drystonepaul":1mj37kg6 said:
I agree that £20 is a bit steep to fit a replacement.
I disagree - if it's a drive-side spoke in the rear wheel, you've got to remove the cassette / freewheel, often you'll need to remove the tyre and rim tape (unless you can re-use the nipple in place), then replace the spoke and re-true the wheel radially and laterally. This is usually not just a matter of returning the replaced spoke to the original tension, especially if the wheel's been ridden with the broken spoke for a while. Then you've got to replace the rim tape, tyre and tube, re-fit the wheel and check the brakes are working.
That probably averages about 20-30 minutes per job - some jobs may be quicker, but some will take much longer if you've got seized nipples, other damaged spokes or the wheel's really knackered. £40 an hour for workshop labour is not unreasonable, it's certainly quite cheap for a London workshop.
Just because you have a go at the job yourself, in your own time, doesn't mean that someone else isn't justified in charging money to do it quickly and properly.
OK, rant aside (sorry about that), Sheldon Brown's website is excellent as ever on this - have a look at
http://www.sheldonbrown.com/wheelbuild.html, although I've got to say if I bought a wheel off eBay and it wasn't described as having missing spokes, I'd send it back and ask for a refund. It's not complicated to replace spokes but it is a process that requires a bit of skill and certainly a bit of time if you haven't done it before.
Hope this helps.
: P