absoluteBLACK OVAL Brompton 1X 130/5 BCD Chainring
Product Description
absoluteBLACK Brompton Oval 1x Chainring – oval narrow-wide chainring for Brompton cranksets
The absoluteBLACK Brompton Oval chainring is specifically designed for original Brompton cranksets with a 130 mm bolt circle diameter and 5-arm mounting. Its oval shape promotes smoother pedalling and is designed to help reduce knee strain, making it an excellent upgrade for riders looking to improve comfort and pedalling efficiency on their Brompton folding bike.
The unique 10.5% ovality is optimised for natural power delivery throughout the pedal stroke. Its narrow-wide tooth profile provides reliable chain retention for 1x drivetrains. CNC-machined from 7075 aluminium and finished with durable Type II anodising, the chainring combines low weight with long-lasting performance.
Product Specifications:
- Mounting:
- 130 mm
- Design:
- Oval
- Material:
- aluminium (7075)
- Speeds cassette:
- 1-speed, 12-speed, 6-speed
- Type:
- Oval
black | 50 | 50:
- Teeth:
- 50
- Crank speed:
- Single-speed
Technical Information:
black | 50 | 50:
- Gear Ratio Crank:
- 50
Product Features:
• Bolt circle diameter: 130 mm / 5-arm mounting
• Tooth count: 50 teeth
• Ovality: 10.5%
• Oval timing: 112° after top dead centre
• Narrow-wide tooth profile for reliable chain retention
• Promotes smooth pedalling and efficient power transfer
• CNC-machined 7075 aluminium
• Durable Type II anodised finish
• Not compatible with SRAM Flattop or Shimano HG+ chains
• Weight according to the manufacturer: 89 g (excluding mounting bolts)
• Designed in the UK, manufactured in Poland
Manufacturer Number:
- black | 50 | 50: ROVBROM50BK
Contents:
• 1 x absoluteBLACK Brompton Oval 1x chainring 50T
• 4 x aluminium chainring bolts
Weight:
- black | 50 | 50: 89 g
Manufacturer:
Carrer de l’Aigueta 19 1-3
AD500 Andorra la Vella
ANDORRA
info@absoluteblack.cc
Distributor:
Carlo-Schmid-Straße 12
52146 Würselen
Germany
info@bike-components.de
