Hi H. You don't say where the spokes are actually breaking.
At the hub flange, or at the nipple?
Inside spokes or outside? Or both?
How many spoke crosses on each side?
If at the flange, then there are a number of causes -
1. Spoke elbow too long for the width of the flange.
Solutions: Use small washers at the elbow
Find spokes with the correct elbow length
to suit your hub.
DT did have a change, and some controversy.
Here's the link:
http:/www.peterwhitecycles.comDTspokes.htm
2. Spoke tension incorrect. If spokes are not tight enough,
the wheel flexes (side to side) causing the spokes to flex
i.e. bend back and forth a little where they exit the hub.
Spokes are very strong in tension, but don't last long
under such conditions.
IMHO, the 32 spoke wheel is stronger. Plus you will have 16
spokes pulling, not just 12.
If you were to hawk your wheel round to different bike shops,
you may get any one of the following responses:-
1. Just replace the broken spokes.
2. A full rebuild, same as before.
3. A full rebuild, using all new spokes, tight, no fancy lacing
or crossings, and no radial. Cross 3 or 4 both sides.
Number 3 option is the one you need.
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