Minion Posted November 10, 2011 Posted November 10, 2011 Ektually, tyre pressure is determined by a dynamic process called "sag" (also known as tyre drop), similar to the way you set sag in a MTB suspension. So the tyre manufacturer will have an optimal sag for each tyre they produce (typically 15%) and it is up to the user to attain that sag percentage. So rider weight is crucial as well as wheel loading (front/rear bias). There are ways of measuring wheel load to assist with getting the right tyre pressures, but front is always lower than rear.Sheldon Brown had a rough table of pressures based on wheel loading and tyre width here:http://www.sheldonbrown.com/tires.html His recommendation for a 77kg rider on an 8kg bike with a roughly 40:60 weight distribution is 100psi in front, 120psi at the back.
Dubber88 Posted November 10, 2011 Posted November 10, 2011 Sheldon Brown had a rough table of pressures based on wheel loading and tyre width here:http://www.sheldonbrown.com/tires.html His recommendation for a 77kg rider on an 8kg bike with a roughly 40:60 weight distribution is 100psi in front, 120psi at the back. Thanks Ed and Fitter, Now that was the kind of answer I was hoping for. I will definitely use that recommendations as a starting point next time I go and ride.
gummibear Posted November 10, 2011 Posted November 10, 2011 Sheldon Brown had a rough table of pressures based on wheel loading and tyre width here:http://www.sheldonbrown.com/tires.html His recommendation for a 77kg rider on an 8kg bike with a roughly 40:60 weight distribution is 100psi in front, 120psi at the back. Thanks,some interesting things there.
Garfield2010 Posted November 28, 2011 Posted November 28, 2011 What are the best tyres as well as tyre pressure to not get punctures for a guy weighting around 85kg's? Budget is around R1,200 for both tyres............. Thx
The Drongo Posted November 28, 2011 Posted November 28, 2011 Road or mtb? That, IS NOT, what I meant.
Redlight Posted January 11, 2012 Posted January 11, 2012 Tire pressure and the width of the tire is linked to each other.. Tire profile and pressure is linked to each other same as car tiyeerrrs the lower the profile...the harder you gotooo pomp it...nothing to do with the width.. its about using the air as a spring
rudi-h Posted October 31, 2012 Posted October 31, 2012 A wheel load of 50kg and a width of 50 mm should be pressurized at 3 barFrom this you can extrapolate the required tire pressure for your wheelsIe.At 50 kg and width of 20 mm pressure should be 8.66 barAt 35 kg and width of 50 mm pressure should be 2.33 baretc, etc, etc. Can you reference this information. Just asking because to model the behavior of compressed air is a very complex field and to assume linear correlations seems a bit sketchy. Where does the 50kg for 50mm come from, is this a common rule? Not trying to have a go at you, I just would like to assess the value of your post and whether it is based on solid theory.
Let's Ride Posted October 31, 2012 Posted October 31, 2012 I used to pump my tubbies up way too hard. I weigh 85 kg's and pump my rear to 120 psi and front to 115 psi. For every wheel set.
Shaunvz Posted September 18, 2014 Posted September 18, 2014 Hi guys. Does anyone know if its possible to repair a tubeless road tyre that has a hole in the middle of the tyre surface? The hole was obviously to big for the sealant to work. Its an expensive tyre so before throwing away thought I'd check?
Shaunvz Posted September 18, 2014 Posted September 18, 2014 Can I use a plug? Will it hold? New sealant also
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