Park Tool TM-1 Manual

Park Tool Cykeltilbehør TM-1

Læs gratis den danske manual til Park Tool TM-1 (6 sider) i kategorien Cykeltilbehør. Denne vejledning er vurderet som hjælpsom af 45 personer og har en gennemsnitlig bedømmelse på 4.9 stjerner ud af 23 anmeldelser. Har du et spørgsmål om Park Tool TM-1, eller vil du spørge andre brugere om produktet?

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5115 Hadley Ave. N., St. Paul, MN 55128 (USA) www.parktool.com

PARK TOOL CO. 5115 Hadley Ave. N., St. Paul, MN 55128 (USA) www.parktool.com

PARK TOOL CO.

TM-1 Tension Meter

The TM-1 can be used to accurately and reliably

measure the tension of each spoke in a wheel, the

average tension of all the spokes in a wheel, and the

relative tension between all the spokes in the wheel.

It works on nearly any bicycle spoke, no matter

what the diameter, material, or shape.

SPOKE TENSION

Wheels that are strong, reliable and long-lasting

have spokes that are properly tensioned. Tension is

the amount of force pulling on a wheel’s spokes. Spokes that have low tension

will continue to loosen as the bike is ridden, resulting in shortened spoke life

and a wheel that requires continuous re-truing. Spokes that have too much

tension can result in deforming and/or cracks near the nipple holes of the rim,

around the ﬂange of the hub, and at the wrench ﬂats of the spoke nipple.

In addition to achieving proper spoke tension, it is also important for all

the spokes in the wheel to have approximately the same relative tension.

Relatively great differences in tension between each of the spokes will result

in a wheel that is not laterally stable and that will come out of true more

easily and more frequently.

The recommended tension for spokes in bicycle wheels can be as low as 80

kilograms force (kgf) and as high as 130 kilograms force. As a rule of thumb, it

is best to set tension as high as the weakest link in the system will allow, which

for a bicycle wheel is usually the rim. Therefore, to obtain a spoke tension

recommendation for a speciﬁc wheel, it is best to contact the rim manufacturer.

MEASURING TENSION OF A SPOKE

1. Measure the diameter of the spoke using the included spoke diameter

gauge. The smallest slot the spoke ﬁts into determines the diameter. For

butted spokes, measure the narrowest portion of the spoke. A measuring

caliper can also be used to measure the spoke diameter.

2. Hold the TM-1 horizontally (ﬂat). Squeeze the TM-1 at the handle grips

(ref. #17) as in Picture 1. Place the spoke between the two ﬁxed posts

(ref. #3) and the moveable post (ref. #4) as in Picture 2. Gently release

handles. NOTE: With butted spokes, position the posts so they rest on the

narrowest portion of spoke. With aero/bladed spokes, position the posts

so they rest against the wide, ﬂat side of the spoke.

3. With the TM-1 engaged on the spoke, the pointer (ref. #14) will be pointing

to a number on the tool’s graduated scale. This number is a deﬂection

reading that is used in conjunction with the TM-1’s conversion table to

determine the actual tension of the spoke.

4. Using the conversion table, ﬁnd the column corresponding to the material

and diameter of the spoke being measured. Follow the column down to

the row corresponding to the spoke’s deﬂection reading (as determined

in step 3). The number at this intersection is the actual tension of the

spoke in kilograms force (kgf).

* Other units of force sometimes used are Newtons and pounds force. One

kilogram force is approximately equal to 10 Newtons or 2.2 pounds force.

MEASURING AVERAGE SPOKE TENSION

The average tension is the sum of the individual spoke tension measurements,

divided by the number of spokes measured. Each wheel has two averages,

one for the left side spokes and one for the right side spokes. If the spoke hole

ﬂanges of the hub are centered between the locknuts of the hub, it is possible

for the left and right sides to have nearly equal average tension. However,

if the spoke hole ﬂanges are not centered between the locknuts of the hub,

such as on most rear wheels and front wheels with disc brake mounts, it is

not possible to have the same tension between left and right side spokes.

To determine average tension:

1. Take deﬂection readings of all the spokes on the right side of the wheel.

Record these numbers.

2. Add the recorded numbers together.

3. Divide the sum of the recorded numbers by the number of spokes

measured. This number is the average of the deﬂection readings.

4. Use the conversion table to convert the average deﬂection reading into

the average spoke tension in kilograms force.

5. Repeat steps 1–4 for the left side of the wheel.

MEASURING RELATIVE SPOKE TENSION

Relative tension is the tension of a spoke in comparison to the tension of one

or more other spokes. A wheel with spokes that are within plus or minus

20% of the wheel’s average spoke tension is generally considered to have

acceptable relative tension. As explained on page 3, the spokes on one side

of a wheel may be tensioned differently than the spokes on the opposite side.

Therefore, it is important to only compare the tension of a spoke relative to

spokes on the same side of the wheel.

To determine relative tension:

1. Determine the average tension of the spokes on the right side of the wheel.

2. Multiply the average tension by .8 and by 1.2. The resulting two numbers

will provide the acceptable relative tension range.

3. Use the TM-1 to take deﬂection readings of each individual spoke and

use the conversion chart to convert the readings into individual tension

measurements.

4. Determine if the individual tension measurements fall within the

acceptable relative tension range from step 2.

5. Repeat steps 1–4 for the left side of the wheel. If the spokes are not

within the acceptable range of relative tension, adjustments need to be

made to the tension of the spokes

NOTES:

These instructions provide basic information for using the TM-1 Tension

Meter. For a thorough discussion on use of the TM-1, as well as updated

calibration tables and information on a variety of wheel topics, visit the Park

Tool web site: (www.parktool.com).

The TM-1 Tension Meter is calibrated at the Park Tool manufacturing facility.

Do not readjust the spring, spring adjustment screw or any other parts. If the

tool is worn or damaged and appears to be inaccurate, return to Park Tool for

recalibration. Park Tool will recalibrate and return the tool for a reasonable charge.

The TM-1 Tension Meter is a precision measuring instrument and should

be used and stored with care. To avoid damage, it is recommended that the

TM-1 be stored in it’s original packaging or suspended from a bench hook. It

should always be kept clean and dry.

TM-1 Instructions / Instructions / Anleitung / Instrucciones

1 2

Produkt Specifikationer

Mærke:	Park Tool
Kategori:	Cykeltilbehør
Model:	TM-1

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