Hmmm What size are my grips?

I bought my bike off Craigslist so no owner's manual. I want to put new lock on grips but they come in 130 mm and 90 mm. How do I know which I need? The are stock 2005 Scott Women's bars if that helps. I am so confused what to even measure to determine the size!

It's the length of the grip. If you have gripshift, you'll want 90mm. Otherwise, if you have trigger shifters, you'll use 130mm.

Thanks Salsa! I seriously thought I needed to measure the circumference of the bar. :o I am blonde, I am an Aggie, sometimes I am not so logical. Hope I didn't offend any blondes or Aggies or illogical (is that a word?) people with that statement.

Now I can get my grips if I can just commit to the color I want. :D