Hope this can be easily answered by someone familiar with chain rings. I started hauling a trailer with this bike and now I definitely need to switch to a smaller set. The bike is a Jamis Coda Elite which came with a Truvativ Elita GXP, 30/42/52. Like the bike a lot - just don't have the legs to crank it. Want to switch the chain rings to 24/36/48. I've heard there are different styles of rings.....can someone direct me to something I can pickup on the internet. Thanks