The chunky cars are great. Toot toot are OK but the wheels are a bit fiddly, I prefer the Happyland or ELC magnetic or Fisher Price Little People cars, for a better size. The plastic chunky Tonka Trucks are also really great. There are also some really good wooden cars from companies like Haba. They have a more stylised look but they do the job and DC enjoy them.
Too young for balance bike IME, but it's a great age for a wheelybug or that one which looks like a bug eyed spider with four legs, I forget the name. The key is wheels which swivel, so they don't have to line it up to change direction, which they find tricky. You also need something that doesn't fall over when they lean on it at this age as they aren't very stable even if they can walk.
Push along walker is the absolute key 1yo birthday present! Or a wooden truck, preferably with a set of blocks inside :)
Mega blocks also went down fantastically well - Duplo is too stiff at this age, but wooden blocks are frustrating to build with as they lack the dexterity to balance things (they enjoy bashing them together to make a sound, or putting them in and out of things :))
Also anything involving big balls (ball pit size) that you put into tunnels and things is a big hit. And anything you can put inside other things, like a shape sorter or stacking toys.
If you have the space, something like the curved boards they can crawl over, climb on and practice balancing are also great fun, but they do need a big room IME.
Also loads of board books! This is prime board book age, especially anything with sounds or textures to feel, and lift the flap if you don't have a child who likes ripping/can store them out of reach.