Why does ABS only cover the front wheel?
 

So Bosch is going to release an ABS system for ebikes, but it only works on the front wheel. Why? Don't we also want to prevent the rear wheel from skidding?

Interesting.

Front skidding is rare on dry pavement, but perhaps more common on wet pavement, and far more dangerous than a rear skid.

Would it be smart enough to control a front flip?

Front wheel is more dangerous because of going head over wheels.
"Your safety is enhanced through the combination of front wheel ABS and rear wheel lift control"

@angerdan Thanks for the links.

Glad to see the Bosch thinking is almost exactly what I had predicted. E-Bikes with the typical high speeds likely will benefit from that more than the average bikes... except for high speed road bikes, but those situations are also different.

I understand that front brake lockout leads to more dangerous situation.
I don't understand why they couldn't do both wheels? I mean, when the rear wheel starts to skid, that's also effective loss of braking, you start to slide, especially on ice and such. And when you skid, rear wheel doesn't rise up, it drags along the ground, so rear lift control won't help there.

I mean, I'm happy we have this, at least. But I brake mainly with the rear wheel, so would hope to see something more interesting in this regard.

Also, what a huge box! :)

Since this is the first product for bicycles, you can expect it to become smaller and more functional during development evolution.
Like with the motorcycle ABS.
Bosch?s new motorcycle ABS 10 goes into production with Kawasaki and Suzuki - Bosch Media Service

Necro-post warning:

I just happened to bump into this when looking at another topic, is anyone using this? Has it gone into further development?

I remember seeing that Bosch announcement some time ago but nothing since

Did find this

https://www.outbraker.eu/

With no wheel sensor would have to wonder how it really works. Seems like more of a proportioning valve like used on a car's rear brake than a true skid sensor.

As for why only on the front? I imagine contributors might be expense, weight but primarily because that is where 80% of your braking comes from in a heavy stop.

Guess they did come out with it. Ebikes only, controls both front and rear brakes.

https://www.cnet.com/roadshow/news/b...s-to-bicycles/

A skidding rear wheel isn't particularly dangerous or hard to control -- the bike still balances fine, you can steer it, and typically you'll be coming to a stop soon anyway. I can see why they focused on the front, especially since its main function is not to prevent skids, but endos.

That is part of what's had me curious. As I am sure you noted, the article you linked to is dated 2017. Yet, I have seen no consumer products with it.

This picture shows a sensor wheel:
https://cimg6.ibsrv.net/gimg/bikefor...68ef0db95a.jpg
from here

Physics of deceleration?

The front wheel is the obvious place to stop endos. Be Well, Bluesfrog.

Again, not trying to shill the system, I doubt that Bosch needs shills. However, watch the video, particularly starting at ~:45

They show the system preventing endos.

I had it happen on my e bike doing 30mph down a hill when the strap of my pannier caught between the fender and wheel. was fish tailing like crazy and smelled burned rubber bad. pretty scary but it was controllable.