Does anyone know where I can get a Shimano rear hub FH-T780, and does it matter?
 

I only found the Shimano rear hub FH-T780 at one business online, and it's got horrible reviews. If there's anywhere else I can look, I'm interested.

I found another hub though that is actually available. In general, if you have two 36 hole rear hubs, by the same manufacturer, how much difference is there between spoke calculation measurements in them? Just in general? I was thinking if it's two 36 hole rear hubs, and the model is slightly different, those spoke holes are probably going to be in almost the exact same place. Is that generally true?

What got horrible reviews? The business or the hub.

Among other dimensional specs that drive spoke lengths are those of the hub. But we have no info about whether the two hubs are similar in flange diameter or flange to center (of axle, not shell) dimension.

Now, many hub manufactures use the same of very much the same above specs across a range of hub grades. Shimano is such a company. This is not to say that the two hubs you are talking about have these similarities, do they?

Have you looked into how spoke lengths are calculated? I suggest you do before spending any $. As often is the case Sheldon Brown's site might be a good start. Then go to the hubs and either measure or find the specs and go forward with this new info. Andy

I guess it might be generally true but it's never a guarantee. You need to know the dimensions of your hub and the dimensions of any new hub to consider reusing spokes. Hub flange diameter basically needs to be the same, center-to-left-flange and center-to-right-flange is less critical. Plug it into a spoke length calculator to check. I use Edd (Google it).

The business. I googled, and the reviews are found we nearly all horrible, even going back to ten years ago.