RUJOI Bike Disc Brake Caliper, Aluminum Mechanical Front and Rear Caliper for Road Bike, Mountain Bike

I just installed these calipers on an old Marin MTB. They work really well, and they look nice. These aren't fancy hydraulics. They don't have any bells or whistles. But why would you want your disc brakes making noise anyway?

Better built that the factory brakes that came on the e-bike

Used these to replace 15 year old calipers that came on the bike. These work great, and were a breeze to install.

God

Missing spare pads as described. Would rate higher if not missing from my purchase.

I've had to buy MANY of these over the past year or so because they WEAR DOWN FAST. And when I say fast I mean if they're not already useless when you first install them, they're likely to have worn down significantly after your first ride if it's, say, an 8 mile ride. After going through several of these over the last couple of months, it seems that they're only good for about a week if you ride your bike at least 5 days a week, and you're lucky if you get 2 weeks of use out of them. After so many tries (purchases), I've come to the conclusion that this brand/company/model is just no good. I will not be purchasing anymore of these disk brakes.

very bad breaks dangerous you wont stop on a big ebike

Those brakes are not hydraulic. This item is 100% mechanical and it doesn't have a drop oil in the brake cylinder. I am very disappointed when I see something like this on Amazon.