Rear wheel truing help
10-21-20, 10:30 PM
#1
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Rear wheel truing help
Hello,
I don't have a ton of experience truing wheels, but I think I know the basics. However, I have a rather weird case.
Recently my chain fell between the cog and wheel and I chewed up 7 of the 14 spokes on the drive side (they are crossed so the seven that got chewed up were the ones closest to the cassette). I went to my LBS and tried to get an exact replacement. I wanted a nonbutted spoke but they only had butted.
So I'm truing the wheel. The non drive side has 14 2mm nonbutted spokes while the drive has 7 butted and 7 nonbutted (alternating so they are distributed equally). The butted spokes are 2mm and neck down to 1.5mm in the middle (so 2, 1.5, 2 going from J bend to threads).
I'm finding on average (using a spoke tension scale) the tension is as follows:
nondrive side: 70kgf
drive side butted: 133kgf
drive side non butted: 135kgf
I'm using a park tension tool knockoff so it isn't the most accurate. For the butted spokes I'm using 1.5mm as the reference in the lookup table for the tool*. For the nonbutted I'm using 2mm:
Am I approaching this correctly or should I treat the butted spokes differently?
Thanks for your help!
*https://www.parktool.com/assets/doc/...conv-table.pdf
I don't have a ton of experience truing wheels, but I think I know the basics. However, I have a rather weird case.
Recently my chain fell between the cog and wheel and I chewed up 7 of the 14 spokes on the drive side (they are crossed so the seven that got chewed up were the ones closest to the cassette). I went to my LBS and tried to get an exact replacement. I wanted a nonbutted spoke but they only had butted.
So I'm truing the wheel. The non drive side has 14 2mm nonbutted spokes while the drive has 7 butted and 7 nonbutted (alternating so they are distributed equally). The butted spokes are 2mm and neck down to 1.5mm in the middle (so 2, 1.5, 2 going from J bend to threads).
I'm finding on average (using a spoke tension scale) the tension is as follows:
nondrive side: 70kgf
drive side butted: 133kgf
drive side non butted: 135kgf
I'm using a park tension tool knockoff so it isn't the most accurate. For the butted spokes I'm using 1.5mm as the reference in the lookup table for the tool*. For the nonbutted I'm using 2mm:
Am I approaching this correctly or should I treat the butted spokes differently?
Thanks for your help!
*https://www.parktool.com/assets/doc/...conv-table.pdf
10-21-20, 11:00 PM
#2
Really Old Senior Member
It was my understanding that once you get around 110? kgf and beyond, you are simply stretching a 1.5mm spoke until you run out of threads?
My minimum for a DS is 15ga/1.8mm. 1.6mm for NDS. I may try a 1.5mm if I build a front wheel for a "smooth pavement" bike
Your theory about tension is correct.
Note edit on first line.
My minimum for a DS is 15ga/1.8mm. 1.6mm for NDS. I may try a 1.5mm if I build a front wheel for a "smooth pavement" bike
Your theory about tension is correct.
Note edit on first line.
Last edited by Bill Kapaun; 10-21-20 at 11:03 PM.
10-21-20, 11:20 PM
#3
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I looked it up and it appears Wheelsmith (the brand of the butted spoke) doesn't make 1.5mm butted, rather 1.7mm. I remeasured it and it looks like it is 1.7mm.
Looks like I need to up the tension on the butted as what I had is actually:
nondrive side: 70kgf
drive side butted: 99kgf
drive side non butted: 135kgf
Looks like I need to up the tension on the butted as what I had is actually:
nondrive side: 70kgf
drive side butted: 99kgf
drive side non butted: 135kgf
10-22-20, 12:20 AM
#4
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update
Well, using the 1.7mm numbers helped a LOT with the consistency of the tension holding and the ease of truing.
I went from
nondrive side: 70kgf
drive side butted: 99kgf
drive side non butted: 135kgf
to
nondrive side: 70kgf
drive side butted: 137kgf
drive side non butted: 135kgf
Its much more stable. I think I'm on the right track.
I went from
nondrive side: 70kgf
drive side butted: 99kgf
drive side non butted: 135kgf
to
nondrive side: 70kgf
drive side butted: 137kgf
drive side non butted: 135kgf
Its much more stable. I think I'm on the right track.
10-22-20, 01:17 AM
#5
Really Old Senior Member
That makes much more sense.
My LBS only has non butted spokes that have yet to be the actual length I've wanted.
My LBS only has non butted spokes that have yet to be the actual length I've wanted.
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10-22-20, 12:30 PM
#6
Senior Member
The important thing to maintain is equal tension. I can't argue that having all of the spokes the same can't hurt but I don't really see a problem.
10-22-20, 12:41 PM
#7
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Hello,
I don't have a ton of experience truing wheels, but I think I know the basics. However, I have a rather weird case.
Recently my chain fell between the cog and wheel and I chewed up 7 of the 14 spokes on the drive side (they are crossed so the seven that got chewed up were the ones closest to the cassette).
I don't have a ton of experience truing wheels, but I think I know the basics. However, I have a rather weird case.
Recently my chain fell between the cog and wheel and I chewed up 7 of the 14 spokes on the drive side (they are crossed so the seven that got chewed up were the ones closest to the cassette).
10-23-20, 11:12 AM
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Your tension meter is out of calibration.
=8-|
=8-|
__________________
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
10-23-20, 12:19 PM
#9
Senior Member
