TreadCompass

Fiat X-1/9 Lug Nut Torque

The 1974–1983 Fiat X-1/9 lug nut torque is 65 ft-lbs (88 N·m).

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Fiat X-1/9 · 1974–1983

Lug nut torque
65ft-lbs88 N·m
Same spec for every year 1974–1983.
  • ✓ Tighten in a star pattern, in two passes, with a torque wrench (not an impact gun)
  • ✓ Re-check the torque after the first 50–100 miles
  • ✓ Confirm against your owner’s manual; aftermarket wheels can differ

Source: TreadCompass vehicle fitment database. Page updated November 2026. Specs can vary with aftermarket wheels and lug hardware, so always confirm with your owner’s manual.

Factory tire sizes for the Fiat X-1/9

Compare prices across retailers for your size.

145/80R131974–1978 · Compare prices →165/70R131979–1983 · Compare prices →

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Fiat X-1/9 lug nut torque FAQ

What is the lug nut torque for a Fiat X-1/9?

The 1974–1983 Fiat X-1/9 lug nut torque is 65 ft-lbs (88 N·m). Tighten in a star pattern with a torque wrench, then re-check after the first 50–100 miles.

Do all X-1/9 trims use the same lug nut torque?

Yes. Every X-1/9 trim in our database uses the same lug nut torque for a given model year.

Has the Fiat X-1/9 lug nut torque changed over the years?

No. It has been 65 ft-lbs (88 N·m) for every model year we have, 1974–1983.

What size tires come on the Fiat X-1/9?

Factory tire sizes include 145/80R13 (1974–1978) and 165/70R13 (1979–1983). Check the sidewall of your current tires to confirm yours, then compare prices for that size above.

New to torquing wheels? See how to torque lug nuts and common questions.