The bike came with some stock 1.75s. I got 2.125s.
I havent seen a freewheel crank in forever, guess they finally found a practical use....
2.125's will be fine. Odd your bike didn't come with them, all mine have.
The Pantera is a bit tight but they come out nice direct drive.
Not great off the line with only 49cc but it's easy to give it a little pedal boost to get going.
Yes, freewheel cranks are the key to a shifter and do indeed have great use now.
Gears change everything, especially for a little engine.
Here are some tips should you find you wish you had gears for your engine power in the future...
Actually it is really just freewheeling sprockets, not pedal cranks.
The sprocket pair is not directly fixed to the pedal crank shaft, they attach to a bearing and that attaches to the crank shaft so the sprockets will spin free on their own in one direction.
I use the Sick Bike Parts bottom bracket parts, their ~$80 HD freewheel bearing holds up well.
Their jackshaft base mount is nice too, much better than the stock kits, just not as good as mine ;-}
Give me gears, or give me a chauffer ;-}