Spears Racing has been on the cutting edge of making new products for the little commuter style bikes for decades, most of these products come from the motorcycle being used for something other than what it was intended to be use for…RACING!!
Spears Racing’s 415 drive chain kits have been used since the early 2000’s these kits were soon copied by other company’s but never duplicated in style, engineering and return on your investment.
Spears Racing’s in stock Inventory are for the Kawasaki EX250/300/400 Ninja and the Yamaha YZF R3 2015+. This kit will reduce your unsprung weight/rotational mass by over three pounds.
Spears Racing 415 Drive chain kits is used by several BSB Junior Supersport, Motoamerica Junior Cup Teams/Racers, WSS300 and CSBK Lightweight Sportbike Championship teams as well as hundreds of club level race teams around the world.
Since the inception of this amazing product Spears Racing riders have been able to set several track records along with winning several class championships and National #1 plates.
This kit comes standard with an 18t front sprocket (17,19,20 optional) and is available with 44,45,46,47,48,49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59 and 60 tooth rear sprockets.
When making your choice for the Yamaha R-3you can go with the 18t/55t (3.05) this will be the closest to the OEM gear ratio of 3.07 (14/43).
When making your choice for the Kawasaki EX300 you can go with the 18t/54t (3.00) this will be the closest to the OEM gear ratio of 3.00 (14/42).
When making your choice for the Kawasaki EX400 you can go with the 18t/53t (2.94) this will be the closest to the OEM gear ratio of 2.92 (14/41).
When making your choice for the Kawasaki Ninja500you can go with the 18t/55t (3.05) this will be the closest to the OEM gear ratio of 3.07 (14/43).
*** Just remember that if your looking for more of a drive off the corner you will add a tooth or two.***
The rear sprocket is made from the highest grade aerospace quality 7075-T651 aluminum and weighs (6.60 oz./187 g (45t) depending on tooth count). It is machined not stamped, this way you don’t have to worry about it being ” True to the alignment” of your chain and front sprocket (no wobble).
The drive chain is a racing chain and has a tensile strength of 4,610, and weighs 2.16 lbs./982 Gms. for the Yamaha R-3 and 2.01lbs./913 Gms. for both the Kawasaki EX250/300/400cc.
The steel counter shaft sprocket is drilled to be the lightest steel sprocket on the market and the only 415 sprocket that is heat Treated/Hardened and not Zinc plated like most of the others on the market(sprocket weights 4.0z./113.398 Gms. 18 Tooth)
The large reduction in weight and friction translates to .6/.7 extra HP being transferred to the ground instead of being lost to friction. You also will notice faster acceleration and better handling by reducing the gyroscopic effect of the rotating mass.
(sprocket weights 4.05oz./115 Gms. 18t)
415 Rear Sprocket is Machined not Stamped from the highest grade aerospace quality 7075-T651 aluminum and weighs (9.64 oz./274g depending on tooth count)
Chain Hook/Holder© by Spears Racing is to assist the race Team Mechanic, racer or rider once you have removed your rear tire/wheel assembly from your Bike.
A D.I.D 415 ERZ Master Links or quick-release link is a roller chain accessory that allows convenient connection and disconnection of a chain without the need for a chain tool. It acts as a set of the chain’s outer plates, so joining two sets of the chain’s inner plate ends. Such master links may or may not be re-usable.(Rivet Style)
Purchase the correct/proper chain for your motorcycle, not like others companies who are selling 120 link chains they are just telling you to get two (2) master links.
DID 415ERZ chain has a tensile strength of 4,540 lbs ( 1 lb. 15.7 oz./898.6g )
Why convert from 520 to 415
A 520 chain is heavier and larger than a race bike in this class needs. Moving to 415 cuts pitch size, chain mass, and usually sprocket mass with it. That is rotating weight at the countershaft and rear wheel. Extra rotating mass takes more energy to accelerate and throws away horsepower as friction. A 415 chain reduces that loss so more power reaches the ground and the bike picks up revs faster.
On Ninja 250/300/400/500 KTM 390 and R3 race bikes, a 415 conversion is one of the most effective ways to shed drivetrain weight. The smaller chain also packs tighter, which helps when you are building a dedicated track or Moto3-style machine. Pair the chain with a 415 conversion kit (sprockets and related hardware) for the full weight and friction benefit.
DID 415ERZ chain has a tensile strength of 4,540 lbs ( 1 lb. 15.7 oz./898.6g )
This sprocket is made from SCM-435 case hardened steel for extended life. Lightening holes for the lightest, Heat Treated and the strongest sprockets on the market. This sprocket is not Zinc coated like a lot of the others and it will fit onto your Motorcycle with out any additional spacers of shims.
KTM RC390 415 Lightweight Sprocket is Machined not Stamped from the highest grade aerospace quality 7075-T651 aluminum and weighs 11.45 oz./324.6 g ( depending on tooth count)
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International Postal service disruptions
International Mail Service Suspensions
Updated: Oct. 1, 2021
The Postal Service™ is temporarily suspending international mail acceptance for certain destinations due to impacts related to the COVID-19 pandemic and other unrelated service disruptions.
Suspension Due to Unavailability of Transportation
| Afghanistan | Guadeloupe | New Zealand** | Tajikistan |
| Australia* | Laos | Reunion (Bourbon) | Timor-Leste |
| Bhutan | Libya | Saint Pierre and Miquelon (Miquelon) | Turkmenistan |
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These service disruptions affect Priority Mail Express International® (PMEI), Priority Mail International® (PMI), First-Class Mail International® (FCMI), First-Class Package International Service® (FCPIS®), International Priority Airmail® (IPA®), International Surface Air Lift® (ISAL®), and M-Bag® items.
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