Call Us: 01782 747782
Free UK Shipping Over £50 & Easy Returns


Free UK standard shipping on orders over £50
Experience the pinnacle of road cycling technology with the Shimano Ultegra ST-R8170 bled hydraulic disc and Di2 E-tube STI set. Designed for serious cyclists, this left-hand rear component combines cutting-edge wireless shifting with powerful hydraulic braking, delivering seamless control and precision on every ride. The flat mount caliper ensures a sleek, aerodynamic fit, while the advanced Servo Wave technology provides exceptional stopping power with minimal effort, enhancing your confidence from hood position to hard braking moments.
Built for efficiency and customization, the Ultegra Di2 shifting system offers effortless gear changes with just a light touch. Its fully and semi-synchronized shifting options allow you to tailor your riding experience, enabling one shifter to control both front and rear derailleurs perfectly. The tactile buttons are ergonomically placed for intuitive use, even in cold weather, maintaining comfort during long rides. This kit comes complete with bled ST-R8170 STI levers, BR-R8170 flat mount brake calipers, pads, hoses, and mineral oil, making it ready to install and perform right away.
With finely tuneable reach adjusters, the levers adapt to fit any hand size, ensuring optimal ergonomics and control. The hydraulic reservoir auto-adjusts pad to rotor clearance, maintaining consistent braking power as pads wear. Powered by long-lasting CR1632 batteries, this Di2 system promises reliability and a maintenance-free experience for up to two years. Whether you're climbing steep hills or sprinting on flat roads, this Shimano Ultegra component set delivers the precision and stopping power you need to perform at your best.
Is this STI set compatible with my current Shimano Ultegra Di2 drivetrain?
Yes, the ST-R8170 set is designed specifically for Shimano Ultegra Di2 12-speed systems and will integrate seamlessly with other R8100-series components.
Does the kit include brake rotors and adapters?
No, this kit includes the bled STI levers, brake calipers, pads, hoses, and mineral oil but does not come with rotors or brake adapters, which must be purchased separately.
Stock Status Instock - Instore - Item Usually shipped or available for shop collection, within 48 hours (Mon-Fri)
Instock - Supplier Warehouse - Item is held in Suppliers Warehouse, Depending on the the supplier transfer time can vary from 24 Hours to 14 Days for item held in European warehouse.
(over festive periods some suppliers shut from 24th Dec-2nd Jan so orders can be delayed through this period.)
Brands held in European website include Trek, Bontrager, Electra, Wahoo, Rapha. For up-to-date transfer times please call customer services on +44 (0)1782 768622
Most out products are shipped by FedEx, providing unprecedented reliability and speed. Lightweight Spares below £25.00 value have a Royal Mail postage option, which is sent via Tracked 48 service. - £2.99
Shipping on all Domestic Orders over £50.00 (excluding bikes and home trainers) for delivery within the UK is completely FREE!
Bike and Home Trainers and oversize Goods £15.00 - FedEx
White Glove Bike Delivery - our white glove option has your bike personally delivered to you by a fully trained Mechanic and Bike fitter - £99.99
(Certain bikes will only have this option such as Cargo Bikes)
To Qualify for FREE Shipping:
In some cases, we may ship items out with another courier, depending on the status and availability of items ordered. (Customers will not be charged more and will be refunded any unused postage cost) If part of an order is cancelled and the total drops below the £50.00 free postage, a postage charge may be taken.
Delivery costs will be clearly stated on the checkout page, though you will need to register (to provide your delivery address) in order to see the delivery costs.
If you have any questions about delivery charges, times or none delivery please do not hesitate to get in touch by email:store@swinnertoncycles.co.uk or by telephone on +44 (0)1782 768622. Handling is normally 48 hours, but at busy periods this may be extended but we will endeavor to process your order within 5 working days. Please bear in mind in some cases orders can take longer to process, please contact us for more details.
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.