What is the proper tire inflation. 3.5 x 30 ?
I use 55-60 lbs.
Some people say 50 psi is OK for clinchers. Others say 55. I use 60. If they're not good and tight, they can rotate on the rim and shear off the stem. That will really slow you down.
Newly made 30 x 31/2 says on the side wall
65psi. That's what I run all the time in the clincher tires.
A couple of summers ago I watched my rear tire pass me. From then on I use 60 and check before every trip
Ford: 60 lbs front and 70 lbs. rear
I started using 60 at first but because my '19 Runabout has what seems to be a fairly stiff suspension for a T, I now run it right at 55 and check it frequently. This is with tires more than half a century old. 60 psi might be better with the softer new tires.
The tire pressures indicated on the tire is for maximum load if you are not at max load the pressure can be lesser.
All of the period treatises say 20 pounds per inch of tire for clinchers. So, 30X3=60 pounds and 70 pounds for 30X3 1/2.
had my first stem sheer off today. lesson learned.
Just because of curiosity Michael - at what pressure was the tire before the incident?
The manual for my 26 roadster with wires calls for 27 psi. Why the difference? PK
Pat, the 21" tire is a balloon style tire with a a modern bead. I run mine at 35 psi.
Thanks Dave, PK
Hi Dave...not sure, but it was low. I could see that it was, but wanted to take a quick test drive with my son around the neighborhood. Hard lesson, but no damage.
I use 70 psi. Never had a tire move on the rim yet.
Using a metal valve stem with the bridge nut against the felloe will keep the tube from rotating within the tire.