Darrvin E-bikes can be ordered in two basic frame sizes: Medium or Large. Adjusting the handlebar and saddle positions on the frame allows for the bikes to be downsized or upsized i.e XS, S, from Medium, XL or XXL from Large. If you are a size XS, S or Medium, then order the Medium frame on check-out. Conversely, if you are XXL or XL, then order the Large frame option upon check-out. We will confirm prior to delivery your correct size directly with you once we receive the purchase order and set your bike frame appropriately for your size.