Brompton Oval chainrings 130bcd

Color : Black
Variant : 50TSize Guide

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absoluteBLACK Premium 1X 130/5 bcd oval chainrings designed specifically for original Brompton cranks. Perfect choice for 1X narrow wide folding bike setup. Delivered with mounting bolts for your convenience. Oval chainring helps to pedal smoother, get less tired and reduce knee pain.

Size (Mass +/-1g):

50T (89g) comes with 4 AL bolts (weight given for chainring only)




Brompton 130/5 cranks specifically.


cnc machined 7075 Txxx Aluminum. Long-lasting construction


type II anodizing


10.5% ; Timing of 112° after TDC (top dead center) - Patent Pending


Advantages of our special Brompton 1X Oval chainrings:

*Finest design to provide excellent weight to strength ratio
*One of a kind special oval shape (Patent Pending)
*Unique Patent Pending narrow-wide teeth profiles to keep your chain in place for minimum 12 months!
*Superb quality and great look.
*You will ride faster using ovals.
*Reduces stress on knees and helps to maintain your legs fresher for longer
*You will not "feel" the oval shape at all

How to mount Brompton 1X 130/5 Oval chainring:

First you need to remove crank from the bike. Once removed, unscrew 5 bolts that hold original chainring. Position absoluteBLACK oval chainring from behind the crank in the way that 4 protrusions on the chainring holes fit directly into the crank tabs. Please note one hole is bigger than the others - this one needs to sit directly behind the crank arm and original bolt should be used to secure it. Use 4 provided AB bolts to lock the chainring in place using T-30 torx key with force of about 5-7Nm. Mount your crank back to the bike. Done

Always use a new chain with a new chainring.

Designed in UK. Manufactured in Poland (EU).

The World's finest oval (elliptical) road chainring. Non circular chainrings, Non-round chainrings. Asymmetrical chainrings.

Share your Oval chainring photos with us on Instagram: #OvalThis #absoluteBLACK #OVALREVOLUTION