correct rim size for Skyhawk frame

Hi all, I recently ordered a sky hawk frame, I am super excited. I don't know what wheel size I need though. If someone could give me a link to a wheel set, front and back on ebay or something that would be great. I am looking to have 7 speeds on the back rim, and a disc brake on the front rim. Any advice would be awesome thanks
 
edit: actually probably just want a single speed not a 7, cause I don't want to spend time/ money on a derailer/shifter. I do need it to be a freewheel though, I HATE coaster brakes
 
I run a single freewheel myself- and match the chains as best as I can with half-links- which is not always an exact science and one chain- the motor usually may stretch more than the other and need re-adjusting- I have 22 teeth freewheels and I think the bikes have a 42 and 44 front- an easily pedalling gear!


but I HATE tensioners- the weight, the failure risk, the extra links

On the other hand I have run a derailleur in the past- and it's not a bad gig- simply because a derailleur automatically tensions the pedal chain then- all you have top do is sert the motor chain -

and you can also get now a lightweight 3 speed freewheel on ebay, that's almost as light as a single freewheel, but still gives you some pedalling ranges-
 
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