uhm about 26 cruiser frame

Yes. Do not run a tire wider than 2.0 (20X2) inches with a frame mounted motor. The motor chain will rub the rear tire in most cases. If you want to run bigger tires, like 20x2.5 or 20x3, use a friction drive motor kit. Deacon built a lot of those.
Motorized bikes need a front brake, IMHO. There are some springer forks with brake posts but most springers do not have them.
One last thing: The pedals may strike the ground with every stroke when using 20" tires on a 26" frame. Use a crankset from a 20inch wheeled bike to fix that.
 
oh thanks sir wheelbender6 il post my build when im finshed with it, still holday here in the philippines so some bike shops are still closed . thank you so much again
 
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