When the lowest gear isn't low enough

[Becky]

I've just counted the number the teeth I have 11-23.

What does that mean then?

It's good news It means that you have what amounts to a higher-geared racing cassette, and there are plenty of options for lower-geared cassettes. You should be able to get something like a 12-25 or 12-27 pretty easily, and I think SRAM might even make a 11/12-28.

When changing cassettes, just make sure that your rear derailleur can handle the bigger cog and that your chain is long enough. Your shop can definitely help with this.