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What do we reckon went wrong here, squad?
The usual mix of things. A bit of fatigue, a bit of stress corrosion cracking, a generous helping of that's effectively a fucking huge brake for a bicycle at I'm guessing ~40% of the tyre rolling diameter it's equivalent to running a 300mm rotor on a 29er. On a normal solo that's moot because you endo before you can use all the brake, but on a cargo bike with the front wheel much further forward of the centre of gravity, you can brake up to the limit of traction.
What do we reckon went wrong here, squad?
Was just riding along™ and went down a hill, applied the brakes and heard a loud crack.
20" wheel on an urban arrow cargo bike (loaded with 40kg). Wasn't going at a crazy speed at all.
I mean my best guess is that these hubs just aren't rated for this kind of load especially with how the flange seems to have sheared off the rotor side.