2021 newest design, mid drive model, with 27.5*2.5 inch tires. Front hydraulic fork and rear air shock, make the riding more comfortable and adapt to rugged roads such as mountains. Bafang ultra electric bike with full hidden battery, strong and stable source of power. But due to the fast speed and strong power, we recommend that you pay more attention to the surrounding environment and try not to travel in rain, snow and windy weather. Detail Specification Bafang Ultra Electric Bike Electrical system Mechanical system Battery 48V 14AH lithium battery(Samsung optional)Frame 6061 Aluminum alloy Motor 48V750W/1000W Bafang G510/M620 mid drive motorBrake Tektro E350 / LOGAN HD E500 Hydraulic Disc Brakes with power cut-off Display Bafang DP C18 color displayFreewheel AMFTZ5007428 Shimano 7 speed Controller 48V 25-28A, inside the motorShifter ASLTX50R7CT Shimano 7 speed Light LED Front and rear lightDerailleur ARD-FT35AD Shimano 7 speed Pedal assist 12 magnetsFender/ rack Including Throttle Thumb/Twist throttleTire 26" x 2.5 Kenda/Chaoyang Brand Cable Waterproof and quick connectFront axle Quick Release Charger Smart charger, AC110V-240V/50-60HZ (Different country plug optional)Fork RST / MOZO suspension front fork Others Grip/ SaddleVelo / Chifan Black or BrownKickstand Aluminum alloy Handle /stemAluminum alloyChainKMC Stainless Steel PedalWellgo Aluminum alloyCrank setProwheel 48T Charging time 5-7 hoursDistance/charge35-55 KM Max Speed 25-42 KM per hourPacking size 160*30*80 CM N.W. 28 KGSG.W.35 KGS Since the battery is completely inside the frame, the battery can only achieve a maximum of 14Ah. Since the Bafang ultra mid drive motor is very powerful and consumes a lot of power, we recommend that you try to use assisted riding to ensure riding range. In addition, we recommend that you manage the riding distance to avoid running out of power and causing troubles. Wish you will have a happy trip. Q&A 1: Q: What鈥檚 the max speed? A: With Bafang 1000W M620/G510 motor, the max speed can get up to 50km/h, but we don鈥檛 suggest you ride so fast, better no more than 42km/h. 2: Q: What鈥檚 the max battery? A: This model鈥檚 max battery is 14Ah, if you want larger battery, we can introduce some other models to you. 3: Q: Can I adjust the configuration? A: Yes, please tell us your idea, we will try our best to help. 4: Q: What is your warranty? A: One year warranty after sell.Wholesale Electric Bicycle website:http://www.passionebikes.com/electric-bicycle/