Moto-master Front Sprocket 12121540 428 16T for TM Racing MX 85 JUNIOR MX 85 JUNIOR 17/14 MX 85 JUNIOR 19/16 MX85 TM MX 85

Name: Moto-master Front Sprocket 12121540 428 16T for TM Racing MX 85 JUNIOR MX 85 JUNIOR 17/14 MX 85 JUNIOR 19/16 MX85 TM MX 85
Brand: MOTO-MASTER
SKU: 12121540
Price: 14.31 GBP
Availability: InStock

Fits 5 bikes

RRP £16.84 Save 15%

£14.31

incl. VAT

In stock — delivered in 6–10 working days

Dispatched in 2–3 working days · delivered in 6–10.

Part #: 12121540

Authorised stockist

MOTO-MASTER

14-day returns

Easy & hassle-free

Secure checkout

256-bit encryption

§ 02 / About this part

What it is

Moto-master front sprocket 428 16T to fit TM Racing MX 85 JUNIOR (2013–2016); TM Racing MX 85 JUNIOR 17/14 (2017–2021); TM Racing MX 85 JUNIOR 19/16 (2017–2021); TM Racing MX85 (2013–2019); TM Racing TM MX 85 (2022–2024).

This component sits on the gearbox output shaft to drive your chain. It handles the highest torque loads in the drivetrain. Teeth eventually hook and thin out from constant grit and mud exposure. Inspect for hooking every few rides. Replace this alongside your chain and rear sprocket to prevent premature wear on new parts. Ensure the lock washer is bent or the circlip is fully seated during installation. Verify the specific torque setting for the countershaft nut in your workshop manual. This part is machined for a precise fit on your specific spline pattern.

§ 03 / Specs

The numbers

Brand: MOTO-MASTER
Part number: 12121540
Category: Sprockets
Weight: 0.15 kg
VAT: 20%

// Fitment

Will it fit your bike?

Fits 5 models · 5 year-bands

TM Racing 5 models

* Fitment data is provided as a guide. Verify compatibility against the bike's owner's manual or service handbook before ordering. Iron Offroad accepts no liability for incorrect application. Full terms and conditions apply.

§ 05 / About Iron Offroad

Iron Offroad

Iron Offroad is the off-road sibling of Iron City and Iron Stable — a UK shop for motocross, enduro, and trail-bike hard parts. Every fitment lives on the site, listed against KTM, Husqvarna, GasGas, Yamaha, Honda, Kawasaki, Suzuki, and Beta. Pick your bike on the timing-tower. Our USP is the data: fully enriched fitment so you find the right part for your bike quickly and get it fitted accurately. Brands you'd find on a paddock workbench — pads, sprockets, plastics, fork seals, cables, gaskets, bars, the things that actually wear out. Road-bike kit, scooter parts, and quad gear sit elsewhere; dirt and e-moto only. We operate from our storage facility in Leeds. Iron Offroad is a trading name of Iron Stable Ltd, registered in Mildenhall — Company No. 17061294. The business has a rich motorcycle history across multiple moto brands — the photos show where we came from — and recently pivoted into hard parts and online retail.