DTSwiss R23/24 rebuild, spoke tension

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rainerhq
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by rainerhq

I had DTSwiss R23 rear wheel and R24 front wheel. Disc brake, 24 spokes. Rear has DT aero comp spokes 2.0/1.2/2.0. For front, I´m not sure.
I decided to replace the rims with tubular carbon rims, for CX use. So I found/bought rims and let LBS first replace the rear wheel rim. I was not 100% sure, will the existing spokes fit, but they did.
I measured spoke tension before rebuilding and after. Here comes my question.
With Alu rim it was NDS 97-107; DS 146-163.
Now with carbon rim its NDS 50-56; DS 81-107. Is it to low? I think it should be at least the same level as it was with alu rim.

Weight saving wasn´t the goal, but rear wheel is 120g lighter now :thumbup:

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Beaver
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by Beaver

Usually carbon rims should take the same tension as aluminium rims. What does the manufacturer of your carbon rims recommend?

alcatraz
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by alcatraz

That is quite a lot lower.

What strikes me as odd is that the tension distribution seems different. You had 2/3 DS on NDS and now you have 1/2 DS on NDS. Is it possible your measurement is off? How is the dishing?

/a

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rainerhq
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by rainerhq

The tensionmeter is bit off yes. It gives two different readings on the same spoke. Dishing is correct.
I went back to LBS and he put more tension. Its now almost the same as it was with alu rims. I´m not worried anymore.
The mechanic there has always used his hand and ear as a tensionmeter and its very hard to convince him, that he can trust this cadget. He has it also.
These are chinese rims from carbonal.
Front wheel is now 208g lighter.
Carbon rims are 318+322g. DT rims are 434+522g.
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alcatraz
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by alcatraz

I'm thinking of buying one of those tensionometers. How do you use it on bladed spokes? Won't the angle you hold it at cause the reading to vary a lot?

How safe is it to assume that the reading is correct? We all like stiff wheels but going close to the max tension will be a bit nervracking if the tensionometer's readings are doubtful. :)

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kavitator
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by kavitator

What tensiometer did you use?

Good is to have calibration tool for tensiometer - otherwise you dont know what is max tension (new PK were no use i have 2 and calibrated them)

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rainerhq
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by rainerhq

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rainerhq
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by rainerhq

alcatraz wrote:
Wed May 23, 2018 1:47 am
How do you use it on bladed spokes? Won't the angle you hold it at cause the reading to vary a lot?
I measurued from the flat/wide side.
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