|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
(Un)even spoke tension
I recently built a rear wheel where the eyelets deviate a bit. I'm not
able to make this wheel true (.25mm) with an even spoke tension. It's well known that even spoke tension is essential for a long lasting wheel. But I believe that even spoke tension is more important for some spokes than others. Please, comment on the following. I'm talking about a rear wheel, without disc brakes. If we divide the spokes into four categories we get: Drive side, pulling spokes Drive side, braking spokes Non-drive side, pulling spokes Non-drive side, braking spokes I believe that the hardest working spokes are the Drive side Pulling spokes. These spokes tighten up under high pedal force. Therefore these should share the load – even spoke tension. The Non-drive side spokes have less tension, 2/3 or so. The braking spokes will loosen up a bit under high pedal force. Therefore these spokes should also have even tension so none of them are looser than others, which could cause them to slack. Lastly we have the drive side braking spokes and the non-drive side pulling spokes. The Drive side braking spokes have a high tension under no load but loosen a bit under pedal force. Since they never get tighter I think some of these spokes can have a higher tension. A little looser may also be acceptable since they have a high tension at no load. The Non-drive side pulling spokes have approximately 2/3 the tension at no load. Some spokes can therefore be tightened a little more, maybe up to same tension as the drive side. They may also be able to have a little less tension since they never loosen under load. If you know about wheel building please comment on this. Thanks, Frank A few points: Unless the wheel in question has a hub brake, there are no "braking" spokes as rim brakes apply no torque to the spokes or the hub. Your statement that some spokes on the non-drive side can be safely tightened up to the tension of the drive-side spokes is incorrect for any dished wheel. To maintain the rim in the dished position, that is, not centered between the hub flanges, the left side tension must always be lower than the right side spokes. The sentence "They[Non-drive side pulling spokes] may also be able to have a little less tension since they never loosen under load." suggests that you are unaware that decreased tension in the spokes under the hub is what provides the upward force that supports the weight on the hub. It is true that spoke tension must be high enough that they never "loosen" but it's better to say that the tension never falls to zero. Even and high tension, along with stress relief, are essential to a long lasting and strong wheel. In any dished wheel, the tension is necessarily unequal between the two sides. -- Ted Bennett Portland OR |
Ads |
#2
|
|||
|
|||
(Un)even spoke tension
On 16 Jul 2003 21:34:39 -0700, (Frank) may have said:
I recently built a rear wheel where the eyelets deviate a bit. I'm not able to make this wheel true (.25mm) with an even spoke tension. Perhaps this may provide some help: http://www.sheldonbrown.com/wheelbuild.html After reading that, I concluded that previously, I'd had no idea just how little I really knew about the subject. --- My email address is antispammed; pull WEEDS if replying via e-mail. Yes, I have a killfile. If I don't respond to something, it's also possible that I'm busy. |
#3
|
|||
|
|||
(Un)even spoke tension
"Frank" wrote in message
m... I recently built a rear wheel where the eyelets deviate a bit. I'm not able to make this wheel true (.25mm) with an even spoke tension. If you really want to understand wheels and wheel building, buy Jobst Brandt's book "The Bicycle Wheel". |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
road pedals with adjustable float and release tension ? | Chris Esposito | General | 3 | July 13th 04 08:41 PM |
Toasted Rear XT derailer B Tension Screw Holder | Loomer | Mountain Biking | 2 | May 28th 04 11:13 AM |
Park spoke tension meter??? | Zilla | Mountain Biking | 2 | April 20th 04 02:14 AM |