Niagara has an ISO 520 tire by Panaracer in 24 X 1" for $18.80. Looks like Terry has the same tire. There may be a Specialized Nimbus for that rim, but all I find is a reference to the tire as 24" without details of what 24" size it is.

Looks like there are about as many incompatible 24" sizes as there are 26" sizes. What a mess.

Are the Terry Tellus tires (520 1 1/4") insufficiently smooth?