Introduction
This guide shows how to remove and replace an inner tube of a tire. This process may difficult he first time it is attempted.
Tools
Parts
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            Remove the flat tire by loosening and removing the axle nut with a 19 mm wrench. 
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            Unscrew the axle bolt with a 19 mm socket wrench. 
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            Remove the axle bolt from hole and remove the wheel from the wheelchair. 
 
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            Insert the 19 mm socket wrench between the rubber tire and the metal frame. 
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            Carefully run the 19 mm socket wrench along the edge of the tire all the way around and bend the wrench down to pop the tire out of the rim. 
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            Reach inside the tire and remove the tube from the metal frame. 
 
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            Working all around the tire, carefully push the tube back into place inside the tire. 
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            Finally, push the tire back into place on the metal frame and inflate the tire. 
 
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            Insert the axle bolt into center of rear wheel. 
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            Insert the wheel with the axle bolt into the lower back of the frame. 
 
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            Screw the bolt on the outside of the wheel with a 19 mm socket wrench. 
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            Screw the nut on the inside of the wheel with a 19 mm wrench. 
 
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To reassemble your device, follow these instructions in reverse order.