{"product_id":"sitta-201m","title":"Sitta Aluminium Rear Sprocket Yamaha YZF-R6 RJ11, RJ15 \u0026 RJ27 (2003-2026) 201M – 37-48 Teeth, 520 Pitch","description":"\u003cp\u003eIf 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.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLightweight aluminium construction at only 350 g (size 45), reducing unsprung and rotating mass for sharper throttle response\u003c\/li\u003e\n\u003cli\u003eFull 520 pitch compatibility, optimised for performance road and track use\u003c\/li\u003e\n\u003cli\u003eTwelve tooth options from 37 to 48 teeth, allowing precise gearing tuning for any riding style or circuit\u003c\/li\u003e\n\u003cli\u003eSprocket carrier pattern 110\/130-6 bolt for accurate, straightforward fitment\u003c\/li\u003e\n\u003cli\u003eAvailable in eight finishes: silver, black, hard-anodised, red, blue, gold, orange and green — hard-anodised offering greater surface durability than standard anodising\u003c\/li\u003e\n\u003cli\u003eEngineered for consistent power transfer and low wear even under sustained high load\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eGearing — Choosing the Right Tooth Count\u003c\/h2\u003e\u003cp\u003eSelecting 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.\u003c\/p\u003e\u003cp\u003eA 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.\u003c\/p\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003ch2\u003eBuild Quality and Finish\u003c\/h2\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003ch2\u003eFitment and Compatibility\u003c\/h2\u003e\u003cp\u003eThe Sitta 201M rear sprocket is designed and confirmed for the following models:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eYamaha YZF-R6 RJ11 (2003–2004)\u003c\/li\u003e\n\u003cli\u003eYamaha YZF-R6 RJ15 (2006–2007)\u003c\/li\u003e\n\u003cli\u003eYamaha YZF-R6 RJ27 (2008–2026)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eCompatible with 520 pitch chains only. Part number: 201M.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSitta\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003e201M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eapprox. 350 g (at size 45)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChain Pitch\u003c\/th\u003e\n\u003ctd\u003e520\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Range\u003c\/th\u003e\n\u003ctd\u003e37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSprocket Carrier\u003c\/th\u003e\n\u003ctd\u003e110\/130 — 6 bolt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable 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