Originally Posted by Viceroy
Sorry to repeat questions which are no doubt hidden in the archives.
I find myself constantly sliding forward on my bike saddle. So is this a saddle fit problem, a saddle choice problem, or a bike fit problem?
very similar question asked there recently and answered by Steve Hogg.
I am assuming your saddle is completely level (nose to tail, using a carpenter's level device, bike on a level ground). I think your reach could be too long i.e. distance and drop from saddle to handle bars too long - due to stem or top tube or both being too long. It could also be that your are sitting too far back and naturally need to slide forward under load. Or a bit of both.