Chain & Sprockets
- Made from case hardened steel for durability at the countershaft position
- Lightened with radial holes to reduce rotating mass
- 520 chain pitch — requires full 520 chain and sprocket conversion from stock 525 setup
- Zinc/black finish
Specs
- Manufacturer: Driven Racing
- Part Number: 1190-520-17T
- Distributor SKU: 1212-0918
- Type: Countershaft
- Material: Steel
- Finish: Zinc / Black
- Tooth Count: 17
- Chain Size: 520
- Mounting Position: Front
- Units: Each
Replaces OEM Part Numbers
No OEM replacement data provided.
Fitment
Main Fitment
Year(s) — Make / Model — OEM Gearing — OEM Chain
| 2009–2014 | BMW S1000RR | 17T / 44T | 525 — 118 links |
| 2015–2018 | BMW S1000RR | 17T / 45T | 525 — 120 links |
| 2019–2026 | BMW S1000RR | 17T / 45T | 525 — 120 links |
| 2014–2022 | BMW S1000R | 17T / 45T | 525 — 118 links |
Why Convert to 520 From the Stock 525?
Both the S1000RR and S1000R run 525 chain from the factory — a heavier, wider chain pitch designed with longevity and durability as the priority. Converting to a 520 setup reduces the overall weight of the drivetrain by using a narrower, lighter chain and matched sprockets.
The weight reduction is real, but it is worth setting honest expectations. The biggest benefit is felt by riders doing track days or aggressive street riding where rotating mass and drivetrain response are more noticeable. For a rider doing mostly casual street miles, the difference between a well maintained 525 setup and a 520 conversion is subtle and may not be physically felt at all.
The tradeoff is lifespan. A 520 chain is narrower and lighter than stock, which means it is working with less material. A quality 520 chain maintained properly will last well, but it will generally not outlast a stock 525 chain under the same conditions. Riders putting high street mileage on their bike should factor that in.
The bottom line — if you are doing track days or aggressive riding and want a lighter, more responsive drivetrain, the 520 conversion is a worthwhile upgrade. If you are primarily a street commuter or touring rider, the stock 525 setup is the more practical choice for long term cost and durability.
Gearing — Staying Stock or Making a Change
This sprocket is 17 teeth, which matches the stock front sprocket size on both bikes. Running this sprocket with a stock size rear sprocket keeps your gearing identical to OEM — the only change is the chain pitch conversion itself.
If you want to use the conversion as an opportunity to adjust your gearing, here is what tooth count changes actually do in practical terms:
Going one tooth smaller on the front (16T) shortens your gearing — the bike accelerates harder through each gear, the engine revs higher at any given speed, and top speed is reduced. The effect is roughly equivalent to adding approximately two to three teeth to the rear sprocket. This is one of the most popular gearing changes on both the S1000RR and S1000R — many riders prefer the more aggressive feel it provides on the street and especially on track.
Going one tooth larger on the front (18T) lengthens your gearing — the bike revs lower at cruising speeds and acceleration from a stop is slightly softer. Riders focused on top speed or extended highway miles occasionally run this setup.
Neither change is right or wrong — it depends entirely on how and where you ride. Stock gearing is well matched for most street use on these bikes.
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IMPORTANT: Please Review Your Owner’s Manual for Exact Amounts or Sizing of This Product!
Speak to one of our experts today:
469-490-3577
Driven Racing
SKU:1212-0918
Description:Driven Racing 17 Tooth EVO TECH Front Sprocket — 520
Product Overview
This is a 17-tooth front (countershaft) sprocket from Driven Racing’s EVO TECH line, designed for BMW S1000RR and S1000R models. Both bikes run 525 chain stock from the factory. Installing this sprocket requires converting to a full 520 chain and sprocket setup. The sprocket carries a zinc/black finish.
Key Technology & Design
- Made from case hardened steel for durability at the countershaft position
- Lightened with radial holes to reduce rotating mass
- 520 chain pitch — requires full 520 chain and sprocket conversion from stock 525 setup
- Zinc/black finish
Specs
- Manufacturer: Driven Racing
- Part Number: 1190-520-17T
- Distributor SKU: 1212-0918
- Type: Countershaft
- Material: Steel
- Finish: Zinc / Black
- Tooth Count: 17
- Chain Size: 520
- Mounting Position: Front
- Units: Each
Replaces OEM Part Numbers
No OEM replacement data provided.
Fitment
Main Fitment
Year(s) — Make / Model — OEM Gearing — OEM Chain
| 2009–2014 | BMW S1000RR | 17T / 44T | 525 — 118 links |
| 2015–2018 | BMW S1000RR | 17T / 45T | 525 — 120 links |
| 2019–2026 | BMW S1000RR | 17T / 45T | 525 — 120 links |
| 2014–2022 | BMW S1000R | 17T / 45T | 525 — 118 links |
Why Convert to 520 From the Stock 525?
Both the S1000RR and S1000R run 525 chain from the factory — a heavier, wider chain pitch designed with longevity and durability as the priority. Converting to a 520 setup reduces the overall weight of the drivetrain by using a narrower, lighter chain and matched sprockets.
The weight reduction is real, but it is worth setting honest expectations. The biggest benefit is felt by riders doing track days or aggressive street riding where rotating mass and drivetrain response are more noticeable. For a rider doing mostly casual street miles, the difference between a well maintained 525 setup and a 520 conversion is subtle and may not be physically felt at all.
The tradeoff is lifespan. A 520 chain is narrower and lighter than stock, which means it is working with less material. A quality 520 chain maintained properly will last well, but it will generally not outlast a stock 525 chain under the same conditions. Riders putting high street mileage on their bike should factor that in.
The bottom line — if you are doing track days or aggressive riding and want a lighter, more responsive drivetrain, the 520 conversion is a worthwhile upgrade. If you are primarily a street commuter or touring rider, the stock 525 setup is the more practical choice for long term cost and durability.
Gearing — Staying Stock or Making a Change
This sprocket is 17 teeth, which matches the stock front sprocket size on both bikes. Running this sprocket with a stock size rear sprocket keeps your gearing identical to OEM — the only change is the chain pitch conversion itself.
If you want to use the conversion as an opportunity to adjust your gearing, here is what tooth count changes actually do in practical terms:
Going one tooth smaller on the front (16T) shortens your gearing — the bike accelerates harder through each gear, the engine revs higher at any given speed, and top speed is reduced. The effect is roughly equivalent to adding approximately two to three teeth to the rear sprocket. This is one of the most popular gearing changes on both the S1000RR and S1000R — many riders prefer the more aggressive feel it provides on the street and especially on track.
Going one tooth larger on the front (18T) lengthens your gearing — the bike revs lower at cruising speeds and acceleration from a stop is slightly softer. Riders focused on top speed or extended highway miles occasionally run this setup.
Neither change is right or wrong — it depends entirely on how and where you ride. Stock gearing is well matched for most street use on these bikes.
