Product Description No thru-axle like any other: the Kid Trailer Axle by the Robert Axle Project The Robert Axle for bicycle trailers replaces your original thru-axle, so you can attach a child, pet or luggage trailer to your bike with 12 mm over locknut dimension. Kid trailer axles from the Robert Axle Project are compatible with all hitch trailers that have two wheels and a single connection point, e.g. from Thule or Burley. Robert axles are three to four times stronger than standard axles and are therefore suitable for e-bikes as well as racing bikes, mountain bikes or fat bikes. They are manufactured by enthusiastic cyclists in accordance with the strictest industry standards. Rigorous testing procedures ensure that they exceed user expectations. The Robert Axle Project is run by the ultimate thru-axle experts. With their help you will find the right thru-axle - for your trailer, your roller trainer or as a light tuning part for your MTB or road bike. To find out which thru-axle you need, you must first find out the dimensions of your current thru-axle. Often the length and the thread pitch are noted on the axle itself. If not, print this template from the Robert Axle Project (in original size, do not scale) to determine the relevant data. You can also use the configuration from the Robert Axle Project, which will help you find the correct axle using parameters such as bike brand and over locknut dimension. Specifications:Over Locknut Dimension:rear: 142 mm, 148 mmAxle Diameter:12 mmTechnical Information:Use:rear: 12 x 142 mm, 12 x 148 mmType:thru-axleAxle Material:aluminium (7075)Trailer Mount Material:stainless steelFeatures:shank and axle ends CNC precision machinedanodised black shaft for durabilityaxle end for mounting trailer hitches with M10 x 1 metric threadno special tools required, installation and wheel removal with 5 mm hexagon socketfor trailers from Thule/Chariot, Burley, Instep, Croozer, Carry Freedom and many other manufacturersdesigned, built and quality-tested in the USA (Bend, Oregon), used worldwideModels:Type 1: Thread Pitch:1.0 mmAxle Length:229 mm; 217 mm with spacerUse:bicycle trailerManufacturer Number:KID215 Type 2: Thread Pitch:1.0 mmAxle Length:172 mm; 160, 167 mm with spacersUse:bicycle trailerCompatibility:Cannondale, Norco, Felt, Cube, Canyon, Scott, Liteville, LapierreManufacturer Number:KID213 Type 3: Thread Pitch:1.5 mmAxle Length:178 mm; 172 mm with spacerUse:bicycle trailerCompatibility:Merida, Centurion, BMC, Bianchi, Giant, Rocky Mountain, Merlin, Yeti, Marin, PivotManufacturer Number:KID214 Type 4: Thread Pitch:1.75 mmAxle Length:180 mm; 174 mm with spacerUse:bicycle trailerCompatibility:Trek & Salsa Hardtails (full suspension w/o Split-Pivot), Orbea Hardtails, Niner, Ibis, GT, Kona, KTM, Turner, JamisManufacturer Number:KID211 Type 5: Thread Pitch:1.75 mmAxle Length:198 mm; 192 mm with spacerUse:bicycle trailerCompatibility:Trek, Devinci, Orbea & Salsa full suspension w/ Split-Pivot, not for hardtailsManufacturer Number:KID210 Type 7: Use:bicycle trailerCompatibility:FOCUS R.A.T. w/ 12 x 148 mm Boost over locknut dimensionsNote:comes with M12 x 1.5 nut, which replaces the original R.A.T. nut on the rear derailleur sideManufacturer Number:KID214.F Type 8: Thread Pitch:1.75 mmAxle Length:167 mmUse:bicycle trailerManufacturer Number:KID221 Type 10: Use:bicycle trailerCompatibility:NAILD thru-axle systems w/ 12 x 142 mm over locknut dimensionsNote:comes with M12 x 1.0 nut, which replaces the original NAILD nutManufacturer Number:KID217.N Type 11: Thread Pitch:1.5 mmAxle Length:188 mm; 182 mm with spacerUse:bicycle trailerManufacturer Number:KID222 Type 12: Thread Pitch:1.0 mmAxle Length:167 mm; 154 mm, 160 mm with spacersUse:bicycle trailerManufacturer Number:KID217 Type 13: Thread Pitch:1.0 mmAxle Length:184 mm; 169 mm, 176 mm with spacersUse:bicycle trailerManufacturer Number:KID226Contents:1 x Robert Axle Project thru-axle for bicycle trailer1 x assembly material, consisting of:Type 1: 1 x M12 x 1.0 nut1 x washers1 x 12 mm convex spacer Type 2 / Type 12: 1 x M12x1.0 nut1 x washers1 x 6 mm flat spacer1 x 6 mm convex spacer Type 3 / Type 11: 1 x M12x1.5 nut1 x washers1 x 6 mm flat spacer Type 4 / Type 5: 1 x M12x1.75 nut1 x washers1 x 6 mm flat spacer Type 7: 1 x M12x1.5 nut1 x washers2 x R.A.T. nuts Type 8: 1 x M12x1.75 nut1 x washers Type 10: 1 x M12x1.0 nut1 x dropout insert1 x washers1 x 3 mm flat spacer1 x 6 mm convex spacer Type 13: 1 x M12x1.0 nut1 x washers1 x 3 mm flat spacer1 x 6 mm convex spacer1 x 12 mm flat spacer Weight: black | type 2: 106 g black | type 3: 100 g black | type 4: 104 g black | type 5: 110 g black | type 7: 109 g black | type 12: 100 g Manufacturer: The Robert Axle Project 45 SW Chehalem Dr Bend OR 97702 USA info@robertaxleproject.com Distributor: MERIDA & CENTURION Germany GmbH Blumenstraße 49-51 71106 Magstadt Germany vertrieb@merida-centurion.com