Sitta Aluminium Rear Sprocket Yamaha YZF-R6 RJ11, RJ15 & RJ27 (2003-2026) 201M – 37-48 Teeth, 520 Pitch

If you ride a Yamaha YZF-R6 and want a rear sprocket that delivers measurable performance gains without the premium price of exotic materials, the Sitta 201M is the straightforward, sensible upgrade. Weighing just 350 g at size 45, this precision-machined aluminium sprocket covers every tooth count from 37 to 48 and fits every R6 variant from the 2003 RJ11 through to the 2026 RJ27 — making it one of the most versatile and accessible gearing solutions available for this chassis.

Key Features

• Lightweight aluminium construction at only 350 g (size 45), reducing unsprung and rotating mass for sharper throttle response
• Full 520 pitch compatibility, optimised for performance road and track use
• Twelve tooth options from 37 to 48 teeth, allowing precise gearing tuning for any riding style or circuit
• Sprocket carrier pattern 110/130-6 bolt for accurate, straightforward fitment
• Available in eight finishes: silver, black, hard-anodised, red, blue, gold, orange and green — hard-anodised offering greater surface durability than standard anodising
• Engineered for consistent power transfer and low wear even under sustained high load

Gearing — Choosing the Right Tooth Count

Selecting the correct rear sprocket tooth count has a direct influence on the way the R6 pulls through the rev range. It is worth understanding the trade-off before ordering.

A smaller sprocket (37–42 teeth) lowers the overall gearing ratio, raising top speed and reducing engine revs at motorway pace — useful for long-distance road riding or high-speed circuits where sustained full-throttle stretches dominate. A larger sprocket (43–48 teeth) raises the overall ratio, sharpening acceleration and making the bike feel more aggressive out of slow and medium-speed corners — the preferred choice for technical circuits and enthusiastic road riding where drive out of bends matters more than outright top speed.

The Sitta 201M range covers the full spectrum, so whether you are chasing lap times at a track day or simply want a sprocket that suits your daily commute and weekend mountain roads, the right option is available without sourcing a different product entirely.

Build Quality and Finish

The 201M is machined from high-grade aluminium, balancing the need for low weight against the durability demands of a 520 pitch chain running under race-derived loads. The hard-anodised finish option provides a harder surface layer than conventional anodising, extending the service life of the teeth and retaining the visual finish longer under chain contact and road grime. The remaining seven colour options — silver, black, red, blue, gold, orange and green — are standard anodised, offering a clean, corrosion-resistant surface that holds its colour well over normal service intervals.

The 110/130-6 bolt carrier pattern ensures the sprocket locates precisely on the standard R6 hub with no modification required, keeping installation time short and fitment repeatable across the full 2003–2026 model range.

Fitment and Compatibility

The Sitta 201M rear sprocket is designed and confirmed for the following models:

• Yamaha YZF-R6 RJ11 (2003–2004)
• Yamaha YZF-R6 RJ15 (2006–2007)
• Yamaha YZF-R6 RJ27 (2008–2026)

Compatible with 520 pitch chains only. Part number: 201M.

Specifications