Quote Originally Posted by OakLeaf View Post
Another thing that can cause you to slide forward on your saddle is having a "pear-shaped" saddle (gradual transition from butt to nose) when you need a more "T-shaped" one (sharp transition). That was my experience anyhow - as I pedaled, my thighs would pull my butt forward to the narrower part of the saddle, because when my legs are extended, I don't have that much space between my thighs.

Ditto this, I had the same problem. And even though I've got a bigger lower body than upper body, until I started biking, I had no idea that my pelvis is actually quite narrow and my sit bones are close together. I need a narrow saddle which is totally counter-intuitive based on my shape. You just never know until you take some measurements!

In addition to the advice given here, there is one more potential issue to think about. If you are finding yourself sitting on the front of your saddle more than back on your sit bones, it may be that your reach to the bars is too long and you instinctively scoot forward to compensate. Soooo many different things come into play when it comes to comfort on a road bike...if one tweak doesn't work, don't give up. You should not have to live with pain (at least, not that kind of pain!).