The question of tire selection and tire size comes up every now and
then, and I suspect even more so at this time of year, when people are
contemplating buying new sneakers for their cars. So I thought it could
be nice with the following table which I have prepared for the TR6.
The tire selection below is dictated by the standard sizes for the TR6
which is 165/15 for the PI (European cars), and 185/15 for the
carburettor cars (US). The table below contains available tire widths
from 165 up to 215, with diameters varying with profile, so that
standard 165 is the smallest at the top of the table, and standard 185
is the biggest at bottom.
In the table the first column contains the width of the tire running
from 165 up to 215. The second indicates the profile, ie. how tall the
sidewall is measured in % of tire width. The third column contains the
calculated diameter measured in cm (1 in = 2,54 cm), where the sidewall
has been added twice to the rim diameter of 15 in (I assume this is the
proper procedure). The circumference (is there another name for this?)
is calculated by multiplying with pi.
The last two columns contains calculated speeds at 2000rpm in O/D 4th.
This was the only ratio I could remember at 2.95:1 (but if anyone wants
different numbers, I can recalculate). The first gives the speed in
kilometers pr hour, and the last in miles pr hour. Note that I havent
checked these numbers carefully, but the speeds make sense, so they
should give and indication of the variance.
Tire Profile Diameter Circumf Km/t Mph
--------------------------------------------
165 80 64,5 2,026 82 51
205 65 64,75 2,034 83 51
195 70 65,4 2,055 84 52
215 65 66,05 2,075 84 52
175 80 66,1 2,077 84 52
205 70 66,8 2,099 85 53
195 75 67,35 2,116 86 53
185 80 67,7 2,127 87 54
============================================
Lars
TR6 '74 1/2
--
Lars G. Johnsen | Lars.Johnsen@lili.uib.no
Language Technology Project | tlf: +47 55 58 94 61
University of Bergen | fax: +47 55 58 93 54
|