himespau 

Does anyone know of some repository that has listings of all the crucial dimensions for shimano hubs? For reasons that are not all that interesting to get into, I'm considering unlacing a wheelset that I built with one set of hubs and re-lacing it with a different hub set. Particularly, I'm interested in knowing whether I could use the same spokes if I removed an older shimano hb-1056 rear hub and threw a 6700 rear hub on there in its place. Yes, I could hunt down the calipers and make some measurements, but I thought I'd try the lazy man's approach to look for numbers first to see if it's worth considering.





If you really need to know why I'd want to do such a silly thing, basically, a couple of years back I built up a wheelset using NOS 105 SC hubs for a commuter bike that I'd planned but never got around to building. Life intervened, and it got away from me for a couple of years. It came to mind the other day that maybe I should go back to that project about the same time I saw a smoking deal on a shimano 3N80 dynamo hub and snatched it up. Since I had a lightly used 6700 rear hub floating around from a different project, I thought I'd see if I could swap out the hubs, save the matching 105 hubs for a different project, if possible re-use the rear spokes and only have to buy 32 spokes for the front wheel. I know some people don't think reusing spokes is the best idea but these have been built up, and stress relieved but never ridden, so, if the rear ones would work, they'd essentially be almost new. And yes, I could buy new rear rims and just build a second set of wheels, but that seems a bit wasteful, especially as this is an odd build - lacing up 130 mm rear hub to 26" rims for an old mtb that I've put drop bars on and made into a heavy duty commuter bike.

Jeff Wills

In my experience, similar Shimano hubs, no matter the era, have similar dimensions. A FH-1056 hub and a FH-6700 hub will be within a millimeter of each other- close enough for government work.

Fred Smedley

Edd, an easy to use spoke calculator

This has a lot of them.

himespau 

That was kind of what I was figuring/hoping. Thanks.

himespau 

I'd tried this before posting (it's where I got the specs for a different build) and it didn't have 1056. Tried it again after your suggestion and found it did have the 1055 rear hub, which is the 7 speed version of the one I have. Like Jeff suggested, it's only 1.1 mm different from center to left flange (and 0.3 mm center to right), so I'll probably figure that's close enough to give it a try once I get the time.

zacster

I was having the same issue, except with MTB hubs. The particular version of my LX hub isn't listed anywhere I can find, yet is ubiquitous on bikes from that era. I just used the dimensions from a later version and it was fine. I have since checked on the modern versions of LX and they still give me the same spoke lengths in a calculator. The slight variations in size don't make much of a difference.

And yes, I was looking for the same reason. I bought a 3N72 dynamo hub that I built a new front wheel with, and wanted to match the rear.

Dfrost 

spocalc has a good database of hub dimensions.

Fred Smedley

"Edd is spokecalc.xls rewritten as a web application." quoted from the EDD FAQ