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Free UK Shipping Over £50 & Easy Returns



Free UK standard shipping on orders over £50
The BOX BMX Box One Chain Tensioner combines precision engineering with sleek design to enhance your BMX setup. Crafted from extruded and CNC-machined 7075-T6 aluminum, it offers an exceptional balance of strength and lightweight performance. The anodized finish with laser-etched graphics not only adds visual appeal but also provides practical wheel position guides, making adjustments intuitive and accurate.
Designed for compatibility with 10mm axles, this chain tensioner features two mounting holes offering 15mm of adjustment, ensuring a perfect fit for most BMX frames. Its dual-colour XO skeleton design block and dual-sided grid provide reliable tension control, helping to protect your frame dropouts and maintain rear wheel stability during rides. Ideal for riders who value both functionality and style, the Box One is a smart upgrade for your brake and component needs.
Explore the full range of BOX BMX components and consider pairing the Box One Chain Tensioner with other brake spares to keep your BMX performing at its best. Available in two striking colours, it’s easy to match your bike’s aesthetics while benefiting from top-tier durability and adjustability.
Will this tensioner fit my BMX frame?
The Box One Chain Tensioner is designed to fit most BMX frames with a 10mm axle and features 15mm of adjustment to ensure compatibility.
How does the adjustment system work?
It uses two 10mm mounting holes with 15mm of lateral movement, allowing you to fine-tune wheel position for optimal chain tension and alignment.
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.
