ProForm Degree Wheel 9-inch Precision Timing Wheel — High-Contrast Scale & Instructions

ProForm 66791 Degree Wheel is a 9-inch precision timing wheel designed to find top dead center and verify camshaft timing on engines accurately.

Whether you're rebuilding an engine, setting valve timing, or verifying ignition timing, the ProForm 66791 Degree Wheel gives a clear, durable reference for rotational measurements. The nine-inch diameter balances readability with compact handling, while printed graduations and supplied instructions make it practical for both hobbyists and professional mechanics.

How does the degree wheel help me locate top dead center?

The wheel mounts to the crank or harmonic balancer and provides a large, easily read angular scale so you can rotate the crankshaft precisely to 0° (TDC) or any specified degree. This method improves accuracy compared with guesswork or relying solely on timing marks.

• Attach using the vehicle-appropriate fastener or adapter.
• Rotate crank slowly while watching the pointer or dial indicator.
• Confirm 0° alignment with piston stop or dial indicator readings.

Can I use this to check and set camshaft timing?

Yes — the wheel lets you measure crankshaft degrees and compare them to camshaft lobe positions or degree specs, helping you set cam timing during installation or verify timing after changes. It’s especially useful for degreeing performance cams or confirming timing belt/chain alignment.

• Lock crank at specified degree marks to read cam lobe position.
• Use the wheel with a dial indicator for repeatable accuracy.
• Adjust sprockets or chain position until specs match.

What features make this 9" wheel practical in the shop?

The ProForm 9" wheel combines a readable scale with robust construction and clear instructions so you spend less time interpreting marks and more time working. Its size is large enough for visibility but compact enough for engine bays where space is limited.

• Nine-inch diameter for clear graduations at a glance.
• High-contrast markings that resist shop grime and handling.
• Includes step-by-step guidance for common degreeing procedures.

How do I use the included instructions to speed setup?

The accompanying step-by-step directions outline mounting, zeroing, and reading the wheel so beginners can follow a repeatable process and experienced users can avoid common pitfalls. The instructions focus on safety and measurement consistency rather than engine-specific procedures.

• Guidance on safe mounting and securing of the wheel.
• Procedures for finding TDC and verifying repeatability.
• Tips for combining wheel use with dial indicators and piston stops.

Who is this for? The ProForm 66791 Degree Wheel is aimed at automotive technicians, performance tuners, engine builders, and DIY mechanics who need a reliable, easy-to-read tool for timing and degreeing tasks. It’s suited to anyone who wants to confirm top dead center, verify cam timing after installation or maintenance, or perform precise timing checks during engine assembly. If you work on engines regularly or are upgrading cam components and want repeatable angular measurements, this compact 9" wheel offers a straightforward, shop-ready solution.