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TST WORX 520 Lightweight Aluminum Rear Sprocket for Yamaha YZF-R3 2015+ / MT-03 2020+

TST WORX 520 Lightweight Aluminum Rear Sprocket for Yamaha YZF-R3 2015+ & MT-03 2020+ Ultra lightweight 7075-T6 aluminum alloy construction. CNC machined using specifically designed techniques to ensure extreme precision. Black anodized finish provides a rear sprocket that stands out with style and design. The TST WORX Rear Sprocket was designed bring performance to the track or street. Developed, tested, and proven on our Moto3 National Championship winning TST R3 Superbike. Bred from the most demanding ridinging conditions and ready to improve your Yamaha R3 on the street or track. Close up view of the TST WORX durability demonstrated on the Yamaha MT-07 after 4,000 miles.

TST WORX 520 Lightweight Aluminum Rear Sprocket for Yamaha YZF-R3 2015+ / MT-03 2020+

Our TST WORX 520 Lightweight Aluminum Rear Sprocket was developed to provide dramatic component weight loss and exceptional durability by combining high-quality 7075-T6 aluminum alloy with advanced manufacturing and hardening anodized finishing techniques. So whether you're riding the street or dragging elbow at the track, our TST WORX Rear Sprocket was designed to provide increased and long-lasting performance on your Yamaha R3.

Available in 40-48 tooth counts.


Yamaha YZF-R3 | 2015, 2016, 2017, 2018, 2019, 2020

Yamaha MT-03 | 2020

This product is part of our Worx Program!

Learn More!
SKU SPKT29-52040
Weight 0.75 LBS
Price: $69.99
Select Tooth Count
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If buying this product as part of the Buy Together bundle below, define these options there.


  • CNC machined from lightweight 7075-T6 aluminum alloy using advanced techniques
  • Full sprocket treatment with Type III black anodized hard-coat for long-lasting durability
  • Proprietary matte black anodized finish
  • Proprietary tooth profile
  • Ultra-smooth tooth transition geometry
  • Approximately 72% lighter than the stock Yamaha rear sprocket setup
  • Available in 40-48 tooth profiles


Designed and built by race engineers in the TST WORX race program, our Lightweight Aluminum Rear Sprocket was developed with the harshest riding conditions in mind. Our use of the best materials and manufacturing procedures ensure practical longevity while maximizing weight loss for increased performance and power delivery. The blend of high-quality material, advanced hardening procedures, lightweight design, proprietary tooth profile, and ultra-smooth tooth transitions ensure exceptional performance even during the most demanding riding situations.

We produce every TST WORX Rear Sprocket from 7075-T6 aluminum alloy. This high-quality material is CNC machined using a propriety holding plate process developed to eliminate vibration during the machining process an ensuring extreme precision and material integrity. We then treat the entire rear sprocket with a matte black Type III hard coat anodizing process that penetrates the aluminum and builds an ultra-hard surface layer, resulting in a light weight sprocket with exceptional durability characteristics capable of taking on the rigorous demands of the street and track. It's time to give your Yamaha the sprocket and performance it deserves.

Be sure to check the "Specs" tab for even more info on tooth count, sprocket weight, and fitment.

Application Spec Sheet

Model Years OEM Pitch OEM Front Sprocket OEM Rear Sprocket Chain Length
Yamaha YZF-R3 2015 - Current 520 14 43 112
Yamaha MT-03 2020 - Current 520 14 43 112

WORX Rear Sprocket Weight Guide

Sprocket Tooth Count Weight (ounces)
40 Teeth 7.97 ounces
41 Teeth 8.47 ounces
42 Teeth 8.82 ounces
43 Teeth 9.17 ounces
44 Teeth 9.59 ounces
45 Teeth 10.09 ounces
46 Teeth 10.45 ounces
47 Teeth 10.87 ounces
48 Teeth 11.31 ounces
  • (1) TST WORX 520 Lightweight Aluminum Rear Sprocket (your choice of tooth count)
  • 1 Year Warranty (See our warranty policy here)

WARNING: Cancer and Reproductive Harm -


Customer Reviews:

Average customer rating:
(1 reviews)  

1 Most useful customer reviews (see all reviews):
Jake B
Aug 20, 2020
Very impressed with the quality and finish, along with the weight reduction this is a huge performance upgrade.

Advantages: Substantially less weight from OEM Sprocket and has an awesome look and finish to it. Rotational mass reduction is huge on any bike especially on the smaller bikes.

Disadvantages: Not having it sooner!
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