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Discussion Starter · #4 ·
Best way to know is to measure it yourself!
Not so easy to measure when the wheel is laced up with spokes and hubs! Through the valve hole I measured the distance from the inner rim wall to the central part of the hub, added half the diameter of the central diameter of the hub, added 2 mm for nipple head and finally multiplied everything with 2. This gave an ERD of 602 mm, but I do not feel it was very accurate.
 

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Not so easy to measure when the wheel is laced up with spokes and hubs! Through the valve hole I measured the distance from the inner rim wall to the central part of the hub, added half the diameter of the central diameter of the hub, added 2 mm for nipple head and finally multiplied everything with 2. This gave an ERD of 602 mm, but I do not feel it was very accurate.
Well you did not state that up front. Nor why you even want to know.
 

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Discussion Starter · #6 ·
Well you did not state that up front. Nor why you even want to know.
I want an extra wheel set for my Epic and I have a pair of nice hubs from a 2012 Roval SL 29er wheel set (142+ rear) and I want to lace them up with the Light-Bicycle Wide 29er rims (ERD 603 mm). I also have the spokes from the wheel set, and my hope that also the spokes can be reused.

A related question: how do I calculate the spoke length for these hubs?. I do not find any spoke calculator that has these hubs in their data base. They are not identical to any DT Swiss straight pull hub as far as I can see. it is difficult to measure the flange distance and in particular the pitch circle diameter (except on the right side of the front wheel where the spokes are radially laced).

So where do I find the necessary geometrical dimensions needed for input?
 

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Visit a wheelbuilder. For what it would cost, the price to get a proper build to professional standards is worth it. I wrench everything on my bikes, including suspension (ex Brain), but leave the wheelbuilding to the pro's. Anyone can build a set of wheels, but they won't last unless you work to standards and have the tools that the pro's do.
 

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Discussion Starter · #9 ·
Visit a wheelbuilder. For what it would cost, the price to get a proper build to professional standards is worth it. I wrench everything on my bikes, including suspension (ex Brain), but leave the wheelbuilding to the pro's. Anyone can build a set of wheels, but they won't last unless you work to standards and have the tools that the pro's do.
I wrench everything on my bikes, including suspension (ex Brain) and in particular I want to service the most important component, the precious wheel set, myself. The e-book wmodavis mention gives an excellent background and my tools cost less than USD 100 including a device for measuring spoke tension which is strictly not necessary (according to the book).
 

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I have just measured a Spec Carbon Roval rim and my result is 601.5. I have a rim without spokes and hub in my workshop, so it was easy to measure with a ruler, two spokes glued to a nipple each and cut to 20 cm.
 

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Thanks. I need to repair a couple of bent spokes on my rear wheel and I've been searching for the ERD info.

since I'm here and you guys might know....

What length spokes did you folks use?
 
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