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Old 06-01-09, 05:49 AM   #1
ciriarte
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Alfine Wheel Build

I'm planning on building a wheel with an Alfine 8-spd hub and Alex TD17 rims (36H); after an exhaustive internet search, I've finally found the data I need to calculate the spoke length (parts not yet in hand), but I'm unable to find the hub spoke hole diameter.

Can anyone who's buillt an Alfine-hubbed wheel offer some advice/recommend a spoke?

Thanks,
Chris
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Old 06-01-09, 06:12 AM   #2
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Quote:
Originally Posted by ciriarte View Post
I'm planning on building a wheel with an Alfine 8-spd hub and Alex TD17 rims (36H); after an exhaustive internet search, I've finally found the data I need to calculate the spoke length (parts not yet in hand), but I'm unable to find the hub spoke hole diameter.

Can anyone who's buillt an Alfine-hubbed wheel offer some advice/recommend a spoke?

Thanks,
Chris
Are you asking about the spoke circle diameter, or the actual hole. I have built one with DT Alpine spokes which are 13 g at the elbow with no problem.
The spoke circle dia. is the same as a nexus 8. I've used Damon Rinard's calculator several times for Alfine hubs, and just use Nexus 8 roller brake data.
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Old 06-01-09, 08:39 AM   #3
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Hei,

I use this Shimano dimension chart.
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Old 06-01-09, 01:13 PM   #4
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Alfine Wheel Build

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Originally Posted by Dan Burkhart View Post
Are you asking about the spoke circle diameter, or the actual hole. I have built one with DT Alpine spokes which are 13 g at the elbow with no problem.
The spoke circle dia. is the same as a nexus 8. I've used Damon Rinard's calculator several times for Alfine hubs, and just use Nexus 8 roller brake data.
Thanks Dan. I was speaking of the hole diameter, not the PCD. So a 13g fit ... that's the info I was looking for! I'm putting this on a cargo bike, so I want to make this wheel as robust as possible.

Chris
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Old 06-01-09, 01:14 PM   #5
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Alfine Wheel Build

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Hei,

I use this Shimano dimension chart.
Thanks, hartsu. Unfortunately, for some reason Shimano did not include the spoke hole diameter in that chart.

Chris
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Old 06-01-09, 02:06 PM   #6
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It is going to be about 2mm. Honestly, any error in that calculation isn't going to be the deciding factor on the length of your spokes.
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Old 06-01-09, 02:38 PM   #7
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Alfine Wheel Build

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It is going to be about 2mm. Honestly, any error in that calculation isn't going to be the deciding factor on the length of your spokes.
Hi jccaclimber,

I wasn't worried about the length; I want to make this wheel as strong as possible, and I was worried about getting too thick a spoke that wouldn't fit through the hole.

As far as a strong wheel, would a double or triple butted spoke be OK on a cargo bike rear wheel, or should I go with a straight gauge?

Chris
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Old 06-01-09, 06:22 PM   #8
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In many ways, a double-butted spoke will be more durable. Spokes break at the threads or elbows. The threads and elbows of straight and double-butted spokes of the same gauge are the same. Butting allows the spoke to stretch, absorbing stress, where a straight gauge spoke transfers all the stress onto the elbow. Straight-gauge cost less, and simplify the build since they won't twist as much once you get close to final tension.
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Old 06-01-09, 09:42 PM   #9
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In many ways, a double-butted spoke will be more durable. Spokes break at the threads or elbows. The threads and elbows of straight and double-butted spokes of the same gauge are the same. Butting allows the spoke to stretch, absorbing stress, where a straight gauge spoke transfers all the stress onto the elbow. Straight-gauge cost less, and simplify the build since they won't twist as much once you get close to final tension.
Hmmm ... as our favorite Vulcan would say; "logical."

Chris
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Old 06-07-09, 08:24 AM   #10
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Originally Posted by ciriarte View Post
Hi jccaclimber,

I wasn't worried about the length; I want to make this wheel as strong as possible, and I was worried about getting too thick a spoke that wouldn't fit through the hole.

As far as a strong wheel, would a double or triple butted spoke be OK on a cargo bike rear wheel, or should I go with a straight gauge?

Chris
Vredstein has it covered, but since I was asked I'll throw in my 2 cents. I agree completely with what he said. Strait gauge spokes are a bit cheaper, and a touch easier to build into a wheel. Durability however will come from double and triple gauge spokes. The places that I have seen triple gauge spokes are on Tandem wheels, although I know some mtb guys that have used them as well. I'm not sure why the mtb guys are using them as they were always bending their rims out of true long before they ever fatigued spokes. As for cost, I figure that by the time I'm done paying for hubs, rims, and strait gauge stainless spokes, as well as taking the trouble to properly build the wheel, the added cost to have gone double butted instead of strait gauge is insignificant, so you might as well at least do that. As far as fitting through the hub, other than wheels which require custom spokes (ksyrium for example), I have not yet had an issue with spokes that I could not get through a hub flange. I did have a very difficult time getting spokes through my DT Swiss tandem hubs. However, that was due to the thickness of the flange rather than the diameter of the hole.
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