Sitta Aluminium Rear Sprocket Yamaha YZF-R6 RJ11, RJ15 & RJ27 (2003-2026) – 525 Pitch, 37-48 Teeth (201M)

Engineered for the Yamaha YZF-R6 across all three chassis generations — RJ11, RJ15 and RJ27 — the Sitta 201M aluminium rear sprocket delivers a precise, secure fit that makes installation straightforward and long-term reliability a given. Available in tooth counts from 37 to 48 and eight distinct finishes, it gives every R6 rider a single part that covers both gearing strategy and personal expression without compromise.

Key Features

• Featherlight aluminium construction tips the scales at just 350 g (size 45), reducing unsprung mass and sharpening throttle response without sacrificing rigidity.
• 525-pitch teeth precisely machined for consistent chain engagement and minimised wear across both track sessions and high-mileage road use.
• Six-bolt carrier pattern 110/130-6 ensures a flush, rattle-free mount on all compatible R6 rear hubs — no adapters, no fuss.
• Hard-anodised finish option outlasts standard anodising, resisting chain abrasion and road grime significantly longer for riders who demand maximum longevity.
• Eight colour choices — silver, black, hard-anodised, red, blue, gold, orange and green — let you tailor the drivetrain's appearance to the rest of the build.
• Broad tooth range (37-48) covers everything from top-speed-oriented circuit gearing to short, aggressive street ratios in a single part number.

Gearing Strategy Made Simple

Selecting the right rear sprocket tooth count has a direct and measurable effect on how your R6 feels at every point in the rev range. Understanding the trade-offs lets you choose once and ride with confidence.

A smaller sprocket in the 37-42 tooth range raises the overall gearing, reducing engine revs at motorway speeds and unlocking a higher top speed on long straights — the preferred choice for circuits with sustained high-speed sections or touring-oriented road riders.

Stepping up to the 43-48 tooth range shortens the gearing, placing the R6's powerband to work earlier in each gear. The result is crisper acceleration out of slow corners, more responsive roll-on delivery and a more agile feel through technical sections — ideal for tight, twisty circuits or urban sport riding.

Build Quality & Surface Finishes

The 201M is cut from high-grade aluminium chosen for its combination of low mass and genuine structural integrity under sustained drivetrain load. The standard anodised finishes — silver, red, blue, gold, orange and green — provide a hard, corrosion-resistant surface layer that holds its colour well through the seasons. For riders operating in wet climates or running extended service intervals, the hard-anodised variant adds a measurably denser surface treatment that stands up to chain side-load and abrasive road contamination far better than conventional anodising.

Fitment & Compatibility

This sprocket is designed exclusively for the following models and is compatible only with 525-pitch chain:

• Yamaha YZF-R6 RJ11 (2003-2005)
• Yamaha YZF-R6 RJ15 (2006-2007)
• Yamaha YZF-R6 RJ27 (2008-2026)

Carrier bolt pattern: 110/130 — 6-bolt. Always verify your existing chain pitch before ordering; this rear sprocket is not compatible with 520 or 530 pitch chains.

Specifications