Joined: Jul 2002
Posts: 40,863
Likes: 3,115
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
Check to see that your saddle is level. I see many new riders with their saddles angled down, particularly male riders. This leads to sliding down and forward and you have to push back to counteract it.