Why buy your bike from Sigma Sports?
Don't hesitate to reach out to us. It's our goal to answer all of your questions and offer the best advice from our experts. We’ll be happy to answer any questions you may have. Contact us now or visit us in-store.
All our bikes are fully built by our Cytech qualified mechanics. To find out more, see the Built, Checked, Tuned and Tested section below to see how we'll deliver your bike.
We offer FREE DELIVERY of your bike to your home or place of work. Once you've placed your order, our Customer Care team will be in contact to offer a convenient delivery date of your choice.
Cyclescheme can save you up to 39% on a bike and accessories. Visit our Cycle to Work Scheme page to learn more and claim.
Optima E50 Electric Hybrid Bike 2021
With ease of use at the forefront of its design, the Optima E50 Electric Hybrid Bike is a contemporary model developed to enhance your city and town travel. The Ebikemotion X35 Plus motor and battery are an all-new breed of lightweight system, designed to retain the look and feel of a traditional, non-electric bike. Powerful enough to assist on hills and propel you through the streets, yet light enough to provide responsive handling and be stored in an apartment - the Optima range combines the best of both worlds to be the ideal choice for a fast pace of life.
Fully integrated into the downtube, the 248Wh battery is slim and lightweight, ensuring the Optima can be easily wheeled into the office. The X35 motor delivers its power with a natural, controlled feel, and lets you arrive at your destination sweat-free. The handlebar-mounted iWoc TRIO remote allows you to select your assistance level without removing your hands from the bar, perfect for mixed-gradient rides and has a sleek, unobtrusive design.
Durable and low maintenance, the Shimano Acera 8-speed drivetrain is an ideal pairing to the X35 motor system, and the Shimano mechanical disc brakes provide sufficient power, even in damp conditions. The wide Kenda tyres are fast-rolling and grippy, and the Selle Royal Milo Plus saddle is comfortable for long journeys. SKS EDGE Alloy mudguards come pre-fitted to combat road spray, and a pannier rack adds versatility for commuting or shopping. Integrated into the battery, the built-in lights promote visibility for riding in low-light conditions.
Highlights
- Features mudguards, a pannier rack, and a stand as standard
- Integrated lighting, front and rear
- Lightweight internal Ebikemotion 248Wh battery
- Ebikemotion X35 motor system
- Minimalist and integrated design to mimic the look of a non-electric bike
- Near drag-free pedalling when the motor is not in use
- Discreet iWOC TRIO handlebar remote
- 8-speed Shimano Acera groupset for smooth shifting
- Mechanical Shimano TX805 disc brakes
- Comfortable Selle Royal Milo Plus saddle
- Swept-back bars for an upright seating position
Battery Specifications
- Maximum Assist: 250w / 40Nm torque
- Motor Weight: 2.1kg
- Battery Power: 248wh
Technical Specification
| Frame | Orbea Optima Hydroformed Alloy, comfortable city geometry |
| Fork | Orbea Optima 400mm Alloy Post mount |
| Headset | VP-Z104PD 1-1/8" Semi-Cartridge |
| Stem | Orbea TDS-D617 |
| Handlebar | Orbea City Riser alloy, 640mm width |
| Front Brake | Shimano TX805, mechanical disc |
| Rear Brake | Shimano TX805, mechanical disc |
| Brake Levers | Shimano TX805 |
| Rear Derailleur | Shimano Acera M360, 8-speed |
| Shift Levers | Shimano SL-M315, 8-speed |
| Chain | KMC X8 |
| Cassette | SunRace CSM66 11-34t, 8-speed |
| Crankset | Prowheel PRA105, 42t, with Sunon A017 chainguard |
| Front Wheel | Ready GR, 700c |
| Rear Wheel | Ready GR, 700c |
| Front Tyre | Kenda 1172, 700x50C, clincher |
| Rear Tyre | Kenda 1172, 700x50C, clincher |
| Saddle | Selle Royal Milo Plus DR |
| Seatpost | Orbea alloy 31.6mm |
| Pedals | Available to be purchased separately |
| Motor | Ebikemotion X35 Plus 25kmh |
| Ui/Remote | Ebikemotion iWoc TRIO |
| Battery | Ebikemotion 36V/6.9A 248Wh ANT+ |
| Accessories | Joss Spanninga Kendo Steps front light, Joss Spanninga Lineo XDS Dinamo rear light, Ursus Power single adjust central bike stand, SKS EDGE Alloy C56R mudguards, Orbea Optima rear luggage carrier |
Built, Checked, Tuned and Tested
All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if specified), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.
All bikes collected from our shop, are built, tested and ready to ride.
Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. We do not install accessories to bikes, including mudguards.