Eunorau M12 Thru Axle Hitch Adapter Review

The M12 Thru Axle Trailer Hitch Adapter is a steel mounting part priced at $52.99 that, according to the page, lets a trailer attach to the thru axle of a mid-drive e-bike. The page lists an M12*P1.5 thread pitch, axle lengths of 185mm/233mm and a black finish, and tells buyers to select the adapter by dropout width. It names the Eunorau ONE-Wheel trailer as a match.

Specifications

Options and pricing

The page offers two variants at the same $52.99, split by dropouts: 142mm-148mm or 175mm-190mm. Both were in stock when the page was read, and no crossed-out price is shown. SPECTER-ST and URUS are named for 142mm-148mm, and SPECTER-S for 175mm-190mm. The page does not list the hardware that comes in the box.

How it compares

The Eunorau 190mm Hub Quick Release Skewer for E-Bike Trailers costs $29 and its spec line names the Eunorau Cargo Trailer - ONE Wheel, while this $52.99 adapter's own page names the ONE-Wheel trailer too. Neither this page nor the skewer's spec line says the two parts are used together.

Shipping, returns and warranty

Shipping: the shipping page says accessories and batteries go by FedEx or UPS in an estimated 5 to 9 days after 1 to 3 business days of processing; orders over $100 ship free and smaller orders pay $14.99, with a possible remote-area charge. If the local warehouse is out of stock, the item ships from an overseas warehouse in an estimated 10 to 15 business days, and there may be no carrier tracking until it reaches the destination country and clears customs. Returns: an order can be cancelled for a full refund before it ships or is produced, but not after it ships; the page asks buyers not to refuse a delivered e-bike and to contact the store instead. A return must be applied for within 7 calendar days of receipt, the product must be new and re-sellable (not assembled, ridden, used or damaged) and complete with its manuals, accessories and original packaging, and the buyer ships it back within 7 days at their own cost to Eunorau's warehouses in the US, Australia, Europe or the UK. The store inspects it within 5 days and refunds in full when the fault is Eunorau's (wrong, damaged or defective item) or minus the shipping cost when the reason is the customer's. The terms page says customers are charged shipping only once, returns included, with no restocking fee, which does not match the return page's wording. Warranty: the warranty page covers original Eunorau parts and components for 24 months (manufacturing defects only, no labor) but excludes wear items, free gifts and accessories that came with a purchase, and damage from unapproved accessories or chargers; it does not name this item, so ask support whether and how it applies. It is for the original purchaser and excludes shipping damage. Disputes under the warranty go to binding individual arbitration (AAA rules, Nevada law) unless the buyer emails an opt-out within 30 days of purchase.

Before you buy

The page shows 2 customer reviews with 100% of them five-star in the store's own widget, which we could not verify; several product pages show the same review counts or lists, so the figure may not belong to this item alone. Reputation: Eunorau E-Mobility USA Corp has an F grade on the Better Business Bureau, is not BBB accredited and has 2 complaints on file, both marked unanswered: a December 2025 request for proof that a bike sold as new was new, and a May 2025 report of a battery cover that would not latch, which the buyer attributes to a frame defect. A web search on 21 October 2026 found no Trustpilot page for Eunorau. The store says it has specialised in e-bikes since 2009 and designs its bikes in the US and manufactures them in Shanghai, while the BBB lists a business start date of 12 December 2019; the eunorau-ebike.com domain was registered on 27 July 2016.