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Wheelbuilding for my R20s help :)

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Wheelbuilding for my R20s help :)

Old 07-06-11, 01:26 PM
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kamaleon
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Wheelbuilding for my R20s help :)

Hi everybody.

I would like to build 4 wheels for both my R20s using Sun CR-18 451 rims. These come with 36 holes.

I have a Shimano Alfine 8 hub I would like to use and a Nexus Inter-3. On the front, basic Shimano 36 hole hubs.

Would anyone care to advise about the lacing pattern I should use? I've never build any wheels and I'm doing this with the help of experienced mechanics, but they leave me on my own to make the decisions.

I'm concerned about the steep angle the spokes are probably going to have entering the rim. Or maybe I shouldn't? 2 or 3 lace is the question?

TIA!
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Old 07-07-11, 12:00 PM
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L8Guy
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Hi

I built alloy wheels for my 20, but used 406 rims with 36 holes. Check out this site:
https://sheldonbrown.com/wheelbuild.html

I was a complete novice starting the work on the 20, knew almost nothing about bikes since the last time I rode one was almost 45 years ago. But with help from Sheldon Brown's site, I successfully built the alloy wheels. I think I used a cross 3 pattern. The diference for me was that I re-used the original SA hub (IGH) on the rear and the original 20 hub on the front. Also, I managed to re-use the original spokes, since I just wanted to get the bike running as inexpensively as possible; maybe taking the next step later with upgrades etc. The mistake I made was not knowing that there was a slight difference in length from an internal spoke compared to an external spoke. As a result, I just took apart the chrome wheel and all the spokes were mixed up since they looked and felt the same length. (I couldn't mix front spokes with rear spokes since they are clearly different). The end result after I laced the wheel and tightened and trued the wheel, I found that almost all the spokes stuck into the rim a little too much. This was solved with a dremel tool grinding the spoke down. I put on Big Apple 2" tires (re-using the original tubes still in good shape). When project was finished, I took it into the LBS and had them do a general tune up etc. and had them check my wheel building skills. The tech there gave me an A minus !!!!!

If I can do it, anyone can. Good luck and have fun!
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Old 07-07-11, 01:33 PM
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kamaleon
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Lo, fellow R20 owner.

I appreciate your tale and your "naif ingeniousness" especially the part about calling the dremel to sort things out.

I'll let you know when I get these wheels done!
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Old 07-07-11, 01:35 PM
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mconlonx 
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If you can't get proper length spokes at local outlets, people pointed me toward Dan's Comp as a source for decent priced short spokes.

I laced a Sturmey Archer 70mm front drum and 2SC rear hub to Velocity AeroHeat rims. Used 3x pattern because that's the length of spokes I had; would have gone 2x if I'd known about Dan's Comp before ordering parts.
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Old 07-08-11, 02:26 AM
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jur
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I just laced a wheel 3x, to a hub which was 2x before. The spoke-to-rim angles are quite similar in those 2 cases. I don't think there is much to choose.
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Old 07-08-11, 05:29 AM
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kamaleon
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Ok,

following the advice of someone who has built a couple of 406 and 451 wheels with big-flanged hubs i've gone for 2 and have ordered my spokes... no turning back now. Will let you know how it goes...
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