Moto-master Front Sprocket 12121531 520 12T for TM Racing EN125 EN125FI EN144 EN144FI MX125 MX144 TM EN 125 FI TM EN 144 FI TM MX 125 TM MX 144

Name: Moto-master Front Sprocket 12121531 520 12T for TM Racing EN125 EN125FI EN144 EN144FI MX125 MX144 TM EN 125 FI TM EN 144 FI TM MX 125 TM MX 144
Brand: MOTO-MASTER
SKU: 12121531
Price: 14.04 GBP
Availability: InStock

Fits 10 bikes

RRP £16.52 Save 15%

£14.04

incl. VAT

In stock — delivered in 6–10 working days

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

Part #: 12121531

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§ 02 / About this part

What it is

Moto-master front sprocket 520 12T to fit TM Racing EN125 (2004–2019); TM Racing EN125FI (2020–2021); TM Racing EN144 (2008–2019); TM Racing EN144FI (2020–2021); TM Racing MX125 (2003–2021); TM Racing MX144 (2008–2021); TM Racing TM EN 125 FI (2022–2024); TM Racing TM EN 144 FI (2022–2024); TM Racing TM MX 125 (2022–2024); TM Racing TM MX 144 (2022–2024).

This countershaft sprocket sits on your bike's output shaft to drive the final transmission. It is a high-wear component. Inspect it regularly for hooked teeth or thinning profiles. Abrasive mud and grit accelerate wear during heavy sessions. Adjusting the tooth count alters your bike's final drive ratio for technical terrain or faster tracks. Clean the countershaft splines thoroughly before installation. Fit a new circlip or lock washer to secure the assembly. Pair this with a new chain to prevent premature wear on the fresh teeth. This steel construction matches OEM specifications for fitment and durability.

§ 03 / Specs

The numbers

Brand: MOTO-MASTER
Part number: 12121531
Category: Sprockets
Weight: 0.13 kg
VAT: 20%

// Fitment

Will it fit your bike?

Fits 10 models · 10 year-bands

TM Racing 10 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.