Check my sentences please

1 & 2 are correct.
I don't understand 3 at all.
4 Here, "backside" sounds odd to my American ear.

Thank you for replying Philip.

3. I am on a small lane. My friend asking me to go inside. I replied, I can't go more inside than this.

Thank you.

#3 now makes some sense in that very restricted context, though I think 'in' is more likely than 'inside', and 'move in' is even more likely.
#4 makes no sense at all to me.

Thank you for replying fivejedjon.

4. My friend was sitting and asked me. Where is Jhon? I replied, He is your behind. Now is usage of behind correct?

Thank you.

Your behind implies the rear-end of a person, the ****, so to speak. You want the preposition: He is behind you.

3) If you are biking on a small lane, then say, "I can't get any closer to the curb (edge) than this.

4) A backside in American English is a derriere. I don't think you mean to insult your friend that way.

Say: he is riding beside me. He is riding behind me. .

2. What is the meter reading of your bike?

'Meter' is not a natural term here.
odometer tells how far you have ridden
speedometer tells your current speed

Clive

shravanmmThank you for replying fivejedjon.4. My friend was sitting and asked me. Where is Jhon? I replied, He is your behind. Now is usage of behind correct?Thank you.

No, you sit on your behind.

Say:

John is behind me.