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Polaris 120

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Arctic Cat 120


Drive Train

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Polaris Drive Train

Billet Aluminum Drive Sprockets (120s)

  • Olson Brother's precision machined billet aluminum sprockets are ultra light while maintaining strength and long life.

  • We start with light-weight, high-grade aluminum and machine each sprocket to perfection.

  • While almost all our competitors have Chinese stamped sprockets that are typically warped and have non-chamfered teeth that break chain, our sprockets are machined from solid aluminum bar stock to make a perfect sprocket that runs completely true with no wobble and guides the chain onto the teeth without chain binding..

  • For use on all 120cc sleds; #35 or #420/41 chain.

  • Note: All of these sprockets require Olson Brother's billet aluminum sprocket hub.

Aluminum Drive Sprocket, #35        $29.95       

Aluminum Drive Sprocket, #420      $29.95       

OBDi now carries 41 tooth #420 Sprockets!!!

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Aluminum Sprocket Hubs (120s)

  • These light-weight hubs are an integral part of changing the gear ratios on your sled.

  • Strong, durable, thoroughly tested and proven; there has never been a single failure of our hubs.

Aluminum Sprocket Hub              $33.95       

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Interchangeable Clutch Sprockets (120s)

  • For use with Stinger & Titan drum clutches and Tomar disk Clutches.

  • These versatile parts give you the flexibility to run either 35 or 420 chain and easily adjust gear ratios.

  • Get the hole-shot and overall speed you desire by interchanging these clutch sprockets.

  • Must be used with Titan, Stinger and Tomar clutches on most sleds.

Interchangeable Clutch Sprocket, #35      $29.95   
Interchangeable Clutch Sprocket, #420    $29.95   

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Deluxe Chain Tensioner

  • This chain tensioner is 5" long, 2.2" wide, and 1.7" thick including the roller and bolt. The aluminum plate can be mounted anywhere on the tunnel you choose to place it and it mounted with either two 1/4" bolts or four 3/16" rivets, the choice is yours. Although sprockets are much cheaper to use, we have choosen to use a high quality roller that's 15/16" wide so it's very forgiving no matter where your chain is running and it's one less sprocket you have to shim to be in alignment with the clutch and driven sprockets. The roller has nearly 3" of travel to tension the chain to your preference and is very quickly adjusted.

Deluxe Chain Tensioner



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Deluxe Replacement Roller

  • This is the roller used on the Deluxe Chain Tensioner. Although we've never had to sell a replacement yet, they are available if a roller ever wears out.

Deluxe Replacement Roller

Retail is $34.99



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Deluxe Roller Kit

  • This kit allows a person who has the standard chain tensioner to upgrade to the deluxe model. The kit contains the roller, bushing, carriage bolt, washer and lock nut.

Deluxe Roller Kit

Includes the above roller, aluminum bushing, carriage bolt, stainless steel fender washer and lock nut. Everything except the mounting plate.



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Polaris Skid Wheel Kit

  • This kit lifts the track away from the slide rails slightly to remove some friction and allows the track to spin more freely.
  • These kits contains wheels and all mounting hardware.
  • More than 80% of the friction comes from the front of the slide rail where most of the pressure is applied, and therefore we sell our kits with either two wheels for 1/2 the price or the full four wheel kit if you're racing grass drags or just want the extra support.

Skid Roller Kit, 2 pack



Skid Roller Kit, 4 pack



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Drive Chain (120s & Kitty Cats)


  • Our gold chain is made from lightweight Chromalloy steel construction with seamless rollers and bushings, then heat treated to produce an even stronger chain. This is the strongest #420 chain on the market today with a wear index of 300 and tensile strength of 5000.

  • Works great on all 120s, but a must have for the Arctic Cat Z-120 where chain heat from the exhaust is a major issue.

  • Available by the length, which is a minimum of 4' (100 links) depending on what our distributor has available. The price remains the same for all lengths.

Gold Chain (100 or more links w/master)             A01-0181            $19.95

Gold Master Link                                            A01-0185            $1.99


  • Much stronger than OEM yet more affordable than our premium gold chain


  • Has a wear index of 100 and tensile strength of 3520.

      * Enter desired length in quantity field in shopping cart.

Standard (100 link box w/master)                         A01-0171           $12.95

Standard 420 Master Link                                        A01-0178           $2.00

Standard 420 Chain 1/2 link                                       A01-0179          $2.00


  • Several times stronger than standard #35 chain.

     * When buying by the link, enter desired number of links in quantity field in shopping cart. Each large and small link counts as separate links. The easiest way to count the number of links you need is to count the holes in the chain where the teeth of the sprocket go and make sure you count the hole for the master link or your chain will be too short.

Space Chain (By The Foot)                           A01-0103                $3.50

Space Chain (70 Links) Fits OEM Kitty Cat       A01-0105                 $10.00

Space Chain Master Link                               A01-0104                  $1.89



  • EK chain combines the qualities of high tensile strength, low wear, impact resistance, anti-kinking performance and fatigue toughness to produce the best kart racing chain available..

  • Available in box of 40" (106 links).

  • Pins are Chromium Carbide coated offering superior impact and shock absorption and reducing oxidation.

EK Silver Pro Chain (106 Link w/master)                A01-0111            $23.95

EK Silver Pro Master Link                                   A01-0113            $2.25



  • An EK chain that is manufactured to be the highest strength and most wear resistant #35 chain anywhere. Much stronger than standard space chain or Silver Pro chain.  This is the premium #35 chain of all.

  • Works great on Kitty Cats or 120cc snowmobiles, but engineer for high torque applications.  Ideal for F1 and Champ class racers.

  • Available in box of 40" (106 links).

  • NOTE:  This chain is a complete and continuous 106 link masterless chain with no master link.  If you'd like me to make a masterless chain for you to a special length, please text message, email or call me before ordering wtih the number of links you'll need. Otherwise, you can use a Silver Pro master link, but it will be the weakest link in the chain.

EK HT (High Tensile) Chain (106 Link wo/master)   A01-0116            $26.95

EK HT (High Tensile) Master Link            A01-0117            $2.50


  • This is a good, yet affordable, #35 race chain that replaces the OEM Kitty Cat chain or can be used on upgraded 120cc minis.

      * Enter desired length in quantity field in shopping cart.

#35 Std. (10' w/master)                             A01-0123         $19.95

#35 Std. (by the foot)                                A01-0133          $4.00*

#35 Std. Master Link                                 A01-0136          $1.29

#35 Std. 1/2 Link                                      A01-0137           $1.99

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    Related Items:

     Deluxe Chain Break Tool

Premium #35 Chain Break

  • Small but Heavy Duty.

  • For #35 chain.

Premium Chain Break                                  $27.95              A01-0191   

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