sms wrote:

I believe that Schwalbe used to have a 27 x 1.5" but no more. The best
you can do now is 27 x 1 3/8 (37-630), i.e.
https://www.amazon.com/dp/B001C6DC1A. One review says that the width
is accurate.

27 by 1 3/8" is the widest that will fit, even with a little surgery.
Knobbies aren't really helpful in my application, everything is paved,
it's just that the pavement is wretched.

There are some NOS (New Old Stock) 37-630 tires on eBay.

I'm slowly coming to accept that 1 1/4" width is the best to be had.
My hope that somebody knew of a 1 3/8" slick are fading fast.....

Thanks to all for your counsel!

bob prohaska