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Wheel building - help


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ukdodger

26/10/09 14:11

5 forum posts

For the life of me I cant work out the difference between Spoke Centre and Rim Centre. I've been trying to work out the length of spokes I need and came across this link.

http://www.geocities.com/spokeanwheel/measure.htm

It all made sense to me until I got to the last section 'RIM SPOKE HOLE OFFSET AND STAGGER'

I just dont get it. The centre line of the rim is the centre line of spokes holes unless the holes are unevenly staggered. Is that not correct? What am I missing here?

Many Thanks
RD

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Mike Spence

26/10/09 15:18

Try a decent spoke calculator... http://www.dtswiss.com/SpokesCalc/Welcome.aspx?language=en

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ukdodger

26/10/09 15:30

5 forum posts

Thanks Mike. I've actually got plenty of them. But doing it for the first time I want to know how to do it the long way.

Thanks for replying

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Mike Spence

26/10/09 15:35

LOL, fair enough. Some rims have the spoke holes offset so that you can build a rear wheel with more even tension, the stagger is when the holes appear to zig zag along the rim.

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ukdodger

26/10/09 15:39

5 forum posts

Quite right Mike. But in the link it says the spoke centre is a different thing from the rim centre. I dont see how that's possible.

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Mike Spence

26/10/09 15:51

Ah OK, the rim centre is always the actual centre point as measured IE: halfway. The Spoke centre is an average, IE: 2/3rds of the way across one spoke hole and the opposite on the next spoke hole, it shows it in the pic.

http://www.geocities.com/spokeanwheel/offset.gif

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ukdodger

26/10/09 17:09

5 forum posts

Ok now that's where I'm most confused - that diagram. What does it represent for a start. The left hand side of it with the spoke holes I'm seeing as the rim. The right hand blank side I dont get.

Also wherever the spoke holes are in relation to the rim centre so long as they are equal distances from it then the spoke centre must be in the same place as the rim centre???

ie: where 'O' is a spoke hole

Therefore Spoke centre - 'I'

And if the 'O's were on the 'rim' edge then the rim centre is in the same place. Correct???

Apologies if I'm being thick.

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Mike Spence

26/10/09 18:15

That pic is of a rear rim, like this Easton one.

http://www.eastonbike.com/PRODUCTS/TECHNOLOGY/tech_gen3.html

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John Gourette

26/10/09 18:17