Ok I have 3 Bikes at the moment. 1. a 26" Mongoose Mountain bike 2. A 27" Next or Walmart Special Mountain Bike and 3. A 26" Royce Union 12 Speed Mountain bike... Now bikes one and 2 have suspension which has me concerned that there is not enough clearance for a motor..now the Royce Union is actually an older bike but it has no suspension and even has the curved forks and not the solid tubes used in a lot of mountain bikes today. SO my question is...which bike would be the best choice to use as a new/first build? Just typing this I actually know but always glad to hear extra opinions that will help me as the project begins.