Rally II Wheel Fit
Short answer: Rally II wheels came in 30–40 varieties — the only way to know what you have is the two-letter code at the valve stem (that’s the WHEEL code the parts book uses: rim + center + offset). A code stamped inside the rim is just the rim type; the larger center hole is a non-issue (caps fit), but offset matters.
- 1968: JC = Firebird, JA = Tempest/LeMans/GTO. Later (1971–74) Ventura II wheels have different offsets.
- 14×7 examples: JK = 1969 Firebird/Grand Prix, JM = 1970 (same, exc. Trans Am), JS = 1971, KS = 1972. The 1970 Trans Am had a special deep-dish wheel that takes no trim ring.
- Offsets here run ~4″ to 4.5″ backspacing — fine as long as you don’t go crazy on tire size. A 14×6 is limited to about a 225/60-14 (a 215/60-14 fits a bit better; a 70-series gives a taller tire).
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Content last modified: June 13, 2026 at 10:06 am
← Frequently Asked Questions
I have an opportunity to get a set of 4 JM code Rally II’s for my ’69. The first response above indicates that they are for ’70 model year Firebirds and Grand Prix’s. That code is not listed on the Pontiac Server wheel app chart and I have not found any other reference to JM wheels. Does anyone have additional information about these wheels to ensure they will work on my disc brake firebird.
Thanks….Bruce
I just bought a set of rally II JC rims the only markings on the inside rim is D with a 1or7 stamped inside the D are these factory or repop
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