In this video I upgrade the standard brake calipers on my Mercane WideWheel Pro to XTech Zoom (HB100) calipers.
Buy the XTech Zoom from Amazon here:
https://www.amazon.com/dp/B07RSH5GDN?ref=p...
A worthy upgrade for the WideWheel the rear brake now has much more braking force and requires less adjustment, less often.