Spoke Tension
10-02-11 | 07:48 AM
#1
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Spoke Tension
Greetings-
when measuring spoke tension with the Park TM-1, are the wheel manufacteur's spoke specs for rims with installed tires at full pressure, or are they for rims only? I notice a significant difference between the two. Taken without tires, tension is somewhat over, or at high end of the specs. With iinstalled tires, tension is well within.
when measuring spoke tension with the Park TM-1, are the wheel manufacteur's spoke specs for rims with installed tires at full pressure, or are they for rims only? I notice a significant difference between the two. Taken without tires, tension is somewhat over, or at high end of the specs. With iinstalled tires, tension is well within.
10-02-11 | 09:55 AM
#3
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Joined: Dec 2007
Posts: 3,518
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From: San Jose, California
Bikes: 2001 Tommasini Sintesi w/ Campagnolo Daytona 10 Speed
With wheel stress relieved and properly dished:
"Without tire inflated."
=8-)
"Without tire inflated."
=8-)
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
10-02-11 | 11:24 AM
#4
Senior Member
Joined: Apr 2009
Posts: 39,897
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From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
If measuring tension and comparing to a published spec it must be done without tires inflated. The reason is very simple if you take a moment to think about it.
If tire inflation causes the tension to change, than the amount of change would vary according to the pressure. That means a manufacturer cannot publish a tension spec with tires inflated unless he also specified the inflation pressure at which the measurement is to me made.
There's also the practical consideration of requiring a wheel builder to mount and inflate a tire in order to check tension, then to remove it when done, or to work on the wheel more.
It's analogous to your height. You measure it without shoes on otherwise the measurement would change daily depending on which shoes you wore, this would mean that a woman would have to give her her height as a range that varied through a range of 5 inches or so.
If tire inflation causes the tension to change, than the amount of change would vary according to the pressure. That means a manufacturer cannot publish a tension spec with tires inflated unless he also specified the inflation pressure at which the measurement is to me made.
There's also the practical consideration of requiring a wheel builder to mount and inflate a tire in order to check tension, then to remove it when done, or to work on the wheel more.
It's analogous to your height. You measure it without shoes on otherwise the measurement would change daily depending on which shoes you wore, this would mean that a woman would have to give her her height as a range that varied through a range of 5 inches or so.
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Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
