I am looking to get some new tires for my bike. My current tires are bontrager race lite 700x23c, on Bontrager Race rims. when I look at tires at some online shops I see 700cx23 or 700x23, but I have not seen 700x23c.

Could someone explain what the "c" means?

I don't want to get a tire that will either not fit or change the riding characteristics from being a different dimension. I understand that each tire has itsown characteristics but I want that to be the only change.