Bikeberry 4 stroke kit = 23 mph on 29er?

Huasheng 142f 4 stroke kit from BikeBerry. This kit literally runs a 29.29.1 ratio. 7800 rpm = 23 mph on a 29er. Advertised at 25-35 mph.
On a 26" you would only get 20.6mph at 7800 rpm.

Yes this is right... The gearbox has a primary 7t rear 41t. Output primary 10t rear 50t.

I can at least pass the old lady pedaling in the neighborhood.

Bummed I gotta spend more to reach advertised speeds.

Yeah, well rub it in. I actually got to go faster today. I hooked up a tow rope to the old lady pedaling down the street, today she was in a hurry.