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Hi, Nate Taylor here. Please reach out to me at nate@sscycleworks.com for inquiries on parts availabilities and shipping estimates.

68 mm Bolt Circle Diameter, 4-bolt chainrings - None currently in stock

68 Bolt Circle Diameter (BCD) 4-bolt chainrings on this page: None currently in stock

Bolt Circle Diameter is the diameter of the circle formed by the centers of the chainring fixing bolts. With 4-bolt cranksets, this is easy to measure. 5-bolt cranks are more difficult.

If you are unsure about what size chainring you need, Wolf Tooth Components has an excellent guide to measuring your rings.