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Weaver® W-937M-40 Motorcycle Wheel Balancer

Weaver® Equipment

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Trusted the world over, the Weaver® W-937M-40 is a true Commercial Grade Motorcycle Wheel Balancer that is built for the demands of a commercial motorcycle shop in our most compact space-saving design.  The W-937 has become one of America's Best Selling Wheel Balancers since 2007.  Why have they become so Popular?  As our reviews confirm, Weaver® Wheel Balancers are Accurate on all wheel types, Reliable in demanding shops, have ALU programs for tape on weights on nice rims.  All Weaver® tire changers and balancers are manufactured by Nexion, the Italian company that invented the first wheel clamp tire changer in 1962.  But we don't stop there!  It is a 30+ year tradition that we take care of our customers after the sale with a huge parts inventory and Great Customer Service.  Now with FREE Light Truck Cone Kit, $250.00 Value!  

FREE SHIPPING!  Includes Free Residential and Free Lift Gate Service!  

The Weaver® W-937M-40 Motorcycle Wheel Balancer provides a complete balancing system for most types of motorcycle wheels as well as most cars and trucks.  This system includes both the W-MJ II motorcycle wheel clamp/shaft kit and the car/truck shaft kit as standard equipment.

Components used in the W-937M-40 are state of the art designs typically reserved for more expensive wheel balancers.  Incorporated into the design is an easy to use data entry sequence, Static and Dynamic balancing along with multiple balance modes for a variety of weight placements.  The user calibration is a quick and easy two step process that utilizes fast software updating using a real test weight sequence. 

The standard W-MJ II 14mm motorcycle shaft kit allows balancing on most motorcycle wheels.  Larger wheels typically 180mm and up will require the optional W-MJ I 937/957 (40mm) 19mm shaft kit.  The wheel clamp is included with the W-MJ II kit and is therefore not repeated in the W-MJ I kit. 

The Weaver® W-937M-40 will handle motorcycle/car/truck rims up to 24" in diameter as well as wheel widths up to 20" and tire/wheel assemblies weighing up to 143-lbs.  Bigger truck tires are no problem with this machine.  The standard car/truck cone set (4 cones) have been Custom Tapered to accommodate a range from 1.625" - 6.125" center holes and Now with FREE Light Truck Cone Kit, $250.00 Value!  (optional dually truck cone kitBeware! - Some brand X balancers offer 4 old style cones that only go up to 5" center holes in the hope they can sell you a 5th cone set to do trucks for another $270.00 - Buyer Beware!  Less cones that do more,...That's Cool!  

Also Beware of some brand X balancers that claim to be "Professional Grade or Commercial Grade" yet only use a 1/4 H.P. motor compared to our True Rated 1/3 H.P. motors.  The Weaver® W-937-40 and W-957-40 balancers are true Commercial Grade machines.  

The Weaver® W-937-40 is manufactured by Nexion and carries a 1-year limited warranty. Nexion is the Italian Manufacturer Nexion SpA which owns the Italian Brands; Corghi, HPA Faip, Mondolfo Ferro, Orlandini, Sice, Tecnomotor, Teco and Bright. Nexion is a worldwide leader in wheel service equipment since 1962 and is recognized internationally for their reliable and accurate products due to the oversight by the Italian Design Engineers. All wheel clamp style tire changers in the world are a result of Italian invention. 

All Weaver® Brand Equipment is manufactured in ISO9001 certified factory with products that have earned the CE certification as labeled on every machine. Nexion has consistently built and provided components to some of the largest brand name products throughout Europe, Asia and the USA including Bend Pak tire changers, Ranger tire changers, Corghi tire changers, Dunlop tire changers, Bosch tire changers and many more. We are simply providing some of their best products Direct to you at the lowest possible price.

Parts are in stock for immediate support on all of our Weaver® models.  We have sold and serviced these models since 2007 with an excellent track record and warranty levels that are consistently at or below the Big Brand names.  We believe all of our Weaver branded products provide the highest quality at an unbeatable price.  Since 1984, Derek Weaver Company has only carried products that we can stand behind with confidence to deliver the results we all desire.       


  • No Hood - Low Speed Technology
  • Accurate to 1 gram
  • Self Calibrating - Requires 15" or 16" steel wheel and tire
  • Weight Storage
  • Accessory Pegs
  • 14mm Motorcycle Clamp/Shaft Kit with Sleeves and Cones 
  • 8” Long 40MM Car/Truck Shaft
  • Four Car/Truck Cones
  • ST, AL1, AL2, AL3 Balancing Modes
  • Speed Nut, Weight Hammer and Caliper Standard Accessories
  • Optional W-MJ I 937/957 (40mm) Large 19mm Motorcycle Shaft Kit
  • Optional Large Truck Cone Kit


  • Tire/Rim Weight Capacity: 143-lbs.
  • Accuracy: 1 gram
  • Shaft Size 8" Long x 40mm
  • Tire Diameter: 39"
  • Rim Diameter: 10"-24"
  • Small Cone: 44mm - 65mm (1.73 - 2.56") For 40MM Shaft (inside mount W-TB-P-0300031)
  • Medium Cone: 54mm - 78mm (2.13 - 3.10") For 40MM Shaft (inside mount W-TB-P-0300032)
  • Large Cone: 74mm - 108mm (2.91 - 4.25") For 40MM Shaft (outside mount W-TB-P-0300033)
  • Truck Cone: 90mm - 158mm (3.54 - 6.22") For 40MM Shaft (outside mount W-TB-P-0300034) 
  • Truck Spacer Ring
  • Power Requirement: 110 Volt 60Hz 1 Phase 20 Amp
  • Data Entry: Keypad
  • Rim Width: 1.5"-20"
  • Shipping Weight: 359-lbs.
  • Motor : 1/3 H.P.

WARRANTY - All Weaver® Brand Wheel Balancers and Tire Changers carry a 1 Year Warranty.  Our CE Certified Wheel Balancers and Tire Changers are NOT limited by this warranty and also carry a 1 Year Warranty on all Electronic Components.  Weaver® Brand Wheel Balancers and Tire Changers are non-returnable/non refundable items.  Warranty defects will be solved under the machine warranty.  Beware of sellers who claim higher quality electrical components and yet will not warranty them beyond 90 days!


With the optional W-MJ I 937/957 (40mm) 19mm shaft kit, you can also balance a wider range of motorcycle wheels.


The Weaver® W-937M-40 is proudly manufactured by the Italian Group Nexion SpA.  Nexion comprises nine major Italian wheel service brands: Corghi®, HPA Faip®, Mondolfo Ferro®, Orlandini®, Sice®, Tecnomotor®, Teco®, Bright®, and Stenhoj®.  Based in Italy, Nexion has operations worldwide, including manufacturing centers in Italy, Europe, and Asia.footer-nexion.png

7 Reviews

  • 5

    Posted by Robert Gilson on 30th Oct 2020

    Great product great price

  • 5
    Easy setup

    Posted by Gregory Tiratira on 16th Oct 2020

    Great wheal balancer. Great price!

  • 5
    Motorcycle balanced

    Posted by richard hodges on 26th Jun 2020

    Works well. Nice equipment.

  • 5
    Awesome Balancer

    Posted by Ray Jackson on 7th Sep 2018

    Very good price and service

  • 5
    Great product @ a great price

    Posted by Thank Q on 29th May 2018

    The Motorcycle Wheel Balancer works very well, I have had the balancer for a number of years now and it has worked flawlessly. No issues or down time. Thanks for the great motorcycle Wheel Balancer

  • 5
    Great product

    Posted by Unknown on 16th May 2017

    Easy to use and DW as always were great to order from. Freight from Old Dominion was also excellent.

  • 4

    Posted by motorcyclemcs0zpv on 9th Nov 2012

    quick service looks good

Operation Manuals
Parts Manuals
Motorcycle Adapter:
MJ II Assembly and Instruction Manual
Quick Start Quide

Derek Weaver Company is proud to offer our high quality products with free shipping or warehouse pickup. Here's how it works...


All Products on our website are offered with "Free Shipping". This means the freight charges are included in the price. Most of our products weighing less than 800-lbs. are offered with “Absolute Free Shipping” which means there are no extra fees. In this case you will notice the phrase “FREE SHIPPING! Includes Free Residential and Free Lift Gate Service!”, in the description of the products page. Absolute Free Shipping also means there are no additional fees for Liftgate Service or Residential Delivery. The only additional fee that you may incur would be if the address were changed during shipment which would incur a reconsignment fee by the freight carrier that we would only pass on if it were not our mistake.

For equipment over 800-lbs (most 2 & 4-Post lifts) there are some limitations for Free Shipping depending on weight and delivery location. In this case you will notice the phrase “Free Shipping To Over 85% of the USA - See Where It's Free” in the description of the products page. Most of the USA will require no additional fee. This applies to over 85% of the continental USA (lower 48 states). Free shipping does not apply to Alaska or Hawaii. Some parts of the country are affected by higher freight rates due to the combination of weight and delivery location which will require a small additional charge to cover the higher rate charged by the freight carriers. Our shopping cart will not calculate the difference (added fee), so we will contact you if this is the case. Rather than advertise the higher rates across the board we choose to show the lowest possible cost to most of the country. Like “Absolute Free Shipping” there will be no extra charge for lift gate or residential delivery. The following areas may have additional freight: North Western US, North Eastern US, Long Island, Western Colorado, the Dakotas, some parts of Florida & California and any area deemed a remote location by the freight company. Prior to ordering give us a call at 817-560-9510 or email and we can provide accurate information regarding Free Shipping or any additional charges.


Shipping and delivery time given during the freight quote process is an estimated time of delivery given by the carrier. Choosing Liftgate Delivery may extend delivery times due to limited liftgate equipment at the delivering terminal. Meeting the delivery schedule is subject to the day the freight is shipped and the carrier’s ability to meet their schedule. Derek Weaver Co., Inc. does not guarantee that a carrier can meet their projected delivery time but we will provide you with the proper tracking information by email so you can follow the tracking time and arrange for special delivery needs with the carrier as needed. Any additional fees incurred as a result of consignee being unable to meet scheduled delivery time or cause for redelivery or reconsignment to a different location will be at consignee’s expense.


Choosing Residential may extend the estimated delivery time due limited liftgate trucks at the delivering terminal, additional communication and handling by the freight company. Please keep this in mind when choosing residential delivery.


Make sure you can unload the freight. A forklift or lifting equipment is required for items over 800-lbs. The trucking company is only responsible for delivery to your loading dock if delivered to a business address or curbside if a residential lift gate delivery. Lift gate service is available for some equipment and can assist in unloading 2 and 4-post lifts however you will still need a forklift. Liftgate capacity is typically 1000-lbs and cannot unload a 2 or 4-post lift on its own.


If you are unable to unload a truck, we have the option of letting you pick the freight up at the closest terminal to your location. When picking up at a terminal, the freight company will load your truck or trailer for you which is included in the freight cost. Call our office (1-817-560-9510) to determine the location of the closest terminal. If you require terminal pickup please place a note in the comment box requesting terminal pickup and we will contact you with the terminal location. Covered trailers or trailers with ramps are not acceptable as they prevent the forklift from getting the load into the trailer. They will not drive onto a ramped trailer. Please remove the ramps prior to picking up if possible.

All shipments must be inspected immediately upon receipt



Choose this option if you have minor dings and scratches or a part that needs replaced to make the unit satisfactory. Make note of the damage before you sign the freight bill. You will be responsible for filing the freight damage claim with the carrier. Derek Weaver Co, Inc. will provide any replacement parts or touch up paint needed should you choose this option and the carrier should provide for reimbursement. If you have any questions or need further assistance, please call our customer service department @ 1-817-560-9510


Choose this option if the carrier has severely damaged the freight beyond your judgment of a simple repair. Derek Weaver Co, Inc. will file all freight claims. Get a copy of the freight bill from the truck driver and email it with a brief explanation of the situation to us. A replacement will be shipped as soon as we verify possession of the freight with the carrier.


If you would like to pick-up the item at one or our warehouses, please call ahead to make sure the item is in stock and schedule your pick-up. Picking up at our warehouse will save you in freight fees but will require sales tax to be collected. If you do not see a pickup price on our website for the product you are interested in you may call our office for more information.

In Texas we load Monday – Friday by appointment only.

In North Carolina we load Monday – Friday by appointment only.

All Two Post and Four Post Lifts require trailer for pickup. Be prepared for pick-up by understanding the item’s weight and dimensions and using the proper truck and/or trailer for hauling. We cannot load open or enclosed trailers with ramp gates. Our warehouse will load the item onto your vehicle and/or trailer but is not responsible for properly securing the load on your vehicle and you will need to make sure you have the proper straps and equipment for hauling. All items for local pick-up are charged state sales tax at the appropriate local rate. If you have any questions or need further assistance, please call our customer service department @ 1-817-560-9510

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