I thought I had a slow puncture but it seems to be the UST rim rather than the tyre that’s the problem. There is no visible damage to the rim and I’ve also changed the valve – anything else I can try (don’t say a tube)?

where is the air coming out- through the nipple things? Maybe rims got wee crack in it? Mine leaked a bit through edge of the valve in first bow up but sloshing stans stopped that.

It’s hard to say scruff as it deflates slowly over a matter of days. The front doesn’t though so I’m just curious really.

Covered it in soapywater for leaky bubbling location?