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Thru axle adapter from Robert Axle Project for attaching bike trailers, with axle, spacer and hitch mount.

Thru Axle Adapter for Bike Trailer – Robert Axle Project (Special Fit)

Special Fit: Designed by Robert Axle Project for unique axle needs.
Covers the Rest: Our universal adapters fit 95% of thru axle bikes.
Exact Fit: Ideal for uncommon specs or special thread types.
Trailer Compatible: Fits Nordic Cab, Thule, Hamax, Burley & more.
Top Quality: Made in the USA by the trusted Robert Axle Project.

$99 – $129

Taxes and duties are included in price.

Axle model

Clear

SKU: N/A Categories: Bike Trailer Hitch Adapter, Norwegian Hiking Brands, equipment and bike trailer / ski pulk accessories

Description

Thru Axle Adapter for Bike Trailer – Robert Axle Project (Special Fit)

This is a series of special-fit thru axle adapters designed for bikes with 12 mm thru axles where standard universal adapters won’t fit.

Choose the correct version from the dropdown menu above, based on thread pitch, axle length, and thread engagement.

🔧 Note: These adapters are only for bikes with unique or uncommon axle specifications.
For 95% of all bikes with 12 mm thru axles, we recommend our universal thru axle adapters instead.

👉 Browse Universal Thru Axle Adapters →

🤔 Not sure which adapter you need?

No worries – we’ll help you figure it out in under a minute.
📩 Just fill out our quick help form, and we’ll get back to you the same day or next business day.

About Robert Axle Project x Nordic Cab

Since 2016, Nordic Cab has partnered with The Robert Axle Project, a US-based brand known worldwide for producing the highest quality thru axles for bikes.

🔧 Focused on One Thing – and Best at It
Robert Axle Project only makes thru axles – and they do it exceptionally well. Their axles are precision-engineered, tested, and proudly made in the USA.

✔️ When you buy one of these adapters, you’re getting a genuine Robert Axle Project axle, selected by Nordic Cab to match your bike.
✔️ Our partnership means we can offer custom-fit solutions even for rare bikes and non-standard setups.

We’re proud to be the official distributor of Robert Axle Project in Scandinavia.

Additional information

Weight	100 g
Dimensions	24 × 7 × 2 cm
Axle model	FL 1650, FL 1720, FL 1780, FL 1800, FL 1830, HAR 013, KID 204.Y, KID 206, KID 207, KID 208, KID 209, KID 210, KID 211, KID 212, KID 213, KID 213.N, KID 214, KID 214.F, KID 215, KID 216, KID 217, KID 218, KID 219, KID 220, KID 221, KID 222, KID 223, KID 223.C, KID 224, KID 225, KID 226, KID 633.0, RAP 006, RAP 007, RAP 008, RAP 010, RAP 015, RAP 016, TRA 214.F
CountryOrigin	US
Tarif	87149990

Find the Right Adapter

👇 Need help? We make it easy

Many people find it confusing to know which adapter they need – and we totally get it.
But don’t worry – we’ve made it simple. Let us help you!
🎯 Fill out our short help form here – it takes less than 1 minute. We’ll get back to you the same day or by the next business day at the latest.
Can’t find our reply? Check your spam or promotions folder.

Want to find the right adapter yourself?

Use our Bike Trailer Adapter Guide
We’ll show you how to measure your axle and choose the correct model – step by step.

You can also try the Robert Axle Project’s Axle Finder:
🔗 Robert Axle Finder →

Specifications

Thread Pitch	Length*	Fitment Notes	Model ID
1.0 mm	214 eller 229 mm	No specific bike compatibility Includes spacer	KID 215
1.0 mm	Brand Specific	For sykler som har For bikes with NAILD thru axle system and 12×148 Boost spacing	KID 213.N
1.25 mm	180 mm	For selected Orbea mountain bikes	KID 225
1.5 mm	182 eller 188 mm	No specific bike compatibility Includes spacere	KID 222
1.5 mm	209 mm	No specific	KID 206
1.5 mm	229 mm	No specific	KID 208
1.5 mm	166 eller 172 mm	166 with Conical spacer	KID 204.Y
1.5 mm	Brand Specific	Orbea	KID 633.O
1.75 mm	167 mm	No specific	KID 221
1.75 mm	170 mm	No specific	KID 223
1.75 mm	192 or 198 mm	No specific	KID 210
1.75 mm	209 mm	No specific	KID 209
1.75 mm	217 eller 229 mm	No specific	KID 207
1.75 mm	170 mm	For Cervélo bikes with R.A.T axle – includes R.A.T. end piece	KID 223.C
Specific	Specific	For FOCUS R.A.T system – 12×142/148 Boost – includes R.A.T. nut	KID 214.F
Internal thread	Specific	For Surly MDS or Gnot Boost – 142/148 hub standard	KID 218
Internal thread	Specific	For Surly MDS – replaces 12×197 mm – “Ice Cream Truck”	KID 220
Internal thread	Specific	For Surly MDS – replaces 12×177 mm – “Wednesday”	KID 219
Internal thread	165 mm	Only for bikes with Mavic Speed Release system	KID 224

⚠️ Important!

The axle length is not the same as the hub width.
A thru axle must be longer than the hub in order to fit properly in the bike frame.

Dimensions like 12×142 / 12×177 / 12×197 mm refer to the hub width, not the actual axle length. These numbers are often printed on the hub or axle, and may lead to confusion.

Note: Axle length refers to the shaft that slides through the frame and hub.
All axles in this series can be used within ±2 mm of the listed measurements.

Thread Pitch	Length*	Fitment Notes	Model ID
1.0 mm	214 eller 229 mm	No specific bike compatibility Includes spacer	KID 215
1.0 mm	Brand Specific	For sykler som har For bikes with NAILD thru axle system and 12×148 Boost spacing	KID 213.N
1.25 mm	180 mm	For selected Orbea mountain bikes	KID 225
1.5 mm	182 eller 188 mm	No specific bike compatibility Includes spacere	KID 222
1.5 mm	209 mm	No specific	KID 206
1.5 mm	229 mm	No specific	KID 208
1.5 mm	166 eller 172 mm	166 with Conical spacer	KID 204.Y
1.5 mm	Brand Specific	Orbea	KID 633.O
1.75 mm	167 mm	No specific	KID 221
1.75 mm	170 mm	No specific	KID 223
1.75 mm	192 or 198 mm	No specific	KID 210
1.75 mm	209 mm	No specific	KID 209
1.75 mm	217 eller 229 mm	No specific	KID 207
1.75 mm	170 mm	For Cervélo bikes with R.A.T axle – includes R.A.T. end piece	KID 223.C
Specific	Specific	For FOCUS R.A.T system – 12×142/148 Boost – includes R.A.T. nut	KID 214.F
Internal thread	Specific	For Surly MDS or Gnot Boost – 142/148 hub standard	KID 218
Internal thread	Specific	For Surly MDS – replaces 12×197 mm – “Ice Cream Truck”	KID 220
Internal thread	Specific	For Surly MDS – replaces 12×177 mm – “Wednesday”	KID 219
Internal thread	165 mm	Only for bikes with Mavic Speed Release system	KID 224

⚠️ Important!

The axle length is not the same as the hub width.
A thru axle must be longer than the hub in order to fit properly in the bike frame.

Dimensions like 12×142 / 12×177 / 12×197 mm refer to the hub width, not the actual axle length. These numbers are often printed on the hub or axle, and may lead to confusion.

Note: Axle length refers to the shaft that slides through the frame and hub.
All axles in this series can be used within ±2 mm of the listed measurements.

Thread Pitch	Length*	Fitment Notes	Model ID
1.0 mm	214 eller 229 mm	No specific bike compatibility Includes spacer	KID 215
1.0 mm	Brand Specific	For sykler som har For bikes with NAILD thru axle system and 12×148 Boost spacing	KID 213.N
1.25 mm	180 mm	For selected Orbea mountain bikes	KID 225
1.5 mm	182 eller 188 mm	No specific bike compatibility Includes spacere	KID 222
1.5 mm	209 mm	No specific	KID 206
1.5 mm	229 mm	No specific	KID 208
1.5 mm	166 eller 172 mm	166 with Conical spacer	KID 204.Y
1.5 mm	Brand Specific	Orbea	KID 633.O
1.75 mm	167 mm	No specific	KID 221
1.75 mm	170 mm	No specific	KID 223
1.75 mm	192 or 198 mm	No specific	KID 210
1.75 mm	209 mm	No specific	KID 209
1.75 mm	217 eller 229 mm	No specific	KID 207
1.75 mm	170 mm	For Cervélo bikes with R.A.T axle – includes R.A.T. end piece	KID 223.C
Specific	Specific	For FOCUS R.A.T system – 12×142/148 Boost – includes R.A.T. nut	KID 214.F
Internal thread	Specific	For Surly MDS or Gnot Boost – 142/148 hub standard	KID 218
Internal thread	Specific	For Surly MDS – replaces 12×197 mm – “Ice Cream Truck”	KID 220
Internal thread	Specific	For Surly MDS – replaces 12×177 mm – “Wednesday”	KID 219
Internal thread	165 mm	Only for bikes with Mavic Speed Release system	KID 224

⚠️ Important!

The axle length is not the same as the hub width.
A thru axle must be longer than the hub in order to fit properly in the bike frame.

Dimensions like 12×142 / 12×177 / 12×197 mm refer to the hub width, not the actual axle length. These numbers are often printed on the hub or axle, and may lead to confusion.

Note: Axle length refers to the shaft that slides through the frame and hub.
All axles in this series can be used within ±2 mm of the listed measurements.

Metric Measurements

Thread Pitch	Length*	Fitment Notes	Model ID
1.0 mm	214 eller 229 mm	No specific bike compatibility Includes spacer	KID 215
1.0 mm	Brand Specific	For sykler som har For bikes with NAILD thru axle system and 12×148 Boost spacing	KID 213.N
1.25 mm	180 mm	For selected Orbea mountain bikes	KID 225
1.5 mm	182 eller 188 mm	No specific bike compatibility Includes spacere	KID 222
1.5 mm	209 mm	No specific	KID 206
1.5 mm	229 mm	No specific	KID 208
1.5 mm	166 eller 172 mm	166 with Conical spacer	KID 204.Y
1.5 mm	Brand Specific	Orbea	KID 633.O
1.75 mm	167 mm	No specific	KID 221
1.75 mm	170 mm	No specific	KID 223
1.75 mm	192 or 198 mm	No specific	KID 210
1.75 mm	209 mm	No specific	KID 209
1.75 mm	217 eller 229 mm	No specific	KID 207
1.75 mm	170 mm	For Cervélo bikes with R.A.T axle – includes R.A.T. end piece	KID 223.C
Specific	Specific	For FOCUS R.A.T system – 12×142/148 Boost – includes R.A.T. nut	KID 214.F
Internal thread	Specific	For Surly MDS or Gnot Boost – 142/148 hub standard	KID 218
Internal thread	Specific	For Surly MDS – replaces 12×197 mm – “Ice Cream Truck”	KID 220
Internal thread	Specific	For Surly MDS – replaces 12×177 mm – “Wednesday”	KID 219
Internal thread	165 mm	Only for bikes with Mavic Speed Release system	KID 224

⚠️ Important!

The axle length is not the same as the hub width.
A thru axle must be longer than the hub in order to fit properly in the bike frame.

Dimensions like 12×142 / 12×177 / 12×197 mm refer to the hub width, not the actual axle length. These numbers are often printed on the hub or axle, and may lead to confusion.

Note: Axle length refers to the shaft that slides through the frame and hub.
All axles in this series can be used within ±2 mm of the listed measurements.

Material: High-quality CNC-machined aluminum or stainless steel
Thread pitch (TP): Multiple variants available
- x1.0
- x1.25
- x1.5
- 1.75
Diameter: 12 mm
- Imperial: 0.47 inches
Length: See list below
Made in USA

Metric Measurements

Thread Pitch	Length*	Fitment Notes	Model ID
1.0 mm	214 eller 229 mm	No specific bike compatibility Includes spacer	KID 215
1.0 mm	Brand Specific	For sykler som har For bikes with NAILD thru axle system and 12×148 Boost spacing	KID 213.N
1.25 mm	180 mm	For selected Orbea mountain bikes	KID 225
1.5 mm	182 eller 188 mm	No specific bike compatibility Includes spacere	KID 222
1.5 mm	209 mm	No specific	KID 206
1.5 mm	229 mm	No specific	KID 208
1.5 mm	166 eller 172 mm	166 with Conical spacer	KID 204.Y
1.5 mm	Brand Specific	Orbea	KID 633.O
1.75 mm	167 mm	No specific	KID 221
1.75 mm	170 mm	No specific	KID 223
1.75 mm	192 or 198 mm	No specific	KID 210
1.75 mm	209 mm	No specific	KID 209
1.75 mm	217 eller 229 mm	No specific	KID 207
1.75 mm	170 mm	For Cervélo bikes with R.A.T axle – includes R.A.T. end piece	KID 223.C
Specific	Specific	For FOCUS R.A.T system – 12×142/148 Boost – includes R.A.T. nut	KID 214.F
Internal thread	Specific	For Surly MDS or Gnot Boost – 142/148 hub standard	KID 218
Internal thread	Specific	For Surly MDS – replaces 12×197 mm – “Ice Cream Truck”	KID 220
Internal thread	Specific	For Surly MDS – replaces 12×177 mm – “Wednesday”	KID 219
Internal thread	165 mm	Only for bikes with Mavic Speed Release system	KID 224

⚠️ Important!

The axle length is not the same as the hub width.
A thru axle must be longer than the hub in order to fit properly in the bike frame.

Dimensions like 12×142 / 12×177 / 12×197 mm refer to the hub width, not the actual axle length. These numbers are often printed on the hub or axle, and may lead to confusion.

Note: Axle length refers to the shaft that slides through the frame and hub.
All axles in this series can be used within ±2 mm of the listed measurements.

FAQ

FAQ – Frequently Asked Questions

I don’t know which variant to choose – what should I do?

Just fill out our help form – we’ll help you fast.

What if I buy the wrong one?

No problem – if you’re unsure, contact us first. We’ll help you get it right. (Free exchange inside Norway.)

Can I install it myself?

Yes! It’s super simple. You only need a hex key or wrench.

Will it fit my trailer?

Yes – it fits all bike trailers that mount on the rear hub (2-wheel trailers, not single-wheel cargo).

Does it come with spacers?

Some – many variants come with removable spacers to adjust length.

What is a thru axle?

It’s a solid axle that goes through your frame and wheel hub – common on modern MTBs, e-bikes and gravel bikes.

How do I measure my thru axle?

Remove the axle and check for printed specs. You’ll see something like “M12x1.5 – 172 mm”. Or use our guide.

Can I use it with a quick release bike?

No – this is only for thru axle bikes. For quick release, check our 5 mm adapter.

What’s the thread pitch?

It depends on your bike. Common are M12x1.0, M12x1.5 or M12x1.75 – let us help you check.

Is it safe for children/pets in the trailer?

Absolutely. All our adapters are tested and safe for towing kids and dogs.

Do I need a torque wrench?

Not necessary – hand-tight and secure with a wrench is usually enough. Check manufacturer guidelines for torque specs.

Can I use this on multiple bikes?

Only if they have the exact same axle specs. Otherwise, you need one per bike.

Does this work on electric bikes?

Yes – most e-bikes use thru axles. Just check the specs.

What if my axle has no visible markings?

Use our contact form here and we will help you find the correct adapter for your bike.

Where is it made?

They are made in the US by the Robert Axle Project.

Can I use this with a hooded dropout?

Yes – our design works perfectly even on hooded dropouts.

Do you ship worldwide?

Yes! We use DHL Express for fast, tracked global shipping. Your local tax and VAT is included in the price you see here. No surprises. Delivery varies between 2-6 days depending on your location.

How long is delivery in Norway?

Usually 1–3 business days.

Do you sell solid axle or QR adapters?

Yes – check out our full adapter collection.

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Accessories/Parts

Thru Axle Adapter for Bike Trailer – Robert Axle Project (Special Fit)

Description