Maybe the stem as rusky says. You may feel comfortable enough but may find you are having to stretch forwards which could be causing you to slip.
Maybe try a shorter stem. It shouldn't cost much. Don't know if the diameter is right but THESE seem pretty cheap.
Worked for me. Kept moving saddle forward but no better then tried moving it back half an inch and bingo.Now where did I read that falling off the front of the saddle can be a symptom of having the saddle too far forward?
Worked for me. Kept moving saddle forward but no better then tried moving it back half an inch and bingo.
Seems strange but true.
I used to slide forward a bit on the saddle, until i was reluctantly forced to move it about 1cm further forwards and a touch higher to fit on my saddlebag. Turned out that despite me thinking it was set up properly (according to guides on the interwebs) the new position kept me in the saddle, still allowed full extension of my leg and very slightly less knee bend at 3'o'clock position which coincided with my occasional knee pain disappearing completely.
It seems setting up a bike fit is a fine art, or to me anyway![]()
I read an old 1940s book on cycle touring over Christmas and it suggested having the nose of the saddle 2" behind the centre of the bottom bracket spindle. I have tried this and I definitely feel more comfortable on the bike. I would suggest this as a starting point for saddle fore/aft position.
I wouldn't move the saddle to adjust the reach to bars. If the reach to the bars is a problem, you NEED a different stem. The fore/aft position on the saddle is more than just the reach to the bars.
I wouldn't necessarily say the bike is too big either. It might be by modern standards but the fashion for small and large frames has come and gone over the years. I'm 5'11 and have a 25" frame I can ride in perfect comfort, it's just slightly borderline for standover height but it was the fashion in 1975 when the frame was made.
Edit: Have a read of this - http://www.peterwhitecycles.com/fitting.htm