The higher the shore number, the hader the tire compound.
33 shore are softer than 40
Its kind of difficult to say what shore you will need without knowing the condition of the surface.
Smooth, course, it is a little difficult to say.
Usually a safe bet would be some where around 37 shore<not the softest, not the hardest>.
Soft tires will wear out faster than the harder shore tires
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