Attention: You are purchasing closed course competition Product(s)

I acknowledge that the product(s) being purchased () was/were designed and intended for closed course competition use only. The product(s) is/are neither designed nor intended for use on public roads or land and is against Federal and State regulations to do so. By proceeding with this purchase, I , agree to only use the product(s) for closed course competition.

If an ECU tune was purchased, please send your unmodified and undamaged OEM ECU to TST Industries, located at 623 Pleasant St, Lake Helen, FL 32744.

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FREE SHIPPING OPTION FOR DOMESTIC ORDERS:

U.S. customers are offered a free shipping option for orders with a discounted subtotal greater than $150.00 (before taxes applied). The order's shipment destination must reside within the United States of America. The free shipping options still utilize our standard postage providers and 3rd party shipping companies. Does not apply to large items such as exhausts, stands, and bodywork shipping. All terms and conditions that apply to normal orders will continue to apply to orders with a free shipping option.

NO RESTOCKING FEES:

An item returned within 30 days of purchase, that includes an accurate RMA#, in a perfectly new, unopened condition, and that complies with our other return policies, will not be charged a restocking fee.

MOST QUESTIONS ABOUT THIS PRODUCT CAN BE ANSWERED ON THIS PAGE.

The most common product related questions are answered in the tabs section on this page. Be sure to carefully read through the "Product Details", "In the Box", and "FAQs" tabs. In addition, a lot of our products have comprehensive videos demonstrating installations and product features. You can find those videos in the "Videos" tab.

Note: Some product pages may not have all the tabs mentioned above. Please read through all the available tabs to find the answers to your questions. If you still need assistance, please use the "ASK A QUESTION ABOUT THIS PRODUCT" button below the tabs section.
NO ADDITIONAL COST: You pay at the time of checkout and never have to worry again.
COVERAGE: Our Limited Extended Warranty starts on the date of purchase. It covers all manufacturer defects for our TST Exclusive products. (Products manufactured by us with the exception of our WORX products)
EXPERT HELP: As always our team is here to help. If you’re unsure about this warranty or if your product is eligible, feel free to reach out to us and we can help answer any questions you may have!
PRODUCT ELIGIBILITY: TST will offer our Limited Extended Warranty on all products manufactured by TST Industries.
EASY CLAIMS PROCESS: Simply click the “Contact Us” page and fill out the “Returns Form” to begin the warranty process. Once our team receives your email and initiates the RMA, you can send your product back to us and we will repair/replace the product at no cost as long as a manufacturer defect is found. What qualifies as a manufacturer defect? Check out our Terms and Conditions for some examples!

TST WORX 420 Lightweight Aluminum Rear Sprocket for Honda Grom / Monkey / Super Cub

  • TST WORX 420 Lightweight Aluminum Rear Sprocket for Honda Grom / Monkey / Super Cub
  • Full sprocket treatment with Type III black anodized hard-coat for long-lasting durability.
  • CNC machined from lightweight 6061 aluminum alloy using advanced techniques.
  • Ultra-smooth tooth transition geometry developed by our team here at TST Industries.
  • Available in a wide range of tooth count profiles
  • Proprietary matte black anodized finish looks good on every Honda Grom, Monkey, or Super Cub
  • 2022 Honda Grom outfitted with the TST WORX 40 tooth rear sprocket.
  • Upgrade your Honda Grom with an ultra lightweight sprocket from TST Industries.

TST WORX 420 Lightweight Aluminum Rear Sprocket for Honda Grom / Monkey / Super Cub

TST WORX 420 Lightweight Aluminum Rear Sprocket for Honda Grom / Monkey / Super Cub

Our TST WORX 420 Lightweight Aluminum Rear Sprocket was developed to provide dramatic component weight loss and exceptional durability by combining high-quality 6061 aluminum alloy with advanced manufacturing and hardening anodized finishing techniques. So whether you're tearing up the streets or chasing the podium at the track, our TST WORX Rear Sprocket was designed to provide increased and long-lasting performance on your Honda 125cc beast!

Available in 34, 35, 36, 38, 39, 40 tooth counts.


APPLICATIONS:

  • Honda Grom / MSX 125 | 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025
  • Honda Monkey | 2019, 2020, 2021 (4-speed)
  • Honda Super Cub 125 | 2019, 2020, 2021 (4-speed)

This product is part of our Worx Program!

Learn More!
SKU
2022 - 2024/GROM/Honda
TST WORX 420 Lightweight Aluminum Rear Sprocket for Honda Grom / Monkey / Super Cub
 
Price: $57.99
Select Tooth Count
Quantity

ATTENTION:

If buying this product as part of the Buy Together bundle below, define these options there.

Product Feature Video

Features

  • CNC machined from lightweight 6061 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
  • Roughly 65% lighter than the stock Honda Grom rear sprocket
  • Available in a wide range of tooth count profiles

Description

When it comes to increasing the power delivery of the mighty Honda 125cc engine, the rear sprocket is a great place to start. Not only can you go up or down in tooth count to focus more power where you want it in the range, but by upgrading to a lightweight aluminum sprocket you're able to decrease parasitic power loss in the drive train. With a roughly 65% decrease in the weight of the sprocket, that means it takes less power to turn and therefore transfers more of that power to the rear wheel. That may not seem like a huge deal on a standard bike, but when it comes to the Honda Grom, Monkey, or Super Cub 125, every bit of power that you can get to the wheel counts and makes a difference. 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 6061 aluminum alloy. This high-quality material is CNC machined using a propriety holding plate process developed to eliminate vibration during the machining process and ensure 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 lightweight sprocket with exceptional durability characteristics capable of taking on the rigorous demands of the street and track.

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
Honda Grom 2022 - Current 420 15 38 108
Honda Grom 2013 - 2020 420 15 34 106
Honda Monkey 2019 - 2021 420 15 34 106

Rear Sprocket Weight Guide

Sprocket Tooth Count Weight (grams)
2022 Grom OEM Sprocket - 38 Teeth 394 g
WORX - 34 Teeth 110 g
WORX - 35 Teeth 118 g
WORX - 36 Teeth 124 g
WORX - 38 Teeth 134 g
WORX - 39 Teeth 142 g
WORX - 40 Teeth 148 g
  • (1) TST WORX 420 Lightweight Aluminum Rear Sprocket (your choice of tooth count)
  • 1 Year Warranty (See our warranty policy here)
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WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

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