Car TyresMichelin

Primacy 4ST

Recommended: Michelin Primacy 4ST. Ultra-silent luxury acoustic comfort with class-leading wet braking safety. Fully compatible with Ferrari 12Cilindri (275/35 R21).

FITMENT SUMMARYFerrari 12Cilindri, Ferrari 12Cilindri Spider, Aston Martin DB12, Aston Martin Vanquish

AVAILABLE SIZES

165/80 R14 185/65 R15 195/55 R16 +50 more

View full specifications

TECH SPECS & MANUFACTURING TOLERANCES

Detailed Parameters

Precision factory engineering parameters, carcass ply architecture, and certified load-speed performance ratings.

Geometry & Dimension Telemetry

FORM FACTOR: 275/35 R21 • 103Y

Rolling Diameter

725.9 mm

Circumf: 2280 mm

Revolutions / KM

~439

Odometer Calibration

MAX LOAD SPECIFICATION

Load Index Rating

103(875 kg / tyre)

Total 4-wheel gross load tolerance of 3,500 kg. Provides structural headroom for passengers and cargo.

CERTIFIED LOAD RESERVE875 KG SPEC

HIGH-SPEED CERTIFICATION

Speed Rating Symbol

Y(300 km/h)

Supercar & Track Grade Spec. Certified for sustained high-speed expressway travel without centrifugal belt delamination or carcass heat fatigue.

CERTIFIED VELOCITY300 km/h

CARCASS ARCHITECTURE

Radial (Tubeless Build)

Tubeless Radial

Acoustic MaxTouch Casing with dual high-tensile steel belts and cushioned undertread

PLY: 6-PLY RATEDSTEEL BELTED RADIAL

OEM PRESSURE SPECIFICATION

Factory Cold Inflation Pressure

32 PSI / 30 PSI(Front / Rear)

Calibrated OEM cold tyre pressure for Ferrari 12Cilindri. For full passenger/luggage payload, increase rear tyre to 33 PSI.

NITROGEN COMPATIBLE99.2% N₂ OPTIMAL

RUBBER FORMULATION

Tread Compound & Depth

7.6 mm(New Factory Tread)

Michelin FlexMax 2.0 with EverGrip self-regenerating water sipes. Built with integrated Tread Wear Indicators (TWI) calibrated at the 1.6mm legal limit.

UTQG WEAR INDEX: 380 A ATROPICALIZED

DEALER PROTECTION

Warranty & Genuine Origin

5 Years Manufacturer Warranty

100% Genuine authorized Amman Tyres stock. Certified with BIS / ISI Indian safety marks, manufactured at Michelin World-Class Facility, Chennai (Tamil Nadu) / Thailand.

ORIGIN: India / ThailandAUTHORIZED HUB

INNOVATIVE TECH

Tyre Engineering Features

✔

Silent Rib Technology eliminates high-frequency noise

Whisper-quiet highway ride quality

✔

EverGrip Technology maintains wet grip even when worn

Outstanding wet monsoon emergency braking

✔

High-density silica polymer blend for supple ride

Plush bump absorption over potholes

BENCHMARK STANDARDS

3 Reasons to Choose

High-speed highway travel and everyday city use for Ferrari 12Cilindri, Ferrari 12Cilindri Spider, Aston Martin DB12.

Recommended: Michelin Primacy 4ST. Ultra-silent luxury acoustic comfort with class-leading wet braking safety. Fully compatible with Ferrari 12Cilindri (275/35 R21).

PERFORMANCE CHARACTERISTICS & PROVING GROUND LABS

Tyre Test Metrics

Empirical proving-ground telemetry covering ISO wet braking distance, acoustic cabin decibels, high-mileage compound longevity, and lateral road adhesion.

Laboratory & Proving Ground Test Suite • Michelin Primacy 4ST

WET BRAKING (80-0 KM/H)GRADE A+

26.8METERS

Stops 5.7m shorter than standard commuter baseline under monsoon downpour conditions.

DECELERATION SAFETY INDEX88% SCORE

ROLLING RESISTANCE (RRC)ARAI GRADE A

+5%FUEL SAVINGS

Rolling resistance of 7.2 kg/t. Michelin FlexMax 2.0 with EverGrip self-regenerating water sipes minimizes heat drag during highway cruising.

FUEL CONSERVATION BOOST+5% REAL-WORLD

PROJECTED TREAD LIFEHIGH MILEAGE

75,000KM LIFE

The global benchmark for silent luxury ride comfort and shortest wet stopping distance.

UTQG TREADWEAR INDEX380 A A

ACOUSTIC CABIN NOISEWHISPER QUIET

66.4dB PASS-BY

2nd Gen Silent Rib technology eliminates air pumping noise inside the tread grooves.

CABIN SILENCE RATINGEXCELLENT (SUB-68dB)

DRY SLALOM & CORNERINGLATERAL STABLE

0.9PEAK G-FORCE

StabiliGrip self-locking sipes keep blocks rigid under hard steering loads.

LATERAL ROAD ADHESION90% G-LIMIT

HYDROPLANING CLEARANCE3D WATER SIPES

93KM/H THRESHOLD

Evacuates up to 34 liters of water per second through EverGrip sipes expand as tread wears to maintain 100% water clearance throughout life.

WATER CLEARANCE THRESHOLD93 KM/H SAFE

OFFICIAL FITMENT SPECIFICATIONS

Supported Dimensions

Verified OEM vehicle fitments, factory inflation pressures, and axle load ratings calibrated for daily driving safety.

Compatible Vehicle & Trims	Required Tyre Size	Load / Speed Index	Factory Cold Pressure (PSI)	OEM Verification
Ferrari 12CilindriTrims: CoupeModel Years: 2024	275/35 R21	103Y(875 kg / 300 km/h)	32 PSI (Front) / 30 PSI (Rear)All Axles: Front / Rear (32 PSI Front / 30 PSI Rear)	OEM VERIFIED
Ferrari 12Cilindri SpiderTrims: SpiderModel Years: 2024	275/35 R21	103Y(875 kg / 300 km/h)	32 PSI (Front) / 30 PSI (Rear)All Axles: Front / Rear (32 PSI Front / 30 PSI Rear)	OEM VERIFIED
Aston Martin DB12Trims: Coupe, VolanteModel Years: 2023 - 2024	275/35 R21	103Y(875 kg / 300 km/h)	32 PSI (Front) / 30 PSI (Rear)All Axles: Front / Rear (32 PSI Front / 30 PSI Rear)	OEM VERIFIED
Aston Martin VanquishTrims: Coupe, VolanteModel Years: 2024	275/35 R21	103Y(875 kg / 300 km/h)	32 PSI (Front) / 30 PSI (Rear)All Axles: Front / Rear (32 PSI Front / 30 PSI Rear)	OEM VERIFIED