Frequently Asked Questions About International RH Hub Adapters

What International truck models and years are these RH hub adapters compatible with?

These RH hub adapters are specifically designed for International trucks with the RH (Right Hand) suspension system, commonly found on ProStar, LoneStar, and newer model 9900i trucks from 2008 onwards. The adapters work with trucks that have the Meritor FF-941, FF-942, FF-943, FF-961, FF-962, FF-963, FF-966, and FF-967 front axles. Always verify your specific axle model number before ordering, as International used different hub configurations across model years.

Are special tools or professional installation required for these hub adapters?

Installation typically requires standard shop tools including a torque wrench, socket set, and hub puller. While many experienced mechanics can install these adapters in 2-3 hours per side, we recommend professional installation if you're not familiar with hub assembly work. The most critical aspects are proper torque specifications (usually 450-500 ft-lbs for hub nuts) and ensuring correct bearing preload adjustment. Improper installation can lead to premature bearing failure or wheel separation.

What's the difference between steel and aluminum hub adapters, and which should I choose?

Steel adapters are heavier (typically 15-20 lbs more per adapter) but offer maximum durability and are better suited for severe-duty applications or frequent off-road use. Aluminum adapters provide significant weight savings for improved fuel economy and are perfectly suitable for highway applications. Both materials meet DOT standards when properly manufactured. Choose steel if you prioritize absolute durability over weight, or aluminum if you're focused on fuel efficiency and primarily run highway miles.

Will these adapters affect my truck's wheel offset or require different wheels?

RH hub adapters typically add 2.5 to 3 inches to your wheel offset, pushing the wheels further out from the hub. This means you'll need wheels with the correct offset to maintain proper clearance and avoid tire rubbing. Most customers switching to hub-piloted wheels need wheels with a +0 to -1 inch offset to compensate. Always check clearance between your tires and fenders, frame rails, and suspension components after installation. Some states have regulations about how far wheels can extend beyond fenders.

How do I know if my current studs will work with these adapters, or if I need new ones?

Most RH hub adapters require longer wheel studs than your original equipment, typically M22 x 1.5 studs that are 5 to 6 inches in length. The general rule is that you need at least 1.5 times the thread diameter of engagement (about 1.25 inches for M22 studs) extending beyond the wheel mounting surface. If your existing studs don't provide adequate thread engagement with the adapter installed, you must replace them with longer studs. Many adapter kits include new studs, but verify this before ordering to avoid installation delays.