We Have Explored Every Lane

Question

Riddle me this:

I am rotund and one with a barrow,
Though you must take out only the first,
In the name of the youngest pharoah,
Otherwise, my shape is accursed.

I can stroll and am two with a chair,
But again, you must take out the first;
Though this time it comes in a pair,
In which stillness cannot be coerced.

I will carry you and never tire,
For quite a long period of time.
My invention was vital like fire,
And I burn, too, but never through crime.

As with fire comes killing of air;
With a flame might come killing of wax.
But for me, I may come with a spare,
Though I also might leave with my tracks.

If you exchange only one letter,
Then the answer will be much revealed;
Though it must take somebody quite clever,
For a similar word has been sealed.

What am I?

The answer is just one word.
Can you find it? Hopefully.
Every line is a clue, none excluded.
Each paragraph is an explanation.
That includes the title — every line!

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Edit:

Added the word "much" to the second line in the last paragraph, namely,
Then the answer will be revealed
for the syllables match better when spoken, thus making the rhyme sound better too.

Answer 1

Partial Answer

I think you must be a

Wheel

I am rotund and one with a barrow,

Wheels are round, a wheelbarrow has just one wheel

Though you must take out only the first,
In the name of the youngest pharoah,

The first letter of Tutankhamun is 't' which, if we remove from rotund makes it round (thanks to Chris Cudmore for the suggestion in comments)

Otherwise, my shape is accursed.

I can stroll and am two with a chair,

A wheelchair has two large wheels.

But again, you must take out the first,

Removing the first letter gives heel

Though this time it comes in a pair,

Heels on feet usually come in pairs

In which stillness cannot be coerced.

I will carry you and never tire,

Wheels are used for transport (possible pun on the word tire)

For quite a long period of time.

Wheels generally last a long time.

My invention was vital like fire,

The wheel is often cited as the most important invention, it was as vital an invention as fire (pointed out by hyst329)

And I burn, too, but never through crime.

Catherine wheel

As with fire comes killing of air;
With a flame might come killing of wax.
But for me, I may come with a spare,

Spare tyre

Though I also might leave with my tracks.

Wheels leave tracks in the dirt.

If you exchange only one letter,

Wheel $\rightarrow$ Wheal

Then the answer will be revealed,

A wheal response is a red or swollen mark that occurs from firm stroking of the skin.

Though it must take somebody quite clever,
For a similar word has been sealed.

Wheal is very similar to wheel.

Title

We Have Explored Every Lane

Answer 2

Probably a bad answer, but you can be

tram

Explanation (very partial)

The name of the youngest pharaoh - Tutankhamun (he died at age 18) begins with T, like the word tram. Trams can "stroll" along the rails (namely, when they are heritage transport not intended for daily transportation), have chairs (seats) and can run in pairs (multiple-unit system). Trams carry passengers and can serve for long time (20 years or more). Invention of the tram was vital for mass transit, and trams burn usually due to technical reasons (not a deliberate arson). Trams run on tracks. Finally, "riddle me" can be interpreted as "ride a tram".