Manuals+

IWSC GTP Tire Usage Requirements for Indianapolis

Michelin Motorsport Technical Bulletin

Bulletin Number: MMTB-IWSC-2025-17

Date: 3 September 2025

Front Tire Specifications

Tire Size: 29/71-18

Nominal Rim: 12.5 (+0/-0.5)x18

# stints Front Slick Tire 29/71-18 GTP - Indianapolis 2025

Camber \ Pressure 1.7 b = 24.7 psi 1.8 b = 26.1 psi 1.9 b = 27.6 psi 2 b = 29.0 psi
Max -3.50°233
Max -3.30°233
Max -3.00°233
Max -2.75°333
Max -2.50°333
Max -2.25°333
Max -2.00°333
Max -1.75°333
Min -1.00°333

Rear Tire Specifications

Tire Size: 34/71-18

Nominal Rim: 14 (+0/-0.5)x18

# stints Rear Slick Tire 34/71-18 GTP - Indianapolis 2025

Camber \ Pressure 1.7 b = 24.7 psi 1.8 b = 26.1 psi 1.9 b = 27.6 psi 2 b = 29.0 psi
Max -3.00°233
Max -2.8°233
Max -2.5°333
Max -2.3°333
Max -2.00°333
Max -1.8°333
Max -1.50°333
Max -1.3°333
Min -1.00°333

TPMS Mandatory Information

Stabilized Pressure: Average pressure over one lap when pressure variation lap-to-lap is ≤ 1% during stint.

Recommended minimum cold pressure: Stabilized pressure -0.6b

Recommended maximum stint length: 175km

Minimum Static Pressure (for tire pressure control in pit box): 1.7b

Wet Tire Operating Conditions

% Best Lap Time vs Slick: 249D/449D

Wet 138% - 114% 113% - 104% ≥1.6b for 75% of stint length
Wet2 stints - 1.6b1 stint - 1.6b
*If pressure after 5 laps is: 1.5b - 1.6b, tires should be changed before 20 laps
*If pressure after 5 laps is: < 1.5b, tires should be changed before 10 laps

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