N.L.
A bike was easier for my son than the tricycle. We got him a 12 inch bike from Toys R Us. It was put together and everything for $40. It has training wheels too. He picked it up right away at age 2. It's great exercise for them! WalMart also has little bikes too. I know lots of people who started their kids on bikes at 2. Go for it! Just get a helmet, we had a few crashes at first.