Renthal Front Sprocket 12122042 520 13T for Gas Gas EC250F EC300F Yamaha WR250F WR250R WR250X YZ125 YZ125X YZ250F

Name: Renthal Front Sprocket 12122042 520 13T for Gas Gas EC250F EC300F Yamaha WR250F WR250R WR250X YZ125 YZ125X YZ250F
Brand: RENTHAL
SKU: 12122042
Price: 20.08 GBP
Availability: InStock

Fits 8 bikes

RRP £25.10 Save 20%

£20.08

incl. VAT

In stock — delivered in 6–10 working days

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

Part #: 12122042

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§ 02 / About this part

What it is

Renthal front sprocket 520 13T to fit Gas Gas EC250F (2013–2015); Gas Gas EC300F (2013–2015); Yamaha WR250F (2001–2024); Yamaha WR250R (2008–2017); Yamaha WR250X (2008–2011); Yamaha YZ125 (2005–2027); Yamaha YZ125X (2020–2027); Yamaha YZ250F (2015–2023).

This component sits on the gearbox output shaft to drive your final transmission. CNC machined from case-hardened steel, it handles the high torque loads of MX and enduro. Replace this part when teeth show visible hooking or thinning. Swapping tooth counts allows you to tune your power delivery for specific tracks. Dropping a tooth adds snap for tight technical sections while adding a tooth increases top-end for fast open trails. Always install with a fresh lock washer or circlip. Match this with a new chain and rear drive gear to ensure even wear across the entire system.

§ 03 / Specs

The numbers

Brand: RENTHAL
Part number: 12122042
Category: Sprockets
Weight: 0.11 kg
VAT: 20%

// Fitment

Will it fit your bike?

Fits 8 models · 8 year-bands

Gas Gas 2 models

Yamaha 6 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.