tire width & rolling resistance

[Becky]

I really don't know what's available in 26". Is that the same as 650?

Nope. ISO bead seat diameter for 26" wheels is 559 mm vs. 571 mm for 650c wheels.

[Catrin]

Thanks everyone, Ms. Explorer is coming home from the LBS this evening so will ask about this. Probably not in my budget anyway unless my tires are showing signs of wear (I think they are fine) but it is worth considering. Hadn't thought about weight... I don't know if my wheels can even take a skinnier tire...