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Free UK Shipping Over £50 & Easy Returns



Free UK standard shipping on orders over £50
The Shimano Deore XT RD-M8100 XT 12-speed rear derailleur is engineered for mountain bikers who demand precision and reliability on every trail. Featuring the innovative Shadow+ SGS single design, this derailleur provides a super low profile and optimized slant angle for smooth, lightweight shifting action. Its advanced chain stabilizing switch minimizes chain bounce on rough terrain, ensuring a quieter, more stable ride even in the most challenging conditions.
Built with durability in mind, the derailleur boasts cold forged wide alloy links, a pivot body, and four fluorine-coated link pin bushings that reduce friction for seamless performance. The direct cable routing prevents snagging during intense rides, while the rubber bumper on the pulley cage further enhances silent operation. Designed specifically for 12-speed 1x drivetrains, it supports a max low sprocket of 51T and features a 41T capacity SGS cage, making it ideal for aggressive trail riding.
Whether you’re ascending steep climbs or navigating technical descents, the Shimano Deore XT RD-M8100 delivers reliable shifting with a strong return spring and durable sealed 13T bearing pulleys. Its single tension spring keeps the mechanism from contacting the chainstay, reducing noise and wear for a smoother overall experience.
Is this derailleur compatible with all Shimano drivetrains?
The Shimano Deore XT RD-M8100 is specifically designed for 12-speed 1x drivetrains and may not be compatible with other configurations.
How does the Shadow+ technology benefit riding performance?
Shadow+ includes a chain stabilizing switch that reduces chain bounce, providing a quieter and more stable ride, especially on rough terrain.
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.
