k i need to attach a cat carrier to my bike so i can take my cat with me when i ride cause she like to be outside but she can't be an outdoor cat cause the neighbors cats start fights
Please don't attach anything cat to your bike. It's very unsafe, and just because she likes to be outside doesn't mean she's going to like moving 15 mph, 3 ft off the ground. If you really want to let her outside, put her on a harness and leash, and watch her so she doesn't get hurt by other animals. Truthfully though, she'd be a lot healthier if you just kept her inside, safe from harm. Hope that helped.
Please do not do this. It's a really bad idea for many reasons, one of which is that you're smart to keep her inside, but the more you let her see of the outside, the more she might want to go out there. Also, there's no way she would enjoy this.
On my bike I have a rear rack, so I just use bungee cords to tie the carrier down.
There are bike pet carrier/baskets. I saw some on Amazon.com
You also can put you cat in a bike trailer(the one use for little kids or one specially made for pets). You just have to make sure your cat can't find it way out.