|   HELP With a Wheel Build...What am I doing WRONG??... | T O M A
Jun 5, 2002 11:29 AM | | Am I doing something terribly wrong? Is there a special way to build wheels with uneven flanges?
by no means am i a pro, but i've been happy building wheels for a whileâ"i just follow the instructions in my bicycling repair book.
My happieness came to a crashing halt last night when, for the first time, I'm building a front disc wheel with different size flanges.
I got the spoke lengths from SpoCalc for my DT/Hugi-Hayes front disc hub going on a mavic 517 rim: 260.3 left and 263.3 right. so i rounded up to 261 L and 264 R
I ended up having to get 262 mm spokes in place of the 261 mm spokes but the [expert] wheel builder at the shop said that the 1 mm longer length wouldn't matter. (i didn't think so either) so i purchased the spokes.
So now i'm lacing the wheel (according to the instructions in Bicycling Mag's Complete Guide to Bike Repair & Maintenance) and i end up with half the spokes barely able to grab the nipples and the other half popping out of the top of the rim! |
| Stupid question | shiggy
Jun 5, 2002 11:48 AM | | Did you get the spokes mixed up and put the longer spokes in the left side of the hub?
Question #2- Did you get the ERD from the SpoCalc data base? It is notorious for having the wrong numbers.
Also check to that your lacing pattern is correct. It is very common for a novice (or occasional) wheel builder to mess it up. I still do it once in a while.
Lastly, The 517 rim is a poor choice for a disk wheel. Even with rim brakes they tends to crack at the eyelets and Mavic does not warantee them for disc wheels. |
| Thanks Shiggy... | T O M A
Jun 5, 2002 12:22 PM | | I knew I could count on a fellow SS'r!
That was my first thought last night, but I checked and unbelievably, I had the right lengths in the right flanges! I also re-checked to make sure I was lacing correctly (all those spokes...so confusing!)
So I'm begining to wonder if my ERD (which SpoCalc lists as 540.5) is incorrect, thus making my spoke lengths wrong.
this, of course, would SUCK since I've already laced the spokes and the shop may not take them back. did I mention that I'm trying to hide the cost of all this from my wife? the 517 will have to do, it's all i have laying around.
thanks for your help
btw, anyone know the proper ERD for a 517? |
| What do you mean by..........................? | Wheelman
Jun 5, 2002 5:42 PM | | Hey
What do you mean by "and i end up with half the spokes barely able to grab the nipples and the other half popping out of the top of the rim!" do u mean that the spokes coming from oneside are to long, and that the spokes u have in the other side are to short?
That means that there is a calculation wrong somewhere, or u used the wrong length spokes on each side!
Or
Do you mean that all of the spokes on on half of the wheel are sticking out of the rim, and that the spokes on the other half of the wheel cannot reach your nipples? Are the spokes that are sticking the farest out of the side directly across from the spokes that are the farest away from the nipples?
This scenereo seems to me like you must have laced your wheel wrong, because, the hub is not centered in your rim, that is making the spokes stick out to far on the side that is closes to the hub, and making the spokes seem to short to reach the nipples on the other side, the side that is farest away from the hub.
Maybe you should try an relace your wheel all over again, like you said, it is hard to check your lacing pattern, so why not start all over, like you said your not sure if the bike shop will take the spokes back, so just try again before you take the spokes back
Hope i was of some help!~)
J |
| I should have been more specific in my description... | T O M A
Jun 6, 2002 4:47 AM | | The spoke disparity I'm referring to:
all of the spokes in rounds 1 & 2 (the outside spokes in both flanges) were very loose. rounds 3 & 4 (the inside spokes in both flanges) were very tight.
I haven't looked at it for a few days (went riding instead) but it's supposed to storm like a MF this evening so I'll have more time to mess around with it.
btw, is there any place other than sheldon's web pages to get a proper ERD measurement for a mavic x517 rim? (i looked on mavics website alreadyâ"with no luck) I've got an ERD or 540.5 for this rim, It would help to know weather this is correct or not!
thanks for all of your help.
john |
| See post "i got 4 different figures for 519 ERD..." May 20 (nm) | soulFire
Jun 6, 2002 8:01 AM | | good luck |
| 519 & 517: is the ERD the Same?.... | T O M A
Jun 6, 2002 9:12 AM | | I replaced a few 517 rims with 519's using the original spokes. I never had a spoke length issue with them. are they the same ERD?
thanks for all of your help
john |
| I should have elaborated on my direction of advice... | soulFire
Jun 6, 2002 1:29 PM | | John,
The reference to the earlier post was to give you the ability to measure the ERD yourself. The first reply to the aforementioned post directs the reader on how to get the ERD using two known-length spokes, a couple nipples, a rubber band and something to measure the remaining space. Check it out and that should answer your question. I don't know if 517 and 519 have same ERD, but a mm one way or another won't make a difference if the spoke length is right for the original rim.
jeff |
| Your direction was fine, I just missed that specific Post!... | T O M A
Jun 7, 2002 4:44 AM | | Today at lunch I'm heading over to a REAL bike shop where a REAL mechanic works REAL hours!
No more Performance stores filled with 16 year olds masquerading as seasoned shop mechanics!
If I have no luck today I'll try the spokes&rubberband method tonight.
thanks,
john |
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