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Does it cause any other problems if you just carry on and ride it into the ground?

the pedals are new. I replaced my old set when one pedal developed some play. I wanted to service them but they're shimano so a special tool is required, maybe one day I'll service them but I just replaced for now with an identical set, can't fault the m520s

I did ride for a few miles with the left crank a bit loose about a month ago so maybe that's worn something as you say Ben'sbb. I can try rotating the cranks thanks.

I remember the bb didn't want to go in square when I installed it, I don't know if there'd been some cross threading previously. It's been fine for years though...

hmm ok, i'll try tightening the pedal first. It's a shimano BB, into an old (90's maybe, I don't know) steel frame.

Before I take everything off and refit, does anyone know what this is likely to be?

When I push down hard on the left crank I get a creak just after it passes horizontal. If I pedal gently or with just my right foot it's nice and quiet. It's a fixed gear bike, square tapered cartridge bb which is around 5 years old.

I have an unused Bronx branded tyre which says 'inflate to 45psi' on it. I'm considering giving it a go at higher pressures (I usually ride with tyres at around 100psi), is it too risky?

why is that worse?

yes, it's fixed gear. I took the sprocket off and put a spacer on, I couldn't tell if made the chain line any different, it still looks good to me. I have had the same crankset, bottom bracket and rear hub for many years with no problems including many times riding where I'd let it get slack. I recently changed to a much larger chainring and sprocket, I don't know if that's got anything to do with it.

And thank you for the comedy gold above. Hopefully you guys will experience something similar in the near future so we'll have an opportunity for more laughs together!

The above was exhilarating but not something I want to experience again.

I'd let my chain get a little bit slack but I didn't think it was that bad at the time. The chain line looks good to my eye but what I'm wondering is does the direction a chain comes off the sprocket tell you anything about the chainline? ie if it comes off to the right (away from the wheel) you might benefit from a spacer at the back?