Measuring Tire Size - BD Diesel Performance Ultra X-Tuner Installation Instructions Manual

8 January 2009 BD Duramax 6.6L X-Tuner # 1054861/1054862 7

Measuring Tire Size

When using the tuner to input a bigger-than-
stock size tire (for fixing erroneous
speedometer values), then your tire must be
measured for the proper calculations to be
used.
Measure the tire vertically with a tape
measure. It may help to have a tool with a flat
edge (i.e. a ruler) resting on top of your tire
for a more accurate reading. Measure your
vehicle's tire (in inches) and round it up to
the nearest quarter of an inch. When
measuring the tire, both the tire and rim must
be included.
This option can be found in the Change
Setup / Options / Tire Height menu.
BD Engine Brake Inc
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Ph: 604.853.6096 Fax: 604.853.8749 Internet: www.bd-power.com