I converted this ultra step-thru Biria for my wife, figuring she would appreciate the EZ-on/EZ-off . Used a Q128 rear motor. 20A KT controller. LCD3 display. I even adjusted the seat in the horrible position she likes.

The Biria runs its shifter and brake cable thru the frame, so I ran the 4n1KT harness thru too. The controller box was too awkward to fit between downtube and fender. I put it on the luggage rack. If I find something a little thinner, maybe I'll move it, It will show less cabling behind the seat tube then.
While the bike can pull 1000 watts briefly.I thought the alloy frame dropouts were strong enough to not need torque arms. Throttles are legal here, so it got one.

I kept the original brake levers, which were better than your typical Wuxing brake levers with switches. Fitted magnets and switches to the original levers.
Decided not to use a downtube battery .Main reason is the battery cables would be exposed and run several feet to the controller. I am loath to drill any access holes in alloy frames. So it will be a battery bag on the rear rack. I'll run a 48V 26 cell 21700 pack in there. Should be good for 40 miles easily,
Bike is smooth. Runs nice. PAS 1 is 130 watts and allows easy pedalling at 12-14 mph. PAS 2 is about 220 watts. Haven't run it any higher. Have installed a better mirror and a handlebar bag, not shown,
WHat's the trouble. Easy pedalling isn't good enough. She is used to the "effortless pedalling" from her mid drive TSDZ2B on this beater Giant frame. The TSDZ2B has OSF firmware set in cadence mode. I rode it yesterday and I have to agree that it's much easier to pedal the Giant. It's also shorter and handles quicker.
We'll see what happens. I don't mind riding it.


The Biria runs its shifter and brake cable thru the frame, so I ran the 4n1KT harness thru too. The controller box was too awkward to fit between downtube and fender. I put it on the luggage rack. If I find something a little thinner, maybe I'll move it, It will show less cabling behind the seat tube then.
While the bike can pull 1000 watts briefly.I thought the alloy frame dropouts were strong enough to not need torque arms. Throttles are legal here, so it got one.



I kept the original brake levers, which were better than your typical Wuxing brake levers with switches. Fitted magnets and switches to the original levers.
Decided not to use a downtube battery .Main reason is the battery cables would be exposed and run several feet to the controller. I am loath to drill any access holes in alloy frames. So it will be a battery bag on the rear rack. I'll run a 48V 26 cell 21700 pack in there. Should be good for 40 miles easily,
Bike is smooth. Runs nice. PAS 1 is 130 watts and allows easy pedalling at 12-14 mph. PAS 2 is about 220 watts. Haven't run it any higher. Have installed a better mirror and a handlebar bag, not shown,
WHat's the trouble. Easy pedalling isn't good enough. She is used to the "effortless pedalling" from her mid drive TSDZ2B on this beater Giant frame. The TSDZ2B has OSF firmware set in cadence mode. I rode it yesterday and I have to agree that it's much easier to pedal the Giant. It's also shorter and handles quicker.
We'll see what happens. I don't mind riding it.
