Here are the propeller specifications for the 172I from the Type Certificate Data Sheet.

Note that propeller number 2 and propeller number 4 are for seaplanes. The pitch on all three landplane propellers is 53 inches, and the easiest way to verify the pitch is to have a qualified propeller shop measure it for you.

Propeller and propeller limits

1. Propeller
(a) McCauley 1C172/MTM 7653
Static rpm at maximum permissible throttle setting:
Not over 2360, not under 2260
No additional tolerance permitted (see Note 3)
Diameter: not over 76 in., not under 74 in.
(b) Spinner, Dwg. 0550320

2. Propeller (seaplane only)
(a) McCauley 1A175/ATM 8042
Static rpm at maximum permissible throttle setting:
Not over 2480, not under 2380
No additional tolerance permitted (see Note 3)
Diameter: not over 80 in., not under 78.4 in.
(b) Spinner, Dwg. 0550320

3. Propeller
(a) McCauley 1C160/CTM 7553
Static rpm at maximum permissible throttle setting:
Not over 2370, not under 2270
No additional tolerance permitted (see Note 3)
Diameter: not over 75 in., not under 74 in.
(b) Spinner, Dwg. 0550320

4. Propeller (seaplane only)
(a) McCauley 1A175/ETM 8042
Static rpm at maximum permissible throttle setting:
Not over 2480, not under 2380
No additional tolerance permitted (see Note 3)
Diameter: not over 80 in., not under 78.4 in.
(b) Spinner, Dwg. 0550321

5. Propeller
(a) McCauley 1C160/DTM 7553
Static rpm at maximum permissible throttle setting:
Not over 2370, not under 2270
No additional tolerance permitted (see Note 3)
Diameter: not over 75 in., not under 74 in.
(b) Spinner, Dwg. 0550320