5115 Hadley Ave. N., St. Paul, MN 55128 (USA) www.parktool.com
PARK TOOL CO.
BDT-2
Instructions / Instructions / Anleitung / Instrucciones
BDT-2 Belt Drive Tension and Alignment Tool
The BDT-2 is a gauge designed to help set the proper tension on most
belt drive systems and sizes. The BDT-2 also gauges rear cog parallelism and
angularity.
MEASURING TENSION:
1. Place BDT-2 on belt making sure that the entire length of the BDT-2
tool will contact the belt.
In order to get an accurate tension reading
it is critical that the tool contacts only the belt and does not contact
something like a cog or pant guard as this will prevent an accurate
tension reading!
2. Push down on the BDT-2 until both the front and rear of the tool make full
contact with the belt.
3. Read the gauge. The tension of the belt can be determined by comparing
the center line of the indicator to the scale.
4. If the indicator becomes stuck and does not return to zero, manually re-
center the spring and repeat steps 1-3.
SUGGESTED TENSION RANGE:
Continental:
6–9
Gates:
For single speed urban and mountain bikes, the tension should be set
between 8 and 10, with 8 reflecting a lower typical tension. For bikes with
internal geared hubs, contact Gates.
(www.gatescarbondrive.com/tech/overview)
When in doubt please consult with the bike and/or belt manufacturer for
precise belt tension specifications.
MEASURING PARALLELISM AND ANGULARITY ALIGNMENT:
1. Turn the tool over with the tension gauge facing up and away from
the belt.
2. Place locating tab against top
and outside edge of rear cog
while applying constant and
firm pressure.
3. Outside edge of the front cog
should fall within the width of
the alignment indicator. If the
outside edge of the front cog
does NOT fall within the width
of the alignment indicator then
the front and rear cogs are not
within specifications and must
be adjusted.
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