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Free UK standard shipping on orders over £50
The Bryton Gardia Seatpost Mount is the replacement seatpost mount for the Bryton Gardia 300L Rear Light & Radar — the same mount included with the Gardia 300L when purchased new, available here as a spare or replacement. It fits 27.2mm, 30.9mm, and 31.6mm seatposts in round, D-shaped, and aero profiles, covering the most common road and gravel bike seatpost sizes and shapes. At just 26g, it adds minimal weight to the rear of the bike.
The mount uses a strap-based attachment system that wraps around the seatpost and secures the Gardia 300L in the correct rearward-facing orientation for effective radar detection and rear visibility. It's the appropriate choice for bikes where the seatpost is accessible and within the listed size range. For bikes where seatpost mounting isn't practical — integrated seatposts, dropper posts, or seatpost-mounted saddle bags — the Bryton Gardia Saddle Rail Mount is the alternative. Browse the full Bryton range or our computers and GPS collection.
Is this the same mount included with the Gardia 300L?
Yes — this is the same seatpost mount included with the Bryton Gardia 300L when purchased new. It's available here as a spare or replacement if the original mount is lost or damaged.
Which seatpost sizes and shapes does it fit?
The mount fits 27.2mm, 30.9mm, and 31.6mm seatposts in round, D-shaped, and aero profiles — covering the most common road and gravel bike seatpost sizes. If your seatpost is outside these sizes or has an unusual profile, the Gardia Saddle Rail Mount may be a better option.
What if my seatpost is integrated or I have a dropper post?
For bikes with integrated seatposts, dropper posts, or where the seatpost position is occupied by a saddle bag, the Bryton Gardia Saddle Rail Mount is the appropriate alternative — it attaches to the saddle rails instead of the seatpost and is compatible with round and oval rail profiles.
Does the mount position the Gardia 300L correctly for radar detection?
Yes — the seatpost mount is designed to position the Gardia 300L in the correct rearward-facing orientation for effective 190-metre radar detection and maximum rear light visibility. Ensure the unit is level and facing directly rearward after installation for optimal performance.
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.


