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When pedalling under 'normal' load on my road bike with stock Giant P-SL wheels I occasionally get a twang type noise coming from the back end. It doesn't happen when soft pedalling or when under heavy load such as climbing out of the saddle or sprinting.
Any clues?
Either loose spoke(s) or you have a ukulele caught in the back wheel...
What he said, sounds like you need to re-tension your back wheel.
Had a quick check of the spokes and they 'seem' ok to running the fingers over them, I'll have a little dabble with a spoke key.
Check your free hub sounds like a pawls are not engaging right, strip clean rebuild it
Ah bugger, I thought it might be that as when you spin it, it sounds a bit like there's something not quite engaging properly.
Are DT/Giant hubs easy to do
DT hubs dont have pawls... they use a twin star nut thing...
does it make the same sound if you lock the back brake and rock the wheel back and forth?
Don't know, I'll check
Depends on which DT hub as to whether it has conventional ratchet and pawls, generally they're Onyx or similar if it's OE, and have pawls operated by a thin wire spring. This type isn't very tolerant of sticky, or dirty grease, so a good clean out may well get it all running nicely again.