1.25 OFFSET INSRT2.5 DIAPULLEY MFG# PP-IS-4
Source: Custom Chrome
To permit custom motorcycle builders the freedom to offset the transmission by allowing the use of wider rear wheel/tire assemblies, the following offset inserts are available for Primo front pulleys. Special nuts and flanges (outside guide) are required. The 2.5" inserts fit Brute III front pulleys, the 3.5" inserts fit Brute IV pulleys.