Steel E-bike frame designed for 26 inch beach cruiser bike Suitable for 26"x3.0/4.0 Tire Rear Hub: Spacing 175mm Bottom Brackets: 40mm*100mm. Head Tube: 38mmx34mmx140mm. TRACER&';s stretch cruiser Steel E-bike frame, suitable for every cycling enthusiast, DIY a favorite bike and improve the hands-on skills! Be sure to look at the dimensions of the Stretch Cruiser E-bike Steel Frame, and if you have any questions or concerns, please feel free to contact us and we&';ll get back to you within 12 hours!