A friend just picked up a 1915 T. It needed new tubes so he bought 30x3 tubes with rubber stems for it. They don't fit, lots of extra tube when installed. What's up?
What size tires does it have?
He said 30x3.
You need to trim off some of the rubber on the stem or install metal stems;
Since you say there is too much tube, and Mark is focused on the stems, I think you need to post a picture to illustrate the problem... did your friend inflate the tubes too much before installing them into the casings? So, what's up is ?????
I guess I have seen so many post on the valve stem I jumped to maybe the wrong conclusion and maybe the tube is suffering from dun-lap disease.
It dun-lap out of the casing!
1909-18 Model T's are odd in the automobile world in that they have two dimensions of tires on the same car. Maybe your friend looked at a front tire, found the 30x3" dimension and now is trying to fit a 30x3" tube in a 30x3.5" rear tire?
Clincher tires are measured so the rim diameter is given by subtracting the tire width twice from the nominal tire dimension, thus 30x3 front wheels has 24" rims and 30x3.5" rear wheels has 23" rims
I haven't tried such a tube mismatch myself, so it's just speculation from my side, but maybe the tubes for 30x3 differs enough from the 30x3.5" tubes to give a problem?
I'll have to go over and check. We have an arctic front coming in and he jumped into his motor home and headed for Arizona! PK