Skip to content
Your bike shop from Würzburg |  Best-price guarantee

Tap to find products

What are you looking for? Search, for example, for "SRAM" or "rear derailleur".

Fall Sale

Quality bike parts up to 79% below MSRP - discover them now

The shopping cart is empty

Continue shopping
Skip to product information

B-Ware: Neuware mit leichten Lagerspuren Das Produkt ist unbenutzt und vollständig funktionsfähig. Es können minimale Gebrauchsspuren oder leichte Kratzer an der Oberfläche vorhanden sein. Die Verpackung kann beschädigt oder ersetzt worden sein.

The ROTOR Round Rings inner chainring with 42 teeth is designed for 2x road bike drivetrains with a compatible 110 mm 4-arm mounting (BCD 110x4). Its round shape provides a consistent gear ratio throughout the crank rotation. The inner ring is intended especially for chainring combinations with 54/42 or 55/42 teeth.

Made from CNC-machined 7075-T6 aluminum, the ring can be integrated into a suitably matched 2x drivetrain. For installation, both the mounting shape and a suitable match between the outer ring and shifting system are important, in addition to the bolt circle.

The item is unused but may show slight storage or surface marks.

 

Top features at a glance:

  • 42 teeth as an inner ring: For matched 2x combinations with 54 or 55 teeth on the outer ring.
  • Round chainring shape: Consistent gear ratio throughout the crank rotation.
  • BCD 110x4: CNC-machined 7075-T6 aluminum for compatible 4-arm mountings.

 

Technical specifications:

  • Manufacturer: ROTOR
  • Model: Round Rings
  • Product type: Inner chainring
  • Intended use: Road bike / road
  • Drivetrain: 2x
  • Speeds: 2x10-speed / 2x11-speed
  • Number of teeth: 42 teeth
  • Chainring combinations: 54/42 and 55/42 teeth
  • Bolt circle / mounting: BCD 110x4 mm (4-arm)
  • Position: Inner
  • Shape: Round
  • Material: 7075-T6 aluminum
  • Manufacturing: CNC-machined
  • Color: Black

 

Compatible with:

  • Compatible ROTOR road cranks or spiders with a suitable BCD 110x4 mounting
  • Matched 2x10- and 2x11-speed road bike drivetrains
  • Compatible 54- or 55-tooth outer chainrings for 54/42 or 55/42 combinations

Before purchasing, please check the exact 4-arm mounting and intended chainring combination; the same bolt circle diameter alone does not guarantee compatibility.

 

Included:

  • 1 × ROTOR Round Rings inner chainring, 42 teeth, Black
  • Outer chainring, crankset, and mounting bolts are not specified as included.
  • Delivered in workshop packaging - securely packaged, without original packaging

 

Manufacturer part number: C01-516-19010-0 | EAN: 8434366016030

For assembling a suitable 2-chainring road bike crankset with a 42-tooth inner chainring.

ROTOR

SKU: L3F4

ROTOR Round Rings inner chainring 42 teeth | BCD 110x4 mm | 54/42 / 55/42 | 2x10-11-speed (B-stock)

  • CNC-gefrästes 7075-T6-Aluminium | BCD 110x4 mm
  • Rundes 42T-Innenblatt für 54/42 und 55/42
  • B-Ware: Neuware mit leichten Lagerspuren
19,00 €
incl. VAT. · Shipping
PayPal
Only 1 item left in stock
Shipping via DHL
2-year EU legal warranty
Workshop packaging   ·  Shipping without original packaging

B-Ware: Neuware mit leichten Lagerspuren Das Produkt ist unbenutzt und vollständig funktionsfähig. Es können minimale Gebrauchsspuren oder leichte Kratzer an der Oberfläche vorhanden sein. Die Verpackung kann beschädigt oder ersetzt worden sein.

The ROTOR Round Rings inner chainring with 42 teeth is designed for 2x road bike drivetrains with a compatible 110 mm 4-arm mounting (BCD 110x4). Its round shape provides a consistent gear ratio throughout the crank rotation. The inner ring is intended especially for chainring combinations with 54/42 or 55/42 teeth.

Made from CNC-machined 7075-T6 aluminum, the ring can be integrated into a suitably matched 2x drivetrain. For installation, both the mounting shape and a suitable match between the outer ring and shifting system are important, in addition to the bolt circle.

The item is unused but may show slight storage or surface marks.

 

Top features at a glance:

  • 42 teeth as an inner ring: For matched 2x combinations with 54 or 55 teeth on the outer ring.
  • Round chainring shape: Consistent gear ratio throughout the crank rotation.
  • BCD 110x4: CNC-machined 7075-T6 aluminum for compatible 4-arm mountings.

 

Technical specifications:

  • Manufacturer: ROTOR
  • Model: Round Rings
  • Product type: Inner chainring
  • Intended use: Road bike / road
  • Drivetrain: 2x
  • Speeds: 2x10-speed / 2x11-speed
  • Number of teeth: 42 teeth
  • Chainring combinations: 54/42 and 55/42 teeth
  • Bolt circle / mounting: BCD 110x4 mm (4-arm)
  • Position: Inner
  • Shape: Round
  • Material: 7075-T6 aluminum
  • Manufacturing: CNC-machined
  • Color: Black

 

Compatible with:

  • Compatible ROTOR road cranks or spiders with a suitable BCD 110x4 mounting
  • Matched 2x10- and 2x11-speed road bike drivetrains
  • Compatible 54- or 55-tooth outer chainrings for 54/42 or 55/42 combinations

Before purchasing, please check the exact 4-arm mounting and intended chainring combination; the same bolt circle diameter alone does not guarantee compatibility.

 

Included:

  • 1 × ROTOR Round Rings inner chainring, 42 teeth, Black
  • Outer chainring, crankset, and mounting bolts are not specified as included.
  • Delivered in workshop packaging - securely packaged, without original packaging

 

Manufacturer part number: C01-516-19010-0 | EAN: 8434366016030

For assembling a suitable 2-chainring road bike crankset with a 42-tooth inner chainring.

Bike Parts. Fast. Fair.

✔ ⭐ 4.9 Trustpilot rating
✔ 🚚 Fast shipping from our warehouse in Würzburg
✔ 📍 Local pickup available
✔ 🔧 Help with compatibility and selection
✔ 📦 Top brands at great prices
✔ 💰 Best price guarantee

Your young team from Würzburg - focused on great prices and hassle-free service!

ROTOR Componentes Tecnológicos SL is a respected Spanish supplier known for its good reputation, innovative strength, and commitment to quality. The company is valued for its reliable service, technical expertise, and trusted presence in the cycling industry.

Manufacturer information Rotor COMPONENTES TECNOLÓGICOS SL
C / Miño 14
28864 Ajalvir – MADRID
Spain
Email: Verkaufe@Rotorbike.com Phone: +34 917 374 946 Website: https://rotorbike.com/