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The Robert Axle Project Kid Trailer Thru Axle is designed for Surly MDS or Gnot Boost bikes with 12x142 or 12x148 hub spacing. It allows for the secure attachment of hitch-mounted trailers, offering superior strength and easy 5mm hex installation.
The Robert Axle Project Kid Trailer Thru Axle is designed for Surly MDS or Gnot Boost bikes with 12x142 or 12x148 hub spacing. It allows for the secure attachment of hitch-mounted trailers, offering superior strength and easy 5mm hex installation.
Robert Axle Project

Robert Axle Project KID218 Thru Axle for Kid Trailers 151/157mm

£65.00
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So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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Items must be returned in their original packaging and unused. Refunds will be issued once the product(s) have been received and inspected.

Click & Collect customers can buy with confidence knowing that they can review the item before deciding whether it is right for you before leaving the store. Should you decide it's not right for you, it can be conveniently exchanged or refunded straight away, or you still have up to 90 days to return it if you are still unsure.

Please note:
1. If the items we have sent you are faulty, damaged or not as we described, we will cover the cost of collection and the delivery of the correct item.

2. If we have delivered the correct bike but upon inspection, you decide the bike is not the one for you, we will charge you £50 for collection (£100 from Northern Ireland). If you do not have the original box in usable condition, we will charge you an additional £15 to provide one.

Refunds will be processed using the same method of payment used for the original purchase. Credit & debit card refunds must be made to the card used for the original purchase.

We are unable to offer a refund without a valid proof of purchase.

Robert Axle Project KID218 Thru Axle for Kid Trailers 151/157mm

Season:All Year Round

Brand:Robert Axle Project

Code:TRRBK218

The Robert Axle Project Kid Trailer Thru Axle is designed specifically to fit 12mm thru-axle bikes and allow the attachment of any hitch-mounted trailer. This axle is tailored for Surly MDS or Gnot Boost bikes with 12x142 or 12x148 hub spacing.

It fits any two-wheeled child, pet, or cargo trailer that uses a single point of attachment, including brands such as Thule, Chariot, Burley, Instep, and Carry Freedom. The derailleur end is internally threaded and utilises the bolt from your stock Surly axle, while the disc brake side features a permanently attached mount with an external M10x1 thread.

These axles are engineered to be 3 to 4 times stronger than stock axles, providing a secure attachment point. Machined to tight industry standards, they are designed to handle the high-torque loads generated by e-bikes and are safety tested to failure to ensure they exceed expectations.

Key Features & Benefits:

  • Compatibility: Specifically designed for Surly MDS or Gnot Boost bikes with 12x142 or 12x148 hub spacing.
  • Robust Construction: Machined from 7075 aluminium with a stainless steel end, offering 3 to 4 times the strength of stock axles.
  • Easy Installation: Quick to install or remove using a standard 5mm hex key, with no special tools required.

Full Specification:

  • Compatibility: Fits 142/148 hub standard Surly MDS or Gnot Boost bikes
  • Derailleur end: Internally threaded; uses the bolt from your stock Surly axle
  • Disc brake side: Has an engineered mount for your trailer hitch, permanently attached
  • Trailer compatibility: Burley, Carry Freedom, Chariot/Thule, Croozer, Instep, and many more
  • Axle shaft material: 7075 aluminium, hard black anodised
  • Axle end material: Stainless steel
  • Hitch thread specification: M10x1 (metric)
  • Included hardware: Hardware for attachment of the hitch is included; the hitch is not
  • Installation tool requirement: No special tools required; installation or wheel removal uses standard 5mm hex wrench
  • Manufacturing origin: Designed, built and quality tested in the USA
  • Weight: 0.14kg


If you are unsure which axle you need click here to use the axle finder (opens in new window)

The code provided by the axle finder will differ from the code on the Balfe's website, use the table below to find the Balfe's equivalent code:

Robert Axle ProjectBalfe's Site Code
LIG506.NHURBFL506N
LIG509.FHURBFL509F
LIG510.FHURBFL510F
LIG526.NHURBFL516N
LIG519.CHURBFL519C
LIG505HURBFL505
LIG506HURBFL506
LIG510HURBFL510
LIG511HURBFL511
LIG512HURBFL512
LIG519HURBFL519
LIG523HURBFL523
LIG528HURBFL528
LIG529HURBFL529
LIG502HURBFL502
LIG504HURBFL504
LIG508HURBFL508
LIG509HURBFL509
LIG514HURBFL514
LIG516HURBFL516
LIG517HURBFL517
LIG501HURBFL501
LIG503HURBFL503
LIG507HURBFL507
LIG513HURBFL513
LIG515HURBFL515
LIG521HURBFL521
LIG522HURBFL522
LIG527HURBFL527
LIG603.NHURBRL603N
LIG604.FHURBRL604F
LIG613.NHURBRL613N
LIG614.FHURBRL614F
LIG601HURBRL601
LIG603HURBRL603
LIG604HURBRL604
LIG606HURBRL606
LIG607HURBRL607
LIG608HURBRL608
LIG609HURBRL609
LIG610HURBRL610
LIG611HURBRL611
LIG613HURBRL613
LIG614HURBRL614
LIG615HURBRL615
LIG617HURBRL617
LIG621HURBRL621
LIG623HURBRL623
LIG626HURBRL626
LIG627HURBRL627
LIG628HURBRL628
LIG629HURBRL629
LIG634HURBRL634
LIG635HURBRL635
LIG637HURBRL637
LIG634HURBRL639
DDA201TBRBD201
DDA202TBRBD202
TRA201TBRBT201
TRA202TBRBT202
TRA204TBRBT204
TRA210TBRBT210
TRA211TBRBT211
TRA212TBRBT212
TRA213TBRBT213
TRA214TBRBT214
TRA217TBRBT217
TRA221TBRBT221
TRA222TBRBT222
TRA223TBRBT223
TRA225TBRBT225
TRA226TBRBT226
BOB110TRRBB110
BOB111TRRBB111
BOB112TRRBB112
BOB113TRRBB113
BOB114TRRBB114
BOB117TRRBB117
BOB121TRRBB121
BOB122TRRBB122
BOB126TRRBB126
BOB106TRRBB106
BOB107TRRBB107
BOB108TRRBB108
BOB109TRRBB109
BOB115TRRBB115
FOL110TRRBF110
FOL111TRRBF111
FOL112TRRBF112
FOL113TRRBF113
FOL114TRRBF114
FOL117TRRBF117
FOL121TRRBF121
FOL122TRRBF122
FOL126TRRBF126
KID206TRRBK206
KID207TRRBK207
KID208TRRBK208
KID209TRRBK209
KID215TRRBK215
KID210TRRBK210
KID211TRRBK211
KID212TRRBK212
KID213TRRBK213
KID214TRRBK214
KID217TRRBK217
KID221TRRBK221
KID222TRRBK222
KID223TRRBK223
KID225TRRBK225
KID226TRRBK226
UDH001FMRBUH001
LIG504.FHURBFL504F
LIG518HURBFL518
PLU100HURBPL100
LIG623.CHURBRL623C
LIG624HURBRL624
TRA213.NTBRBT213N
TRA214.FTBRBT214F
TRA218TBRBT218
TRA223.CTBRBT223C
TRA224TBRBT224
ADA001TRRBA001
ADA005TRRBA005
ADA006TRRBA006
ADA007TRRBA007
ADA008TRRBA008
ADA009TRRBA009
ADA010TRRBA010
ADA125TRRBA125
ADA126TRRBA126
ADA127TRRBA127
BIN001TRRBB001
BIN002TRRBB002
BOB113.NTRRBB113N
BOB114.FTRRBB114F
FOL114.fTRRBF114F
KID204.YTRRBK204Y
KID213.NTRRBK213N
KID214.FTRRBK214F
KID218TRRBK218
KID219TRRBK219
KID220TRRBK220
KID223.CTRRBK223C
KID224TRRBK224
KID633.OTRRBK633O
Sizing Information
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