Please don't put words in my mouth, especially when I didn't say them.

I said the OPs problem was related to the base of the valve being too high, and the tube blowing back under the reinforcement. Rim width and valve hole size are factors, but at no time did I suggest that the tire width was.


To the OP, the key is pulling the valve all the way out. Before even mounting the tire try pushing or wiggling it through until the base touches the rim. If the hole in the rim tape is too small, enlarge that, if it's the valve hole itself, ream it a bit bigger (just enough and no more) or let a bike shop do it if you don't have the tool.

Once you address the valve problem, you can stay with your tires if you wish, but I suggest buying the largest tube that fits the tire, so it stretches less, and has more reserve for the added stretch at the valve area.

There may be reasons to go with smaller tires, but that's a separate issue entirely.