New inner tube bulges near the valve when inflated I've installed a new inner tube in my wheel. I checked the tube doesn't make a knot. When I inflate the tube, it bulges near the valve, and this rubs against  the brakes.  



REF tube: 32/47 609/642

REF tyre: 42-622 700 x 40C

What could be the cause of this (wrong size of inner tube?) and how can I fix it?

PS: I'm not sure if it's a dup of Uneven inner tube when inflated inside the tyre?

Thanks.
Unless the tire bead (the re-enforcing wire around the edges) is damaged your tire is simply not seated on the rim properly near the valve and has popped off as the tube was inflated.

Tube size seems OK. 32/47  possibly means it's compatible with 32-47mm tires. If it's about the same as your old tube that it's OK. 

Deflate the tube and re-seat the tire. It's probably a good idea to get one side of the tire off the rim and make sure the tube is installed correctly too.

There are many good videos on YouTube that show correct procedure (try this one). but some key points:


Make sure the tube is not pinched between the tire and rim.
Make sure the reenforced valve area of the tube is pushed up into the tire
Make sure the tire is evenly seated on the bead all the way around. There is often a line moulded into the tire around the bead that lines up with the rim you can use a a reference.