Tesla 2010 Roadster, Owner'S Manual, Page: 89 / 122

Wheels and tyres
8-15 Maintenance and care
TR0057
22 5/4
5 R
17
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1
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12
2
3
4
5
6
7
8
9
10
11
Tyre markings
1, Tyre width
This three digit number gives the width in
millimetres of the tyre from sidewall edge
to sidewall edge.
2, Aspect ratio
This two digit number, known as the
aspect ratio or profile, gives the sidewall
height as a percentage of the tread width.
So, if the tread width is 205 mm, and the
aspect ratio is 50, the sidewall height will
be 102 mm.
3, Tyre construction
R indicates that the tyre is of Radial ply
construction.
4, Wheel diameter
This two digit number is the diameter of
the wheel rim in inches.
5, Load index
This two or three digit number is the tyre's
load index. It is a measurement of how
much weight each tyre can support. This
number is not always shown.
6, Speed rating
The speed rating, when stated, denotes
the maximum speed at which the tyre
should be used for extended periods. The
ratings range from 99 mph to 186 mph.
These ratings are listed in the following
table.