When I first started mountain biking, I rode in my "granny" gear all the time. If I tried riding in the middle ring I would blow up after just a mile or two. I would catch a lot of flack for this from everyone--the women and the men I rode with.

Finally, towards the end of the season, I decided to try the middle ring. And I could finally do it! And keeping up with everyone was suddenly very easy.

Just hang in there, do what is comfortable for you. It may not be a men vs. women thing but fitness level or even riding style.