it's also likely mildly more dangerous than a standard ebike, as ebikes typically overprovision their brakes. A customer putting this on a standard bike (especially a disc brake bike) might have less stopping power than they want on an ebike.
replyWhy “especially a disc brake bike”? They’re the most reliable and resilient system so far, especially compared to rim brakes (V-brakes or cantilevers).
replyThe requirement for better brakes is more a myth. Yes an e-bike is heavier but the rider + bike pair is not significantly heavier so e-bikes don't really need better brakes as most of them aren't going significantly faster than regular "muscular bikes", especially the legal ones that have an assistance speed limit. Rider weight makes a much bigger difference yet bike brands don't insist on speccing more powerful brakes on bigger riders.
replyAs an experienced mountain biker I’d love if the downvoters could engage with the comment. I agree with it. A proper legal e-bike, especially when clamped to 25 km/h or a similar limit, doesn’t really need that much stopping power than a comparable regular bike. Maybe the sum of all the factors (often less experienced riders, slightly more speed in some situations, slightly higher weight) warrants going to a bigger rotor diameter or a different brake pads compound, which is how it’s usually done. But it’s still nothing compared to speccing cargo bike brakes or tandem brakes, there you really have to account for the weight and go all the way to like 200mm rotors and four-pot calipers.
replyI wouldn't worry about it in this application, because the added weight and power is so minimal. Also: many of the cheap ebikes ($1000-1500 range) have absolutely terrible, underprovisioned brakes.
replyonly real worry I'd have is a scenario like
reply1. someone has a cheap disc brake bike for pleasure rides (mostly in the sun)
2. they get something like this for commuting or whatever
3. now they're on their disc brake bike most days (including when it rains), going faster than they're used to
it's not the end of the world, but it also doesn't seem great