The difference between this new version, 3.5, and version 3 is that this comes with a higher capacity 12ah battery. This black pearl metallic gloss version of the Stride 500 is an e-bike that promises comfort and a smooth ride for all levels of riders. Combining a superior-strength, high-torque 500-watt direct-drive motor mounted in the rear wheel, which delivers 720 watts at peak, with a high capacity 36-volt, 12-amp hour advanced lithium ion battery (LiFePO4), you are guaranteed to enjoy a long ride around town. This step-through, aluminum rigid frame bike brings new meaning to the term “ease of use.” You will also love the Avid BB7 180mm HS1 Disc brakes for the best in heat shedding, not to mention the SRAM X7 Twist 8-speed shifter and the ultra durable Conti Town & Country 26 x 2.1 tires which are well known for stability and traction. Just give the throttle a half twist to activate the “power-on-demand” propulsion system and reach speeds of up to 20 mph on the Stride 500. The battery delivers up to 50 miles per charge and an effortless ride while offering the option of pedaling for exercise. The comfort is unmatched, with a solid, step-through frame for easy mount and dismount, plus an oversized vented saddle for cushion. This bike is suited for all levels of riding thanks to universal adjusting capabilities.