Frank S

Dunno if this is the right place.

My 1987 Trek 520 was originally supplied with 27"x1 1/4" tires. I changed them out for 1 1/8" tires, almost immediately, and have used that size ever since. With the current supply shortages, I feel lucky to have been able to find 1 1/4" tires.

The rim inner bead width is 16.5mm and the tire inflates to 34mm. From what I read this is suboptimal, but not outside of a useable range. I'm running Michelin Protek tires at 65psi. front and 70psi. rear.

What I'm experiencing is a tendency, of the bike, to "fall into" turns. If I turn at a leisurely rate, the bike steers predictably. But, if I turn a bit sharper, the bike seems to turn sharper than expected.

Is this tendency being caused by using too narrow of rim width? Too low of inflation pressure, instead of the manufacturer's recommended and rock hard 87psi? Or, is it all in my mind?

Thanks for any help, or movement of the question if it should be elsewhere.