Tyre pressure discrepancy

[Seeker]

My riding friend and I disagree on tyre pressure values but I am not confident I'm right.

So here's the scenario: you buy a new bike and the manufacturer recommends "xxx" brand of tyre and fastens a label to your bike telling you the inflation pressures. Let's assume 33/36psi

Meanwhile, some time later you buy a set of tyres that the bike manufacturer hasn't specifically recommended and the tyre manufacturer recommends you run the tyres at 36/42 psi.

Hmm, that's quite a difference. So which is it? Bike or tyre manufacturer?

I have usually followed the bike maker but my friend says to follow the tyre maker and I can see his argument.

[Sir Trev]

To be honest I usually hedge my bets and go somewhere between the two. No scientific basis on that mind you. You've also got the consideration that your pressure gauge may not be that accurate, which is another reason for adding a few more psi than the sticker on the swing says.

Oddly enough, whenever I get my car back from a service they've always inflated the tryes about 10psi over the recommended, per my gauge.

[redtrummy]

Deffo the tyre recommendation for me. Our motorhome runs about 60lb/sq inch but is it that critical? Delivery drivers start with a full load in the morning, empty end of day - do they adjust pressures to suit, do they like heck

[glang]

Yes think tyre manufacturer has got to be the reference but saying that their figure must be for the worst case scenario ie. heaviest bike that tyre would be fitted to and two up with luggage so if your requirements are less demanding you could run them at lower pressures...

[R1ffR4ff]

Tyre pressures are only a recommendation/Starting point. As I let my weight get the better of me I added an extra pound to the front and a couple of pounds to the rear from the WSM 33/36 Lbs. As I'm on a weight loss kick I'll be dropping them to suit. If you see near the end of the life of the tyre uneven inner/outer tyre wear you may know if you have been running too low or too high.

A while ago I found these and have fitted them,

https://shorturl.at/KFFJi





As I do my own Tyre changes I also fitted a 90 Deg Valve which makes putting air in a doddle,




HTH