Sitta Aluminium Rear Sprocket BMW S1000RR K46 (2009-2018) 202Y – 37-47 Teeth, 520 Pitch

Forged from high-grade aluminium and finished in eight anodised colours, the Sitta 202Y rear sprocket is the definitive upgrade for BMW S1000RR, S1000XR and S1000R riders who refuse to compromise on either aesthetics or outright performance. Eleven tooth counts spanning 37 to 47 teeth let you dial in your gearing precisely, whether you are chasing lap times at a circuit or demanding everyday reliability on the road.

Key Features

• Premium aluminium construction keeps weight to just 350 g (size 45), reducing unsprung mass for sharper throttle response and more agile handling.
• 520 pitch specification optimises the sprocket for performance and racing applications where every gram and every watt of drivetrain efficiency counts.
• Eleven tooth options from 37 to 47 teeth give you granular control over your final-drive ratio to suit any track layout or riding style.
• Available in eight anodised finishes — silver, black, hard-anodised, red, blue, orange, gold and green — so the sprocket becomes a visual statement as well as a functional upgrade.
• Hard-anodised option delivers a surface treatment measurably more durable than standard anodising, resisting wear and corrosion under sustained high-load use.
• Sprocket carrier pattern 110/131 – 5-hole ensures precise, fuss-free fitment with no modification required.

Design, Finish and Heritage

Sitta has built its reputation over decades by supplying drivetrain components to both privateer racers and factory-supported teams across Europe. The 202Y rear sprocket reflects that heritage: the tooth profile is CNC-machined to exacting tolerances, producing a surface finish that mates cleanly with a 520-pitch chain from the first link. Each colour variant is anodised rather than painted, meaning the finish penetrates the aluminium rather than sitting on top of it — it will not chip, flake or fade the way a lacquer can. The hard-anodised option takes this further still, producing a surface hardness that stands up to the abrasive conditions of repeated track days without demanding early replacement.

The eight colour choices are not an afterthought. Whether you are building a race-replica livery around your S1000RR's M Motorsport bodywork or simply want a subtle silver or black sprocket that disappears into the drivetrain, the range covers every taste. This is the kind of detail-level attention to finish that separates a true performance component from a generic replacement part.

Gearing Strategy

Selecting the correct tooth count is one of the simplest and most cost-effective tuning decisions available to a BMW S-series rider. The Sitta 202Y makes that choice accessible across a wide spectrum:

• Smaller counts (37-42 teeth) reduce the final-drive ratio, raising top speed and lowering engine revs at motorway cruising speeds — ideal for high-speed circuits or long-distance road riding.
• Larger counts (43-47 teeth) increase the final-drive ratio, sharpening acceleration out of slow corners and making the bike feel more agile and responsive — the preferred choice for tight, technical track layouts or spirited back-road riding.

Because the 202Y is available across all eleven counts in a single quality tier, you can experiment with different ratios without investing in a new sprocket at each step.

Fitment and Compatibility

The Sitta 202Y is engineered exclusively for 520-pitch chains and fits the following BMW models:

• BMW S1000RR K46 (model years 2009 – 2018)
• BMW S1000XR (model years 2015 – 2018)
• BMW S1000R (model years 2014 – 2018)

Sprocket carrier pattern: 110/131 – 5-hole. Confirm your chain pitch before ordering; this sprocket is compatible with 520 pitch only.

Specifications