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VBC is an acronym for Variable Bolt Circle. The beauty of VBC rings is they allow you to set up various tooth configurations to get the gear ratio you desire.
The outer ring is designed with a slotted section and the inner five bolt ring is self centering allowing more options when compared to traditional crank designs with set bolt circle requirements. We recommend at least a ten tooth difference between the outer gear and the inner gear, the maximum is 22 teeth.
Inner ring: 24- 38 even increments Outer ring: 38-52 even increments
Compatibility:
VBC 30 chainrings: M/A/R/G 30 cranks.
VBC 17 chainring: ENO/Road Square Taper cranks.
Compatiible to 9 10 and 11 speed drivetrains.
Shimano derailleurs recommended.
Outer chainrings can not be used without inner chainring. They are not stiff enough by themselves.
