Topeak Track Pump - Gauge Correct?

I have a Topeak Joe Blow Max II Track Pump and used it today to pump up / check the pressure of the tyres on my new road bike. I had 110psi in mind for the rear but it suddenly became hard to pump past 60psi and the tyre felt quite hard. Is this normal and am I supposed to pump on to 110psi? It just felt like it would explode if I even reached 70.
I've ordered a £10 digital gauge to double check before I do this but thought I'd ask you knowledgable people while it's in the post
I've ordered a £10 digital gauge to double check before I do this but thought I'd ask you knowledgable people while it's in the post

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My mtn bike tyres go to 40psi with the same pump. I guess it should be showing about 80?
Don't think there's anyway to calibrate it
My Joe Blow pump gets a bit harder past 80 psi on the bike tyres, but all mine are 25s so that's as far as I want to go
I think it is very sensitive as to how it is positioned on the tube valve, which is quite annoying.
I am sure if positioned correctly that the gauge will be accurate, but getting it positioned correctly is the problem.
Pumping up to 110psi does seem hard but it does get there. I am pumping 25c tyres. My Dad has a high end decathlon pump and this does take less effort and feels 'nicer'.
Another thing I noticed with the Topeak Joe Blow Max II Track Pump is that trying to 'top up' tyre pressures in nigh on impossible unless I deflate the tyre under 80psi. I have to violently push the plunger down to break the seal at 80psi or therabouts.
Does anyone else have this top up issue with other pumps?
Seems as though it is not their best product.
I have this issue with my Joe Blow pump - have to deflate to inflate, when all I want to do is top up.
rear 60psi
front 80psi
So the Topeak appears to be showing the correct reading afterall, however the tyres feel hard and I don't appear to be able to pump them up further. Am I supposed to follow this advice? Which seal are you referring to?
Being a newbie to road bikes, I'm scared the tube/tyre is going to explode if I go crazy with the pump.
I didn't go further as I'm not sure of my ideal pressures - I only weigh 68kg. Need to do some research.
Hopefully I'll now go faster than I did this morning when the rear was only at 60psi.