Can i put new tape over old tape in a road bike handle,?

Sure you can, if the 1st tape is thin. I did this for a friend of mine it worked fine. Wrapping a bar well takes a little practice but certainly can be done by most anyone. If you think you'll mess it up have a knowledgeable friend do it or yes, even take it to the shop. EDIT: Fleutz... you remove your shifters to wrap your bars?

go to bike store I tried once to do it but ran into a snag Tigra Shifters couldn't move them so I stopped and found those shifters need a special tool to remove them. So be safe not sorry get a professional you don't want a $75 headache

Do it urself, it isnt worth the trouble to go to the bikestore. It should b fine 2 put the new tape over the old tape. I dont c why not.

yeap do it yourself and in fact the handlebar will end up a little ticker and is more comfortable. carlos http://www.bikingthings.com

If it is cork or gel tape the only issue would be thickness after two layers. You can only try it and see if it's comfortable to your hands. For me it works great.

Best thing to do is to put the old tape over the new one. This way the new tape will stay new, longer..

Do it yourself! And if you take your time and do it right, it'll look great too. Unfortunately one size fits all doesn't work for handle bars any better than hammers, gloves or shoes. And like my hammers, pipe wrenches and such smaller diameter handles that need a positive grip so as not to cause wrist stress through repetitive motion or lack of grip, I pay as much attention to the underlying layers as the finish layers. Slipage is not a good thing when it comes to safety. Old fashioned friction tape might be good to increase the size even further initially before finishing. I might suggest some good fitting gloves for protection as well. That's something you can check out at the bike shop for. It could determine the difference between pink and purple. Or how friendly the ulna is with the rest of our hand.