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The Topeak Fixer Set for DeFender M1 is the replacement mounting hardware for the Topeak DeFender M1 front mudguard — the bracket and fixer components that clamp the mudguard to the fork's steer tube or crown. The DeFender M1 mounts directly to the fork steer tube without requiring mudguard eyelets, making it compatible with road and gravel bikes that lack traditional mudguard mounts. The fixer set covers two steer tube diameter ranges: 19.6–26mm and 27.7–35mm, accommodating standard 1-inch threaded, 1¼-inch, and standard 1³⁄₁₆-inch ahead forks across both ranges. This is the correct spare if the original fixer has been lost, damaged, or broken.
A genuine Topeak spare part, ensuring correct fit and clamping force for the DeFender M1. Installation uses the same process as the original — the fixer clamps around the steer tube and the mudguard body clips into the fixer bracket. No tools required for the mudguard attachment itself; the fixer bracket requires a screwdriver or hex key to tighten the clamp around the steer tube. Compatible with the DeFender M1 only — not compatible with other Topeak DeFender models (M2, iGlow, etc.) which use different fixer designs. Browse our full mudguards collection for the complete DeFender range and other mudguard options.
How do I know if this fits my fork?
Measure the outer diameter of your fork's steer tube — the tube that passes through the head tube and into the stem. Standard 1³⁄₁₆-inch ahead forks (the most common modern standard) have a steer tube outer diameter of approximately 28.6mm, which falls within the 27.7–35mm range. Older 1-inch threaded forks measure approximately 22.2mm outer diameter, within the 19.6–26mm range. If unsure, measure with calipers before ordering.
Is this compatible with the DeFender M2 or other Topeak mudguards?
No — this fixer set is specific to the DeFender M1. The DeFender M2, iGlow, and other Topeak mudguard models use different fixer designs that are not interchangeable. Check your mudguard model before ordering.
What tools are needed for installation?
The fixer bracket clamps around the steer tube using a small bolt that requires a screwdriver or 3mm hex key to tighten. The mudguard body itself clips into the fixer without tools. Tighten the clamp bolt firmly but do not overtighten — the bracket is plastic and can crack if over-torqued.
Can I use the DeFender M1 on a bike with mudguard eyelets?
Yes — the DeFender M1 mounts to the steer tube regardless of whether the bike has mudguard eyelets. The steer tube mount is independent of the eyelet mounts. However, if your bike has eyelets and you want full-length mudguard coverage, a traditional eyelet-mounted mudguard will provide better coverage than the DeFender M1's minimalist design.
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.




