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And now, we wait.
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#152
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But remember, ride=stays true, is the test.
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Chisholm's Custom Wheels Qui Si Parla Campagnolo |
#153
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Thank you Old pal, I guess I have been pampered so far, using mostly high-quality rims and the build went relatively easy without any hitch.
Velocity A23 H Plus Son Archetype Pacenti SL23 HED C2 Belgium Yep...all passed the test so far. |
#154
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Those are all rims that build up well. Add DT to that list and it will be complete.
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Cheers...Daryl Life is too important to be taken seriously |
#155
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Ya need to go toe to toe with a Sun or Fiamme rim..maybe a used one..if ya can make that true/round/dished/tensioned..and it stays that way, you can build anything. As has been mentioned, DT..really excellent rims.
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Chisholm's Custom Wheels Qui Si Parla Campagnolo |
#156
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Advice on spoke tension, please!
Just laced up a set of Campy Victory Strada tubulars to Miche Race hubs, 11-speed, 36 H, using DT Comp DB spokes, 3X, alloy nips in the front and brass in the rear.
Is there an ideal ternsion I should be going for? I've built and tensioned wheels before, but always went by feel, or plucking. I just got a Park TM-1 so I want to do these right. Any suggestions? Thank you!
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"I have always loved riding bicycles, especially for the feeling of freedom and self-sufficiency that they give." --Sheldon Brown |
#157
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Chisholm's Custom Wheels Qui Si Parla Campagnolo |
#158
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Thank you, OP! I'll post photos when I am done. I'm having alot of fun building these wheels.
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"I have always loved riding bicycles, especially for the feeling of freedom and self-sufficiency that they give." --Sheldon Brown |
#159
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I have done a few of those, certainly make me appreciate the ones that come straight and round without much adjustment.
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#160
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The spokes all pull radial inward on the rim, basically trying to shrink the diameter of the rim. When the forces from all the spokes are combined, there can be a very large circumferntial compression load on the rim (often more than 1000 lb.) If the spoke tensions are too high, it can cause the rim to be prone to buckling (when a rim buckles, it can assume the classic "potato chip" shape). The lighter and shallower the rim, the less circumferential compression force it can bear. I have found that a good limit for spoke tension for aluminum rims with 28 or more spokes to be: T = C x W / N where: T = spoke tension in Kgf W = weight of the rim in grams N = number of spokes C = Rim strength constant, which for aluminum rims typically has a value in the range of 8 to 9 Kgf-spokes/gram. From Velobase, the weight of Campagnolo Victory Strada rims is 370 grams. Using a a value of 8.5 for C, the recommended average tension would be: T = (8.5 kgf-spokes/gram) x (370 grams) / (36 spokes) = 87 kgf For rear wheels, the recommended tension will be the average of the (high tension) right and (low tension) left spokes, so depending on flange offsets, you might end up with tensions something like 105 kgf right/ 65 kgf left, which isn't much different from Peter's recommendation. But 100 kgf average tension will be too high for the front wheel, and a value closer to 87 kgf would be recommended. |
#161
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Plus, knowing those rims, the tension is going to be + or - a fair amount also. If it were me, I'd still shoot for 100 kgf(on my DT dial tension meter, 1.83 reading on the dial)..assuming it would be 'around' that but certainly no higher, as these 'can' pull eyelets out.
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Chisholm's Custom Wheels Qui Si Parla Campagnolo Last edited by oldpotatoe; 04-05-2016 at 06:42 AM. |
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Master wheelbuilders in the house!
Mark, Old, Ergott pals... We are so lucky! |
#163
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for rear wheels, shoot for 100 on the drive side. dont be afraid to go a little bit higher, the non-drive side - dont focus on the tension numerical value - whatever it is, it is to dish the wheel correctly, but aim for [relatively] even tension on all nds and ds spokes. front - shoot for even tension on all spokes.
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http://less-than-epic.blogspot.com/ Last edited by AngryScientist; 04-05-2016 at 09:29 AM. |
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Chisholm's Custom Wheels Qui Si Parla Campagnolo Last edited by AngryScientist; 04-05-2016 at 09:29 AM. |
#165
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However, what the formula does illustrate is some of the factors that go into finding the optimum tension. For example, the 28 spoke GEL280 wheel recently discussed in a different thread might be okay with an average tension of 100 kgf. But if that model of rim with 40 spokes were used, 100 kgf average tension would likely result in buckling the rim before it even left the truing stand. If instead the 28 spoke rim were built with a Velocity A23 (450 grams), it could (and should) use a higher tension, perhaps 130 kgf or even more. In fact here's what http://www.velocityusa.com/tech/rims/ says: Quote:
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