Inflating tires below the recommended minimum PSI pressure

Thanks folks

Sorry I'm a bit thick and its early this morning so struggling to do the sums. Please help.
I'm 80kg and ride 25c tyres. What pressures should I be looking at? Thanks

I'm using Vittoria Open CG Paves 27c at the moment.

The stated range on them is 110 - 130psi.

I think it's just the manufacturer playing it safe. I've no problems running 90/rear and 85/front.

Spectacular tyres by the way if anyone is looking for a qualility winter tyre.

Fairly unscientific, but I pump front/rear to 90 PSI every couple of weeks, I've not had a puncture in the last 18 months since I started riding again. I'm fairly light at ~63kg so that may be a factor - my old boss used to flat every couple of weeks and he was a fair bit larger than me.

It's not about bulging its about bottoming out and you can only feel this by riding on them. Try 85 psi one ride then 80 the next until they feel too sluggish or you bottom out on them.

How much do you weigh?

I inflate my tyres according to the 15% drop principle - the pdf linked above. For my low weight and 25c tyres that's about 90psi rear and 60psi front. Shocked? Yes it's less than the stated range, but the ride is just dandy. No punctures.

http://www.bikequarterly.com/images/TireDrop.pdf
check this out

110-125 psi seems a very narrow range. My 25mm Durano (and Vittoria Rubino Pro before them) work well for me at 60-80 psi, I don't know what the sidewall says.

I would try a short test ride at 85 front & 95 rear, see how it feels. The main risk at low pressures is probably pinch punctures.

I run 700 x 23 Specialized All Condition Armadillo Elites on my winter bike. As its dirty and cold I often go a fortnight without pumping them up. They are sometimes at 60psi by the time I get to them. Never had the slightest problem, even with energetic cycling and hard cornering on much less than ideal surfaces. If you really do push it hard on an off camber corner just for fun they start to give way very gently leaving plenty of time to correct. Try 80 front 90 rear and relax.

If you want to do the pressures by the book, look at this, you'll be surprised how low the optimum pressure is on 25c tyres:

https://janheine.wordpress.com/2010/10/18/science-and-bicycles-1-tires-a...

I run Vredestein Fortezza Tricomp 23mm at 90/95 and Vittoria Open Pave 25mm + Hutchinson Fusion 3 23mm (tubeless) between 80/85 and 85/90 - never had an off moment as far as tyre integrity goes, the Open Paves could probably go a fair bit lower if the surface warranted it.

Yes, I like them. They are wearing well, even through the winter. There is a new version with better puncture resistance.

As long as the tyre doesn't bulge too much at the bottom I doubt the tyre would roll off the rim. I use Schwalbe Durano 25mm and run about 95-100 psi. Your other option is go 28 or 32mm if your frame allows.