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A) Kart Rear Width Measurement (RWM) Assistant (free shipping within the US for limited time)
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A) Kart Rear Width Measurement (RWM) Assistant (free shipping within the US for limited time)

$39.99

The XYZ Karting Rear Width Measurement (RWM) Assistant makes measuring the width of your kart rear wheels faster, easier, and more consistent; specially when working alone without the help of a second person.  It securely attaches to the rear wheels, providing a reliable reference point for quick, repeatable measurements, whether you're in the garage or at the track. Precision 3D printed in the USA from carbon fiber reinforced nylon for exceptional strength and durability.

Tested on most common wheel brands (OTK MXCs, MXJs, Aluminum, AMVs, Douglas, Freelinee, etc.)  

Please find written instructions (printed and included in the packaged product) in this link:

https://cdn.shopify.com/s/files/1/0686/7851/6778/files/2026June_XYZKarting_RWM_User_Instructions_v2.pdf?v=1783696341

Also, there is a video of the RWM operation in the product pictures; or in this other link:

https://cdn.shopify.com/videos/c/o/v/c5bfbbb9997747ebb03a4b04f9258386.mp4

Currently offering free shipping within the United States, for a limited time. 

Compatibility & Returns

The RWM Assistant has been tested with several common kart wheels and small/mid size measuring tapes, but we can not guarantee compatibility with every wheel or tape out there.

Most small/mid size measuring tapes (e.g., <16ft) should work. If yours does not, an inexpensive compact tape is recommended.

If the RWM Assistant does not properly fit your kart wheel, contact us within 30 days of delivery for a return and refund.

Product must be returned in its original condition. Original shipping charges, if any, are non-refundable.

Patent Pending. Designed, tested, and manufactured in the USA.