brockd15 

I've got an '83 Schwinn Voyageur SP that has 27" wheels, 36h in front and 40h in back with a 5 speed freewheel. I'd like to keep the 27" rims and go to a 9 speed cassette, but it can be a tough task finding a 40h rear hub without going with Phil Wood, White Industries, Chris King, or something similar that are more than I'd like to spend. That being said, I have found a Shimano HF-05 tandem hub that will accommodate a 7 speed cassette. Are there any issues with just swapping out the freehub with one that will accommodate an 8/9/10 speed cassette? From what I can tell it should work fine, but if anyone has done it it would be nice to have some confirmation.

I know I'll have to respace the stays (I've done it before), remove spacers from the hub to bring it down to either 130 or 135 (or respace stays all the way out to 145), and either cut or replace the axle with a shorter one (unless respacing to 145).

Any other thoughts or suggestions are welcome too.

DannoXYZ 

I don't think that hub uses the same freehub design as regular Shimano. So you can't put a 105/Ultrega/Dura-ace freehub on there. Might need to stick with 7-spd or get the FW8968 freehub (pricey).

dabac

If the HF-05 has the same freehub body interface as (almost) all shimano hubs, then the only issue with the change is to get the seals to line up right. The're somewhat different between 7-spd and 8/9 spd. On those occasions that I've done that swap I've used donor hubs just to get all the bits.