Bicycle Mechanics - Lacing a 32h hub to a 36h rim
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06-16-09, 09:30 PM
Is this possible? I thought it was by skipping two spoke holes on the rim. You would have to lace the top half and bottom halves of the wheel separately. Any ideas?
the fun part is calculating the spoke length required for that.
06-16-09, 10:11 PM
why not just buy a 32h rim? dtswiss makes some nice ones
06-16-09, 10:21 PM
You'll need 8 different spoke-lengths...
06-16-09, 10:50 PM
I wouldn't recommend it- assuming the rim isn't offset-drilled, you would still need to skip a hole every 8,which would leave 4 spots on the rim with no spoke. It would be murder to get it straight and tensioned and the spots with no spoke would be weaker. Better to lace a 32 hole rim to a 36 hole hub- then it's just a matter of getting the spoke lengths right. I once laced a 40 hole hub to a 36 hole rim- I needed 9 different spoke lengths (no dish on the wheel- otherwise it would have been 18 lengths). An interesting geometry problem.
Is this possible? Possible, but inadvisable. I'm no stranger to experimenting, but I wouldn't try that unless:
- I was desperate for something to do
- I couldn't get any other parts
- I really needed a wheel
- That rim is also available in 20-24 H drilling, to have some indication that it'd survive the increased span between spokes
- That the rim isn't drilled with a serious offset angle between spokes
I thought it was by skipping two spoke holes on the rim.
You "can't" skip two holes consecutively, you'd want them spaced out. but that means that half the wheel will be built with the spokes in lateral cross. Doable, but only if there isn't much offset in the drilling.
- The other way around is much safer, if a bit tedious to build
- Ride with extreme care and attention to changes
- Don't expect too much
- Assume full responsibility for your mismatched build
If I was desperate to use those bits I'd make myself a pair of adapter flanges. Basically two big washers, with two rows of holes. The holes closest to the inside edge would let the washer be screwed onto the the 16H hub flange while the outside row would hold 18 holes to match the rim. Might require some extra tweaking if it's on the DS of an externally geared hub.
06-17-09, 07:43 AM
First of all, you don't need 8 spoke lengths. I've done this with a Shimano high flange mtb disc hub and a 20" DX32 rim (temporary for a recumbent project if you were wondering), and I used the spoke length which was correct for 36 hole. However, you're going to have to do the hub in 4 groups, not 2 to avoid a huge gap in the rim. As a result, half of your spokes will enter eyelets on the wrong side of the rim. Also, it's going to look really bad and people are probably going to write you off as not being is the sharper half of the tools, no matter how good you are on a bike.
So, in conclusion, and having actually done this myself, does it work, yes. Should you do it, no.
06-17-09, 11:45 PM
Thanks to everyone for their responses! I appreciated the help. :-)
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