2 year old skilled bike rider. Is this normal?

My granddaughters both learned how to use their balance bikes (without 'training' wheels) as soon as they could fit the bikes. It wasn't quite at a year, but less than 2.

She is very intelligent.

I guess I would be more impressed if they weren't using supporting wheels... It makes sense that the moment child learns to walk they should be able to get on a bike. 

Except for God gifted, otherwise abnormal. 

I was 8-years-old when learn to ride a bike. Not falling off or using training wheels. It feels my body knows but my mine didn't.

I've seen a few very young kids who really COULD ride a bike (without training wheels). It's not common, but there are some.

I don't know if it's uncommon but my son learned to walk around 10 months old, and he was running after older kids at his 1st birthday. I started him on a small tricycle shortly after. Simply putting his feet on the pedals and letting him roll down our walkway to the sidewalk. A month later, he was pedaling it. Just before he was a year and a half he was pedaling to the end of the block with me daily.  His little brother did the same thing. Both of my sons were pedaling without training wheels before they they turn 3.  I think that it depends on their exposure and what  their parents are willing to do with them. If it is uncommon, it's due to their parents not teaching them. Trust me. Most people underestimate kids. 

What skill?

Realizing that continuing forward isn’t going to be possible?

That isn’t much more than proof of eyesight and a fairly basic level of intelligence.

Being able to sit on an inherently stable item w/o falling off?

Even chickens manage that.

A 2 year old is neither "skilled" or a bike rider.  Some 2 year old kids may develop faster than others.  A "skill" means competent excellence in performance; expertness; dexterity.  https://www.dictionary.com/browse/skill  No way a 2 year old will have the same "skills" as  professional rider.  

Neither is it a true BI-cycle.  "BI" means two.  A bicycle with training wheels has four wheels.  I fail to see your point.  That a 2 year old can negotiate a turn?  That's not a skill.  That's called LEARNING.  German cyclist Viola Brand has "skills". 😲 https://youtu.be/D04tgM04I1A 

That is not a bike because of the training wheels. It is more like a tricycle. I rode a tricycle as a kid until I was 8 years old, when it was stolen. I had to learn how to ride a bike when I was 10 years old. I learned it in less than one day with the help of a friend, but knowing how to ride a tricycle did not mean I could ride a bike without learning. I could not hop on a bike and start riding without learning simply because I knew how to ride a tricycle.