Well if all you did was change the tire, the fault lies there. You might have lost a weight, or not balanced well. Another cause could be a defective tire. I had a tire cord/belt go bad on a car tire once and it felt like it was out of balance. The defective belt lets the tire stretch and become out of round.
2005 1100 Custom
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
Wimmer Machine Custom Oil Cooler & Stash Tube
Dyna 3000 Step 5/ 6500 redline
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front
10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...