Purchase notes before purchasing, please confirm the item label information on the upper and lower tubes or frames of your electric bike. If you purchased between 2021 and 2023, or if the model number on the frame label begins with spa e.G., Spa000047, spa000113, spa000211 , or if the model number on the frame label reads m026tgb, mt20, gopina v1, etc. , Please select the spa series frame series. If you purchased after 2024, or if the model number on the frame label begins with amak e.G., Amak00016, amak00020, amak00028 , or if the model number on the frame label reads c26 ul, f26ful, ace01, apsvi11, gwlvi11, etc. , Please select the amak series frame series. E-bike parts for these two frame series are incompatible, so please avoid purchasing the wrong parts.