Tyre pressure - massive wheel load difference!?

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beany_bot

Veteran
So I am trying to figure out my optimal tyre pressure (28C tyres on a cross bike used for roads). I am 85Kg

I read the most accurate way was to weight each wheel as you sit on the bike (wheel load).
But I have a much bigges disparency than I see anywhere else online.
My weights were 58Kg on the back wheel and 38Kg on the front wheel. Which would (by most graph) give me a rear wheel PSI of 100Psi!! on 28C tyres! and a front PSI of only 60....
100/60 seems a bit weird? anyone try this wheel load thing?
 

ianrauk

Tattooed Beat Messiah
Location
Rides Ti2
You're thinking too much about it. Check the tyre walls. There should be 'inflate to min/max'.
Go for somewhere inbetween, ride and adjust for comfort.
It's as simple as that.
 

raleighnut

Legendary Member
So I am trying to figure out my optimal tyre pressure (28C tyres on a cross bike used for roads). I am 85Kg

I read the most accurate way was to weight each wheel as you sit on the bike (wheel load).
But I have a much bigges disparency than I see anywhere else online.
My weights were 58Kg on the back wheel and 38Kg on the front wheel. Which would (by most graph) give me a rear wheel PSI of 100Psi!! on 28C tyres! and a front PSI of only 60....
100/60 seems a bit weird? anyone try this wheel load thing?
You need to weigh both wheel weights simultaneously unless the bike weighs 31Kg :eek: your figures don't add up. Position on the bike alters weight distribution.

I'd say 100 rear 80 front was about right on 28s but I'm a touch heavier than you.
 

Venod

Eh up
Location
Yorkshire
85 psi rear 75psi front would be my starting point for your weight and tyre width, go for a ride and adjust as required, 100psi for 28 mm seems a bit high to me.
 

gbb

Legendary Member
Location
Peterborough
Ive never checked what actual pressures i run at....and i'm 61 ^_^
Inflate until hard using a press of the thumb into the tyre as a guage.. On rare occasions ive found the ride jarring, deflate a little.
 

CXRAndy

Guru
Location
Lincs
You could start with recommended max tyre pressure, then keep lowering 5psi until tyres feel just a little squishy whilst cornering. Then just add a couple of PSI

You could go upto 30/32mm for greater air volume and run lower pressure. Also tubeless is a fair bit lower too, see above method

I run 40 mm tyres at 50R 45F. but run 25mm at 90R 85F. My 40mm G Ones are so nice to ride and only slightly slower, I much prefer them
 
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