Originally Posted by S_D
How does one know the condition of a front hub? Spoke are solid, spins freely etc anything else to check? (Going to look at a 2nd hand wheel hence the question)
Hold the axle and spin the wheel - should be silky-smooth with no roughness (or minimal, consistent "texture" if it's a cheap wheel, but I presume you aren't going to buy a wheel that cheap on the secondhand market).
Check the rim is straight, with no hops or dents, as well as no sideways run-out.
If it's a rim-brake wheel, check the brake tracks for wear - there may be a rut worn into the centre of the brake-track (if so, leave it, unless it's really cheap).
Bring a spoke key and turn a few spokes a half-turn open (and then turn them back, to avoid messing up the trueness) - if the nipples are seized or part-seized, walk away. Another sign that the nipples may seize soon is a lot of corrosion (white bloom on the aluminium) under the rim-tape - don't buy a wheel without seeing under the rim-tape - if the seller doesn't want to take the tyres off, walk away.