Indiana Administrative Code
Title 575 - STATE SCHOOL BUS COMMITTEE
Article 1 - MINIMUM SPECIFICATIONS FOR SCHOOL BUSES
Rule 9 - Type A, Type B, Type C, and Type D School Buses
Section 9-76 - Tires and rims

(a) The tires must be of equal size, construction, and ply rating and have rims of equal size per axle. All tires must conform to the GAWR.

(b) Regrooved or retread tires on front or single rear wheels are prohibited.

(c) The bus distributor's or manufacturer's recommendation on tire and rim size must be followed.

(d) Single rear wheels for Type B, Type C, or Type D buses are prohibited.

(e) Radial, mud, and snow tires may be used.

(f) A spare tire may be used but may not be mounted inside the passenger compartment.

(g) Tire overspray guards, such as mud flaps and overspray systems, may be used.