I'm about to build a wheel with a Shimano 7-speed hub w/ roller brake. My past efforts at using online spoke calculators with other hubs have resulted in errors in spoke length, which leads me to believe I had messed up the hub's dimensions. So my spokes have usually ended up a bit too long and I have to file them down (if I'm lucky) or buy shorter ones (after building the wheel up, which is no fun).
Shimano's website gives the full specs for their generator hub, but not the 7-speed. I know the over-locknut is 130mm, and from what I can measure the flange diameter is 85mm. From there it gets iffy...
So if any of you fine folks with Nexus wheelbuilding experience could give me the correct numbers it would be most appreciated! Oh, and the rim is an Arraya with an ID of 540mm...
I'm about to build a wheel with a Shimano 7-speed hub w/ roller brake. My past efforts at using online spoke calculators with other hubs have resulted in errors in spoke length, which leads me to believe I had messed up the hub's dimensions.
Hmm. I use Damon Rinard's spocalc.xls spreadsheet, and built up a nexus 7-speed hub with no trouble. It lists S dL WL dR WR 2.6 87.0 31.2 87.0 23.5
where S=flange thickness, dL=left flange diameter, WL=left flange offset from center, etc. Worked for me.
--
David L. Johnson
__o | And what if you track down these men and kill them, what if you _`\(,_ | killed all of us? From every corner of Europe, hundreds, (_)/ (_) | thousands would rise up to take our places. Even Nazis can't kill that fast. -- Paul Henreid (Casablanca).
My measurements for the hub are pretty close to yours (within 2mm). The spoke calc tells me I need 252 on the left side and 251 on the right, so I'm in the ballpark fo what I had previously come up with. Think I can get by with 252 all around? ;o)
I should say that this is the first time building with this hub. It was with other hubs that I had made errors in the past.
