who see "waterproof" as a purchase driver. Traditional MTB brands don't bother because their customers already assume the bike can handle biblical conditions, and they'd rather not create a legal liability by promising a specific rating.

When reading about emtbs they all seem to say do not power wash. The Brose motor seems to allow water and dirt in very easily. The rebuilders all have seal kits to help keep water and dirt out. This is what has kept me from buying an emtb. Thanks for your input.

 

[Greg Watts]

When reading about emtbs they all seem to say do not power wash. The Brose motor seems to allow water and dirt in very easily. The rebuilders all have seal kits to help keep water and dirt out. This is what has kept me from buying an emtb. Thanks for your input.

@ktm540al Your concern is fair, and the Brose motor specifically does have a well-documented history of water ingress issues. The non-drive side needle bearings seizing due to water entering between the spindle and its housing is a common failure mode on Brose motors.

That said, it's worth knowing that Brose acknowledged their early reliability problems and implemented a major optimisation package in 2021, with further improvements since then that have made the drives more resistant to water ingress.

But here's the broader picture: the Brose is being phased out. If you're buying now in 2026, you're unlikely to end up with one unless you're buying a used Specialized Levo Gen 3 or similar.

Most eMTB mid-drive motors are manufactured to an ingress rating of around IP54, which means they're quite happy being ridden in the rain. The real enemy isn't rain or puddles, it's pressure washers and deep water crossings.

Effective seals add drag which reduces battery efficiency, so manufacturers are often reluctant to sacrifice range for better water resistance, which is partly why formal IP67 ratings are rare on the whole system.

The "do not power wash" warning is standard across the industry but it's also common sense for any bike with bearings. A gentle hose and brush is fine.