Sitta Aluminium Rear Sprocket BMW S1000RR K46 (2009-2018) 202Y – 37-47 Teeth, 525 Pitch

Precision-machined from high-grade aluminium, the Sitta 202Y rear sprocket delivers a confidence-inspiring combination of low unsprung weight, dependable power transfer and all-day riding comfort on the BMW S1000RR K46. Whether you are threading through morning traffic or pushing hard through a long-distance touring stint, the secure fitment and smooth chain engagement mean you simply forget the drivetrain is there — exactly as it should be.

Key Features

• High-grade aluminium construction keeps rotating mass to a minimum, sharpening throttle response and reducing drivetrain vibration felt through the footpegs and seat
• 525 pitch compatibility, precision-cut to 37 through 47 teeth, lets you fine-tune gearing to match your riding style — a smaller sprocket for relaxed cruising and effortless motorway miles, a larger one for snappier acceleration and more agile handling
• Carrier interface of 110 mm x 131 mm with a 5-bolt pattern ensures a secure, rattle-free seat on the original sprocket carrier with no modifications required
• Available in eight finishes: silver, black, hard-anodised, red, blue, orange, gold and green — the hard-anodised option offering measurably greater surface hardness and wear resistance than standard anodising
• Direct OEM replacement fitment engineered for the K46 chassis across all model years 2009 to 2018

Gearing: Choosing the Right Tooth Count

Rear sprocket tooth count has a direct and immediately noticeable effect on how the S1000RR feels under power. Understanding the trade-off lets you build a drivetrain that genuinely suits how you ride.

A smaller rear sprocket (37 to 42 teeth) lowers engine revs at any given road speed, easing the workload on long runs and nudging the bike's character towards a more relaxed, mile-eating feel without blunting outright performance. A larger rear sprocket (43 to 47 teeth) shortens the overall gearing ratio, sharpening initial acceleration out of corners and giving the bike a more aggressive, responsive feel — the preferred choice for track days and technical roads where momentum changes are constant.

With eleven tooth counts available in the Sitta 202Y range, you can step the gearing in single-tooth increments until the bike responds exactly as you want it to, without any compromise on fitment or chain alignment.

Build Quality and Durability

Sitta machines the 202Y from aerospace-grade aluminium alloy, achieving the strength-to-weight ratio that performance riders demand. The anodised surface treatments — particularly the hard-anodised option — add a dense oxide layer that resists the abrasion generated by chain side-loads and the grit thrown up during real-world riding. The result is a sprocket that maintains its tooth profile and carrier register far longer than cheaper alternatives, protecting your chain investment at the same time.

The 5-bolt carrier interface distributes load evenly around the full hub diameter, eliminating the stress concentrations that contribute to premature carrier wear. Every hole is machined to close tolerances so that fitting is straightforward and torquing the bolts to specification produces the same feel every time — no oval holes, no rework required.

Fitment and Compatibility

The Sitta 202Y rear sprocket is designed exclusively for the following motorcycle:

• BMW S1000RR K46 — model years 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 and 2018
• Compatible with 525 pitch chain only
• Carrier bolt pattern: 110 mm x 131 mm, 5-hole

Always verify your existing chain pitch before ordering. If you are upgrading from the original 525 chain, the 202Y slots directly into place using your existing sprocket carrier and standard hardware.

Specifications