Originally Posted by
meanwhile
It's a myth that carbon fibre posts absorbs road noise. CF damps free resonant vibration well - so it makes poor tuning forks. But road noise isn't this type of vibration; it's a succession of new impacts rather than an old one echoing in the frame.
Oh - and a seat post will be in compression, which is the worst case for killing even genuine resonant buzz, if there was any to kill.
But it would be a good idea to put the bike on the fattest tyres it will take and the pressure a little. On an Allez that probably means 25s instead of 23s. The OP could think about getting a hybrid or cyclocross bike for commuting, ideally one with a different riding position to his Allez.
Yep you're right. I wasn't thinking properly. CF has better damping properties so it doesn't ring like a bell as much as aluminium. The seat really sounds like the culprit here and compression of the perinium sounds right to me too.
I had that problem once years ago and changing the fit solved it for me. Get a different saddle and get fitted to it.
If the problem persists then you should seek medical attention. The numbness will go away after a while but the doctor will probably recommend that you stay off the bike for little bit until the symptoms go away.