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The Stella S-MX 5 has been created for women riders as a performance road and track boot, incorporating the latest technical footwear design and material know-how. Following on from the other performance boots in the Alpinestars range, the S-MX 5 is notable for its comfort, hugging fit, safety performance and ease of adjustability.

There are three basic elements represented in the tire size. They are:

• Size

For example 255/55R-18, P205/65R-15, 37x13.50R17E, etc.

• Service Description

Service description is a combination of load index and speed rating. For example 87Z, 92H, 109Q XL, etc.

• Sidewall Description

Some tire sizes will also be displayed with the manufacturer's abbreviation describing the sidewall design. For example OWL, RBL, WW, etc.For more detailed information on these and all the other markings on your tire, check out our "Reading the Tire Size" article in the Info Center.