Information

Discontinued as of April 22, 2025

Remaining stock of v1 VBC 2x inner and outer chainrings will be available on our website until we run out.  So what do you do when you can’t get v1 VBC 2x chainrings anymore?  Just get a v2 VBC 2x chainring set; they’ll work with whatever set up you already have.

v1 VBC (Variable Bolt Circle) 2x outer chainrings and will fit either style of v1 VBC 2x Inner Chainrings: for the MR30 cranks or ENO/Square Taper Road cranks.  v1 VBC 2x “sets” are no longer available and have been superseded by the “v2 VBC 2x Chainring Sets” which add 12-speed compatibility.  If you want a v1 VBC 2x “set” you will have to build it yourself by purchasing the parts separately:

• v1 VBC 2x Inner Chainring (on the Chainring page)
• v1 VBC 2x Outer Chainring (on the Chainring page)
• v1 VBC 2x Chainring Hardware Set (on the Chainring page)

These are the outer v1 VBC (Variable Bolt Circle) 2x Outer Chainrings that mount directly to the crank arm.   They come in two versions to fit either MR30 cranks or ENO/Square Taper Road cranks.  Both styles are compatible with our v1 VBC 2x Inner Chainrings.

Features

• Compatible with White Industries cranks only
• Chainrings are made from  U.S. sourced 7075-T6 aluminum (except 48t-52t which are 6061-T6)
• Available in black anodize only
• Available to fit either MR30 cranks (30mm) or ENO/Road Square Taper cranks (17mm)
  • The outer rings are specific to which style of crank you have, i.e., 30mm or 17mm
    • Each crank uses a different spline configuration for the outer ring
• v1 VBC 2x Inner Chainrings are the same for either crank style
• Hardware available separately (see Chainrings>v1 VBC 2x Chainring Hardware Set)
• Outer v1 VBC 2x chainrings cannot be used without an inner chainring
  • Outer are not stiff enough by themselves
  • They need the inner ring mounted to stiffen the whole assembly

Specs

• v1 VBC 2x Chainrings are engraved with “Inside”, which should face toward the frame
  • 24T inner is not engraved and the wider/deeper tooth “shelf” should face toward the frame
• Compatible with 9, 10, and 11 speed drivetrains only
  • 12 speed chains are too narrow and will fall/jam between the rings
• We recommend Shimano front derailleurs only for best shifting performance
•  To ensure proper shifting we recommended inner/outer chainring combinations of:
  • A difference no smaller than 10 teeth
  • A difference no bigger than 20 teeth
• Inner chainrings are available from 24t to 38t in 2 teeth increments
• Outer chainrings are available from 38t to 52t in 2 teeth increments

Torque

• VBC bolts: 7 ft lbs (10 Nm)

Tech Docs

• VBC v2 Chainring Assembly Instructions
• VBC v1 and v2 Chainring and and Hardware Identification Guide