How do you measure the sprocket bolt pattern on a final drive?

Expert Answer

To measure a sprocket bolt pattern on a final drive, count the number of sprocket mounting bolts and measure the bolt circle diameter (BCD), not the outside edge of the sprocket. A common method is to measure center-to-center between two opposite bolt holes, or measure across adjacent holes and use the correct bolt-circle formula if the pattern has an odd number of bolts. Also confirm the bolt size, hub pilot diameter, spline or mounting interface, and whether the sprocket is a bolt-on type or part of a hub assembly. If you are replacing the complete drive, VANROCK Drives sells brand-new OEM-specification final drive and travel motor assemblies online at vanrockdrives.com, shipped fully assembled, filled with oil, with free express shipping, duties included, and a Limited Lifetime Warranty. We are an independent supplier and are not affiliated with any OEM brand.

Answered by VANROCK specialists · Published 8/8/2026