How reliable is this fitment answer?

Confidence: Reported (2 of 3). Stated by one reasonably reputable source (retailer, shop, magazine). Not independently confirmed. Based on 4 cited source(s), last verified 2026-10-26.

What is the factory spec for the Factory wheel nut spec, Evo VIII/IX (M12x1.5) on a Mitsubishi Lancer Evolution VIII (2003-2005)?

Q: What is the factory spec for the Factory wheel nut spec, Evo VIII/IX (M12x1.5) on a Mitsubishi Lancer Evolution VIII (2003-2005)?

Factory specification. Wheel nuts are M12x1.5 (a retailer and owners) and the 2003 US service manual sets them at 98 ± 10 N·m (73 ± 7 ft-lb). The manual read does not give the thread or the seat, so the row is tier 2. One owner fitting MR wheels to another car found they appear to need flat-seat nuts rather than tapered ones, and a retailer warns that most aftermarket nuts are not meant for the stock wheels. Use OEM-type nuts on factory wheels.

Added 2026-10-26 · Updated 2026-10-26

Short answer: Factory specification Reported

Verdict:Factory spec Reported confidence (2 of 3) · 4 sources

Factory specification: Wheel nuts are M12x1.5 (a retailer and owners) and the 2003 US service manual sets them at 98 ± 10 N·m (73 ± 7 ft-lb).

Years: 2003-2005 · Applies to: all · 4 sources · Last verified 2026-10-26

Safety-critical part. Manufacturer sources are cited, but they disagree or are incomplete for this fitment, so this entry is held below "Confirmed". Have the work done or checked by a qualified professional and confirm figures and part numbers against the service manual or the manufacturer.

Part	Factory wheel nut spec, Evo VIII/IX (M12x1.5)
Vehicle	Mitsubishi Lancer Evolution VIII (2003-2005)
Years	2003-2005
Trim / condition	all
Verdict	Factory spec Specification
Confidence	Reported 2 of 3 — Stated by one reasonably reputable source (retailer, shop, magazine). Not independently confirmed.
Last verified	2026-10-26 (date the cited sources were last read)

Details

Wheel nuts are M12x1.5 (a retailer and owners) and the 2003 US service manual sets them at 98 ± 10 N·m (73 ± 7 ft-lb). The manual read does not give the thread or the seat, so the row is tier 2. One owner fitting MR wheels to another car found they appear to need flat-seat nuts rather than tapered ones, and a retailer warns that most aftermarket nuts are not meant for the stock wheels. Use OEM-type nuts on factory wheels.

Specs

thread: M12x1.5
torque: 98 ± 10 N·m (73 ± 7 ft-lb)
hex mm owner reported: 21

Other wheels fitment for the CT9A (Evolution VIII)

OEM Evo VIII (2003-05 base/RS/VIII) Enkei 17x8 ET38 wheel — Specification Factory spec
OEM Evo VIII MR (2005) BBS forged 17x8 ET38 wheel — Specification Factory spec
Factory spare, Evo VIII 2003 (17x4T steel ET30, T125/70D17) — Specification Factory spec
OEM Evo IX (2006 RS/IX) Enkei 17x8 ET38 wheel — Reported to fit Fits
OEM Evo IX MR (2006) BBS forged 17x8 ET38 wheel — Reported to fit Fits

This part on other generations

Mitsubishi Lancer Evolution IX (2006) — Specification Factory spec

More for this car

All Mitsubishi Lancer Evolution VIII (2003-2005) fitment answers · CT9A (Evolution VIII) common problems
Newsletter archive: past issues with every new and corrected entry

Sources

2003 Lancer Evolution service manual, group 31: wheel and tire — Mitsubishi Motors Corporation (mfr spec; read 2026-10-26; full page read)
Wheel nut 98 ± 10 N·m (73 ± 7 ft-lb).
Evo 7 8 9 lug nuts and locks — STM Tuned (retailer feed; read 2026-10-26; full page read)
2001-2006 Evolution VII-IX use M12x1.5 nuts; most aftermarket nuts not for stock wheels.
Which lug nuts and valve stem — EvolutionM forum (forum thread; read 2026-10-26; full page read)
Owner: MR wheels appear to take flat-seat nuts, not tapered.
Lug nut spec on evo 9 — EvolutionM forum (forum thread; read 2026-10-26; full page read)
Owners: 21 mm hex, M12x1.50; 73 ± 7 ft-lb per the service manual.

Summaries are in our own words. Fitment is not guaranteed — disclaimer.

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