• Stepped design: 3/4-inch inner OD (1.5-inch bearing surface) to 5/8-inch outer (1.125-inch surface).
• 3/16-inch step for smooth transitions in wheel assemblies.
• Primarily for right-hand oval, also suits both sides in four-cycle sprints.

This innovative PM-89B Spindle Shaft provides versatility for racers tackling varied track types, ensuring proper bearing seating that reduces friction and heat buildup. The stepped profile allows for larger inner bearings, improving load distribution and cornering poise—key for maintaining momentum in right turns.

In oval racing, it excels by supporting aggressive banking without compromising alignment. For four-cycle karts, the dual sizing accommodates heavier setups, delivering responsive steering that helps navigate tight sections swiftly. Overall 4.75-inch length fits standard weldments, making upgrades simple.

Experience the difference in track feel: tighter lines, less wander, and faster recovery from apexes. It's a staple for competitive teams seeking adaptability without sacrificing durability. SKU PM-89B elevates your front-end game.

Frequently Asked Questions

Q: What is the benefit of the stepped design on this spindle shaft?

A: The stepped design allows for the use of larger inner bearings, which improves load distribution and cornering poise. This helps reduce friction and heat buildup, leading to more consistent handling through the apex.

Q: Is this spindle shaft compatible with both oval and sprint karts?

A: Yes, the PM-89B is primarily designed for right-hand oval racing but is also perfectly suited for use on both sides of four-cycle sprint karts, providing excellent versatility for different track types.

Q: What are the specific dimensions of the stepped surfaces?

A: The shaft features a 3/4-inch inner OD with a 1.5-inch bearing surface, stepping down to a 5/8-inch outer OD with a 1.125-inch surface. The total length is 4.75 inches, making it compatible with standard weldments.

Q: How does this shaft improve steering performance?

A: By providing a more stable bearing seat, this shaft reduces front-end "wander" and allows for tighter lines. It is engineered to support aggressive banking in oval racing and provides responsive steering for navigating tight sections in sprint racing.

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