Gunson Laser Trakrite Conversion Chart

Converting Linear Wheel Alignment Values to
Degrees° Minutes’.
1 minute = 1/60 th of 1 degree thus 60 minutes = 1 degree. Not to be confused
with decimal degrees.
1°30’ = 1 ½ degrees (using degrees° & minutes’) Trakrite Laser uses these.
1.5° = 1 ½ degrees (using decimal degrees)
If you have inch” fractions or decimal inch” values see below charts for
conversion to mm’s first.
Chart values are rounded to the nearest minute’
mm
Gunson Trakrite Laser System Part no: 77113
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Wheel Size
13 inch 14 inch 15 inch 16 inch 17 inch
0.1 1’ 1’ 1’ 1’ 1’
0.2 2’ 2’ 2’ 2’ 2’
0.3 3’ 3’ 3’ 3’ 2’
0.4 4’ 4’ 4’ 3’ 3’
0.5 5’ 5’ 5’ 4’ 4’
0.6 6’ 6’ 5’ 5’ 5’
0.7 7’ 7’ 6’ 6’ 6’
0.8 8’ 8’ 7’ 7’ 6’
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0.9 9’ 9’ 8’ 8’ 7’
If required simply add the decimal fraction from above to the whole mm from
below (example 5.5 mm on 13 inch wheels would be 52’+5’ = 57’)
1 10’ 10’ 9’ 8’ 8’
2 21’ 19’ 18’ 17’ 16’
3 31’ 29’ 27’ 25’ 24’
4 42’ 39’ 36’ 34’ 32’
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5 52’ 48’ 45’ 42’ 40’
6 1° 02’ 58’ 54’ 51’ 48’
7 1° 13’ 1° 08’ 1° 03’ 59’ 56’
8 1° 23’ 1° 17’ 1° 12’ 1° 08’ 1° 04’
9 1° 34’ 1° 27’ 1° 21’ 1° 16’ 1° 11’
10 1° 44’ 1° 37’ 1° 30’ 1° 25’ 1° 20’
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11 1° 55’ 1° 46’ 1° 39’ 1° 33’ 1° 28’
12 2° 05’ 1° 56’ 1° 48’ 1° 41’ 1° 35’
13 2° 15’ 2° 05’ 1° 57’ 1° 50’ 1° 43’
14 2° 26’ 2° 15’ 2° 06’ 1° 58’ 1° 52’
15 2° 36’ 2° 25’ 2° 15’ 2° 07’ 1° 59’
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mms
Wheel Size
18 inch 19 inch 20 inch 21 inch 22 inch
0.1 1’ 1’ 1’ 1’ 0’
0.2 2’ 1’ 1’ 1’ 1’
0.3 2’ 2’ 2’ 2’ 2’
0.4 3’ 3’ 3’ 3’ 2’
0.5 4’ 4’ 3’ 3’ 3’
0.6 5’ 4’ 4’ 4’ 4’
0.7 5’ 5’ 5’ 5’ 5’
0.8 6’ 6’ 5’ 5’ 5’
0.9 7’ 6’ 6’ 6’ 6’
If required simply add the decimal fraction from above to the whole mm from
below (example 5.5 mm on 13 inch wheels would be 52’+5’ = 57’)
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1 8’ 7’ 7’ 6’ 6’
2 15’ 14’ 14’ 13’ 12’
3 23’ 21’ 20’ 19’ 18’
4 30’ 29’ 27’ 26’ 25’
5 38’ 36’ 34’ 32’ 31’
6 45’ 43’ 41’ 39’ 37’
7 53’ 50’ 47’ 45’ 43’
8 1° 57’ 54’ 52’ 49’
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9 1° 08’ 1° 04’ 1° 01’ 58’ 55’
10 1° 15’ 1° 11’ 1° 08’ 1° 04’ 1° 02’
11 1° 23’ 1° 19’ 1° 15’ 1° 11’ 1° 08’
12 1° 30’ 1° 25’ 1° 21’ 1° 17’ 1° 14’
13 1° 38’ 1° 32’ 1° 28’ 1° 24’ 1° 20’
14 1° 45’ 1° 40’ 1° 35’ 1° 30’ 1° 26’
15 1° 53’ 1° 47’ 1° 41’ 1° 37’ 1° 32’
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Convert inch” fractions to mm rounded to 1 decimal place using the chart
below.
“ fraction mm “ fraction mm
1/64 0.4 33/64 13.1
1/32 0.8 17/32 13.5
3/64 1.2 35/64 13.9
1/16 1.6 9/16 14.3
5/64 2.0 37/64 14.7
3/32 2.4 19/32 15.1
7/64 2.8 39/64 15.5
1/8 3.2 5/8 15.9
9/64 3.6 41/64 16.3
5/32 4 21/32 16.7
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11/64 4.4 43/64 17.1
3/16 4.8 11/16 17.5
13/64 5.2 45/64 17.9
7/32 5.6 23/32 18.3
15/64 6 47/64 18.7
1/4 6.4 3/4 19.1
17/64 6.7 49/64 19.4
9/32 7.1 25/32 19.8
19/64 7.5 51/64 20.2
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5/16 7.9 13/16 20.6
21/64 8.3 53/64 21.0
11/32 8.7 27/32 21.4
23/64 9.1 55/64 21.8
3/8 9.5 7/8 22.2
25/64 9.9 57/64 22.6
13/32 10.3 29/32 23.0
27/64 10.7 59/64 23.4
7/16 11.1 15/16 23.8
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29/64 11.5 61/64 24.2
15/32 11.9 31/32 24.6
31/64 12.3 63/64 25.0
1/2 12.7 1 25.4
To convert decimal inch” values to mm multiply value by 25.4
(example 0.25” inch multiplied by 25.4 = 6.35mm).
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Round the result to the nearest 1 decimal place.
Rounding rule used, if 2 nd decimal place is below 5 then just delete it, if 2 nd
decimal place is 5 or above then delete it and add 1 to the first decimal place.
(example 6.34mm becomes 6.3mm but 6.35 becomes 6.4).
When you have your value in mm refer to the correct wheel size chart
above.
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