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Old 09-05-07, 08:42 PM   #1
BikeManDan
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Wheelbuilding went awry - spokes too long?

I'm trying to build up my first wheel

Alex TD17 700C rim to a Shimano Alfine hub
TD17 is 605mm ERD according to their website
Shimano Alfine has a flange diameter of 104.3mm and I recorded the hub center to flange as 25mm roughly for both sides. Specs here http://bike.shimano.com/catalog/cycl...=1187815175748

Punching these numbers into a spoke calculator gave me 286mm for 32 spoke, 3 cross. I double checked the calculations by doing it in SpoCalc and also http://www.bikeschool.com/spokes/ . Both gave the same.


So I put the wheel together and the spokes just weren't sitting right, they were too long. So I took all of the spokes out and am now back at square one. I then positioned the rim on the sofa and the hub in the cente of the rim with the axle in between the cushions so it remained upright and straight. I then laid a spoke across from the hub flange to the rim in the position that spoke would be in if it were laced and to me, it sure enough seemed like it was just too long by ~10mm.

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Old 09-05-07, 08:48 PM   #2
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are you lacing 2x instead of 3x?
Thats a mistake I commonly make
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Old 09-05-07, 08:51 PM   #3
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Fairly certain I did 3x

First cross was over the adjacent spoke to the left (very close cross), then it was under another spoke, then it was over the final spoke
Wish I took a picture before I dismantled it
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Old 09-05-07, 08:52 PM   #4
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are you lacing 2x instead of 3x?
Thats a mistake I commonly make
That's my first thought also. I second that!
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Old 09-05-07, 09:07 PM   #5
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send a pic of what you've done so far. The third cross in a three-x pattern is very subtle and hard to see.
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Old 09-05-07, 09:20 PM   #6
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Fairly certain I did 3x

First cross was over the adjacent spoke to the left (very close cross), then it was under another spoke, then it was over the final spoke
Wish I took a picture before I dismantled it
The first and second crosses are supposed to be over and the third one is under. However it would 'not effect the length problems you are experiencing.
I had similar problem where in my LBS they calculated the spoke length and I had to return 3 times, progressively getting shorter spokes until I finally got the right size
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Old 09-05-07, 11:15 PM   #7
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Well it was my mistake (surprise surprise)

Alzonder, thank you for pointing that mistake out, it is over, over THEN under.

The big issue was that I was connecting the "laced" spokes at too shallow of an angle. They needed to be one group further away than I was putting it. What threw me off was that to get it to its proper position like it is now, the spoke has to lay a good bit on top of the flange. I figure this must be how its supposed to be, just because the flange is so huge.

So here she is all done, yay first wheel
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Old 09-06-07, 12:07 AM   #8
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Dude, that's a sexy wheel
Congrats
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Old 09-06-07, 12:18 AM   #9
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where did you get the Alfine hub in the US?
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Old 09-06-07, 11:00 AM   #10
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Thanks


I got the Alfine from an online store in Germany, was the only place I found to buy it. It may be available in the US soon but who knows. I was done waiting and just pulled the trigger
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Old 09-06-07, 11:04 AM   #11
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Sweet wheel. My last wheel build I had to take the rear apart twice before I got it right. First time the lacing was off one hole meaning the valve hole was blocked. Then I mis-laced *something* and end up with half too long / half too short of spoke situation.
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