These are a pair of CEN Racing 2.2" monster truck tires.  These are a direct fit on to the stock SMT10 wheels, as well as all aftermarket 2.2" wheels like the JConcepts Midwest wheels. 

Note:  Tires do NOT include foam inserts. 

Specifications:

• Dimensions: 5.3" x 3.0" (135 x 76mm)
• Inner Diameter: 2.2"
• Weight (without foam):  4.1 oz per tire

• Fit stock SMT10 or aftermarket 2.2" wheels

What's included:

• 2x CEN Racing 2.2" MT Tires