Ok I am used to a hybrid boardman with non resistant tyres but I am getting wound up about my mtb tyres!!
Recently got an orange g3 and notice the mountain king tyres have a max of about 65psi which I have pumped the tyres up to for better road rolling but the mavic rims call for a max of 49psi , what am I to do. 49psi on these tyres make the tyres look almost flat when full weight is bearing down on the road. I am 14 and a half stone! Whats your advice. Oh and by the way first time off road on trail and two fields in got a flat on these tyres. Shall I keep them??
I've run tires harder, no idea what the rim limit was. That's a lot off road tho.
If you are getting pinch punctures maybe get a bigger tire?
14.5 isn't that heavy, I'm 12.
Stick about 30psi in them, go ride, try not to overthink these things.
Get a digital pressure gauge too. You'll be suprised how far out your pump gauge is. Mine was 27psi out, my mates 25psi. When you consider that tyres are designed at certain pressures, and chances are they are not getting pumped up enough, it makes a huge difference to grip etc getting them right. 🙂
I run mine between 8 and 12psi, works a treat
I'm 16 stone, you're a lightweight (or possibly I'm a fat bar steward)!
There is somewhere on the web that shows the relationship between tyre pressure, tyre width, riding surface, and load (which may be different front to rear).
I run 53psi front 80psi rear with my mixed terrain 1.95" width tyres on tarmac, dropping to 30 front 45 rear on my 2.25" Schwalbe Alberts off-road.
49psi?
LOL!
I run 28 on the front and 31 on the back and I'm 12 stone. I don't get pinch flats (well rarely). If I go above 35 psi the back end tracks like crap over roots, god knows what 49 psi would feel like.
Wow.
I run 25 psi front and back, never get pinch flats, get great traction and comfortable ride on MK 2.4, tyres don't look flat, I am 14 stone.
On my Supermotos on road I run 40 psi, that seems hard to me for that size of tyre.
I hate to think what a knobbly tyre feels like on a hard surface at 50 psi! Or an off-road surface!
Can't believe the gauge is out 25 psi! So what is it doing, showing 25 psi over? That's not 'far out', that is broken 😆
At your weight try 32 front 35 rear as a starting point off-road, issues with pinch flats or tyres folding, in turns go up 2psi at a time until fixed. For the road you should get away with 65 with pretty much any decent tyre and rim combo.
A formula you see quoted - Your weight in lbs divided by 7 (or weight in stone divided by 2 obviously)- add one for the back, take one off for the front.
Does not take account of tyre width which seems strange to me from a road perceptive. Or trail condition too.
edit - scratch that - that might be formula for tubeless, can't remember the adjustment for tubed.
Lol you still have time to delete the entire post and save face 😉
h1gg1 - MemberOh and by the way first time off road on trail and two fields in got a flat on these tyres. Shall I keep them??
Well they are ****, to be fair. Conti do make some good tyres but their OEM-spec ones are like something from the 90s. They do the job to be fair but then so does anything.
Tyre pressures are totally about taste, riding style, riding location, your weight...Just fanny about with it til you find what you like.
Lol you still have time to delete the entire post and save face
😀 Never post when half asleep!
the actual [b]tubeless[/b] formula from stans notubes...
To determine a starting tire pressure when running mountain bike tires tubeless on our ZTR mountain rims use this simple formula:Rider weight (with gear) in pounds divided by 7 = x
x - 1 = Front tire PSI
x + 2 = Rear tire PSI
If you weigh 14.5st and your tyres look flat at 49psi, either your scale or your pressure gauge is wrong.
Went out on sat for a good thrash round hayfield.
Tyres stood up good at 50 psi so will stick with this.