When most people decide to make an electric bike, they usually don't consider the type of frame they use.They often use the old bike they lie down on, or go to Wal-Mart to buy a cheap bike.It's good if you're building a low-power electric bike, but if you want something faster and more powerful than a normal electric bike, you need to choose the bike frame carefully.The fork affects the way the bike handle from the angle or angle of the head extended from the frame.The steeper the angle of the head (close to 90 degrees), the bike will travel at high speed, or more unstable.At high speed, the lazy buff (close to 0 degrees) will be more stable, but will lose some stability when the slow sharp turn.A relaxed head angle also extends the wheelbase of the bike, which further increases the heightspeed handling.According to the intended use of the bike, the head angle of the freeride or downhill mountain bike frame will vary from 64 to 69 degrees, so these are excellent platforms for high-speed electric bicycles.Bike manufacturers will list this information under frame geometry on their website (with the goal of 66 to 68 degrees) so you can find out the head angle of any bike frame by checking it onlineCraigslist is a great place to buy used mountain bikes that are perfect for your electric bike conversion and can save you more money and better spend on high quality battery packs.You can buy a full suspension frame that will give you a good smooth ride if you don't need a remote bike (rear suspension takes up space and you can add more thereIf you want to get the maximum range from the bike, the large size hard tailstock (no rear suspension) is your best choice as there is enough space inside the frame to install the large capacity battery pack