Yes you can.
If it is tubeless then patch the tire on the inside. If it has a tube patch the tube.
the rear tire tube on a 70cc baja dirt bike is 3.0-12
pull the outer part of the tire off pull off the deflated bike tube replace it with a new bike tube put the outer part of the tire on
Put an inner tube in the tire.
The difference is that the mountain bike tube is much burlier and wider than the dirt jump tube but may not be as strong in terms of hard hitting strength.
A 20 x 2.25 tube
scarr says yes the difference is the valve most tyres are same same use tubless rim must be clean use tube any tyre correct size all good scarr
scarr says yes the difference is the valve most tyres are same same use tubless rim must be clean use tube any tyre correct size all good scarr
The rim will be down against the ground
You need one that match your tire size and your type of valve. The tire size is written on the tire sidewall. Doesn't have to be a perfect match in width, but the right diameter is fairly important. If the valve is the same type as on a car tire, then look for a tube with a "Schrader" valve. If it's a narrow thing, it's probably a "presta" valve.
A new tube, or a repair kit. You also need the required tools to get to the tube.
To rapidly inflate the tire/tube in case of a flat.