Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.
TermsPrivacy
Deal.ai › Compare

Universal Bike Trailer Hitch Coupler vs EUNORAU M12 Thru Axle Trailer Hitch Adapter

These are not interchangeable parts. The Universal coupler is a generic steel hitch kit for bikes with quick-release or nutted axles up to 12.2mm, and it comes as two sets so you can leave one on each bike. The EUNORAU M12 is a single thru-axle adapter built for mid-drive e-bikes with 142–148mm or 175–190mm dropouts and a M12x1.5 thread. Buy the Universal for a standard bike or a QR e-bike; buy the EUNORAU only if your frame has a thru axle and you tow an EUNORAU trailer.

  • Choose the Universal Bike Trailer Hitch Coupler if your bike has a quick-release or nutted rear axle up to 12.2mm and you want a spare mount for a second bike.
  • Choose the EUNORAU M12 Thru Axle Adapter if your mid-drive e-bike has a 12mm thru axle with M12x1.5 thread and 142–148mm or 175–190mm dropouts.

Prices

  • Universal Bike Trailer Hitch Coupler: $15.99 at eBay (checked today)
  • EUNORAU M12 Thru Axle Trailer Hitch Adapter: $45.00 at BHive Moto Shop (checked today)
  • Difference: the Universal Bike Trailer Hitch Coupler is $29.01 cheaper than the EUNORAU M12 Thru Axle Trailer Hitch Adapter today
U
Universal Bike Trailer Hitch Coupler Heavy Duty Steel Bicycle Trailer Attachment Connector Replacement, Standard Kit, 2 Long & 2 Short U-Bolts Set

Universal Bike Trailer Hitch Coupler

Universal Bike Trailer Hitch Coupler Heavy Duty Steel Bicycle Trailer Attachment Connector Replacement, Standard Kit, 2 Long & 2 Short U-Bolts Set

$15.99at eBayObserved at 2:35 AM
See all prices and details
Visit eBay

Store links may earn us a commission.

Pros
  • Two sets included, so you can mount it on two bikes
  • Fits QR and nutted axles up to 12.2mm
  • Stainless steel resists corrosion
  • Quick attach and detach of the trailer
Cons
  • Will not fit thru axles
  • Not compatible with Breezer-style dropouts
  • U-bolt clamp is bulkier than a threaded adapter
  • No thread spec, so check your axle diameter first
EUNORAU
EUNORAU M12 Thru Axle Trailer Hitch Adapter for Mid-motor Ebike

EUNORAU M12 Thru Axle Trailer Hitch Adapter

EUNORAU M12 Thru Axle Trailer Hitch Adapter for Mid-motor Ebike

5(2 ratings)
$45.00at BHive Moto ShopObserved at 2:35 AM
See all prices and details
Visit BHive Moto Shop
Pros
  • Proper threaded fit for 12mm thru axles
  • Two dropout widths cover common e-bike frames
  • Steel construction
  • Clean, low-profile mount at the axle
Cons
  • Only fits M12x1.5 thru axles
  • One adapter per order
  • Made for EUNORAU trailers and listed e-bike models
  • No QR or nutted axle support

What separates them

Universal Bike Trailer Hitch CouplerEUNORAU M12 Thru Axle Trailer Hitch Adapter
Axle typeQuick-release and solid nutted axles up to 12.2mm12mm thru axle only
Thread specNo thread spec; clamps to the axle with U-boltsM12x1.5 thread, fixed
Dropout widthNot width-specific; fits most standard framesTwo versions: 142–148mm or 175–190mm
Sets includedTwo complete sets, one per bikeOne adapter per order
Trailer compatibilityUniversal coupler for most trailer brandsBuilt for EUNORAU trailers, mainly the one-wheel cargo trailer
Bike compatibilityMost bikes, MTBs and e-bikes with QR or nutted axles; not Breezer dropoutsMid-drive e-bikes, listed EUNORAU models SPECTER-ST, URUS, SPECTER-S
MaterialStainless steelSteel, black coated
InstallationBolt the U-bolts to the axle and tighten; hitch clips on and offReplace or extend the thru axle with the threaded adapter

Price history

$42.00$4.99
Oct 31Nov 9
  • Universal Bike Trailer Hitch Coupler: lowest $4.99 on Nov 9 at Amazon.
  • EUNORAU M12 Thru Axle Trailer Hitch Adapter: lowest $42.00 on Nov 8 at BKRE; $42.00 on Nov 9.

Prices at every store

Universal Bike Trailer Hitch Coupler

  • eBayNew

    In stock

    $15.99Free shippingObserved at 2:35 AM
    Visit eBay
  • WalmartNew

    In stockSold by Humanate

    $16.45Free shippingObserved at 2:35 AM
    Visit Walmart

Also available at

  • AmazonCheck price at Amazon
  • 22b2.comCheck price at 22b2.com

Store links may earn us a commission.

All 2 stores and price history →

EUNORAU M12 Thru Axle Trailer Hitch Adapter

  • Eunorau-ebike.comNew

    In stock

    $45.00+ $14.99 shippingObserved at 2:35 AM
    Visit Eunorau-ebike.com
  • BKRENew

    In stock

    $42.00+ $25.00 shippingObserved at 2:35 AM
    Visit BKRE
  • Turner MotorbikesNew

    Availability unknown

    $45.00Observed at 2:35 AM
    Visit Turner Motorbikes
  • BHive Moto ShopNew

    Availability unknown

    $45.00Observed at 2:35 AM
    Visit BHive Moto Shop

Also available at

  • EUNORAU E-BIKE USCheck price at EUNORAU E-BIKE US
  • BKRECheck price at BKRE
  • Tampa Home & Garden StoreCheck price at Tampa Home & Garden Store
All 14 stores and price history →

Specs compared

SpecUniversal Bike Trailer Hitch CouplerEUNORAU M12 Thru Axle Trailer Hitch Adapter
MaterialStainless SteelSteel
Axle compatibilityQR and solid axles up to 12.2mm—
Maximum axle size12.2 mm / 0.5 inch—
Sets included2 sets—
Parcel dimensions13 x 10 x 5 cm—
Item weight247.1 g—
Package weight0.18kgs / 0.41lb—
Brand—Eunorau
Axle Length—185mm/233mm
Dropouts—142mm-148mm/175mm-190mm
Thread Pitch—M12*P1.5
Color—Black
Show all 19 specsShow fewer specs
SpecUniversal Bike Trailer Hitch CouplerEUNORAU M12 Thru Axle Trailer Hitch Adapter
Attachment Point—Axle
Mounting Mechanism—Hitch
Frame Material—Steel
Compatible Bike Type—Electric bike
Compatible Trailer Type—Cargo trailer
Compatible Axle Type—Thru-axle
Length—185mm, 233mm

What reviewers say

EUNORAU M12 Thru Axle Trailer Hitch Adapter

Buyers who ordered the correct width describe it as exactly what they wanted and say it fits as expected on a mid-motor e-bike.

What people mention
  • FitPraisedBuyers say it fits as expected when the dropout width matches their bike.
  • Thread pitchMixedIt only works with M12 x 1.5 axles, so other bikes are left out.
  • BuildPraisedThe steel body feels solid for towing a loaded trailer.
  • CompatibilityCriticisedIt is tied to EUNORAU's own trailer hitch and listed models.

Questions and answers

Which one fits my bike?
Check your rear axle. If it has a quick-release lever or nuts and the axle is 12.2mm or less, get the Universal. If the axle slides through the dropouts and threads in, measure the dropout width and thread, then get the matching EUNORAU adapter.
Can I use the Universal coupler on a thru-axle e-bike?
No. It clamps around a QR or nutted axle. A thru-axle bike needs a threaded adapter like the EUNORAU M12.
Will the EUNORAU adapter fit a non-EUNORAU trailer?
It is designed around EUNORAU trailers. The coupler end may not match other brands, so check your trailer's hitch before buying.
Which is more durable?
Both are steel. The Universal's stainless steel resists rust better; the EUNORAU's threaded design puts less stress on the frame because it replaces the axle interface rather than clamping it.
Do I need two adapters for two bikes?
The Universal kit already includes two sets. The EUNORAU adapter is sold singly, so buy one per bike if you switch the trailer between them.
Which is worth stepping up to?
Only step up to the EUNORAU if your bike has a thru axle. For QR and nutted bikes, the Universal covers more bikes and trailers for less fuss.

Ask our shopping agent

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

More comparisons

  • Universal Bike Trailer Hitch Coupler Heavy Duty Steel Bicycle Trailer Attachment Connector Replacement, Standard Kit, 2 Long & 2 Short U-Bolts Set vs Anley Bike Trailer Coupler Hitch Connector Rust Proof Metal Bike Trailer Coupler Bicycle Attachment Adapter
  • Universal Bike Trailer Hitch Coupler Heavy Duty Steel Bicycle Trailer Attachment Connector Replacement, Standard Kit, 2 Long & 2 Short U-Bolts Set vs SWETRACE Bike Trailer Hitch Black Connector for Universal Bicycles and E-Bikes 2Pcs
  • Universal Bike Trailer Hitch Coupler Heavy Duty Steel Bicycle Trailer Attachment Connector Replacement, Standard Kit, 2 Long & 2 Short U-Bolts Set vs EUNORAU M12 to M10 Trailer Hitch Adapter for Hub Motor Ebike
  • Universal Bike Trailer Hitch Coupler Heavy Duty Steel Bicycle Trailer Attachment Connector Replacement, Standard Kit, 2 Long & 2 Short U-Bolts Set vs Jingzan 2-Pack M10 x 1.0 Bicycle Trailer Hitch Adapter for Nutted Solid Axles, 304 Stainless Steel Axle Mount Adapters with Flange Nuts
  • Universal Bike Trailer Hitch Coupler Heavy Duty Steel Bicycle Trailer Attachment Connector Replacement, Standard Kit, 2 Long & 2 Short U-Bolts Set vs EUNORAU M12 Trailer Hitch Adapter for Hub Motor Ebike
  • EUNORAU M12 Thru Axle Trailer Hitch Adapter for Mid-motor Ebike vs Anley Bike Trailer Coupler Hitch Connector Rust Proof Metal Bike Trailer Coupler Bicycle Attachment Adapter
  • EUNORAU M12 Thru Axle Trailer Hitch Adapter for Mid-motor Ebike vs SWETRACE Bike Trailer Hitch Black Connector for Universal Bicycles and E-Bikes 2Pcs

Buying guides that pick them

  • Best e-bike trailer hitch attachments
  • Best cheap e-bike trailer hitches