I’ve been road riding for a few months now – on a pretty large mens mountain bike (the bike is my boyfriends, he’s 6′5″. and I’m a 5′5″ female, 26yo). Even with the seat all the way down I barely fit – I cannot stand with my feet on the ground on either side of the bike. I’m to the point where my knees hurt before the rest of me is worn out – is this due to the bike fit? I want to ride additional at a time, but my knees won’t let me. It’s a continuous dull ache that starts pretty quickly, and lasts the rest of the evening after I stop riding. Both knees feel about the same, one doesn’t hurt more than the other. I’m plotting on buying a womens road bike soon, but I’m worried the knee pain won’t go away. Is the pain due to the too-huge bike and will likely go away once I’m on one that fits me properly?
Please only respond if you have actual knowledge of bikes and their fit, thank you 
sigh. Please only answer if you have actual knowledge or experience. thanks.
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get a smaller bike?
It’ll go away it has nothing to do with the size of the bike although i do recommend getting one your size. Your knees may just not be used to the motion and exercise they get on a bike.
I’m guessing the bike frame is too large for you. You must have a slight (5 degree) bend in your knee when the pedal is all the way down. If your legs are going completely straight, or you have to stretch for the pedals, then the seat is too high. If it won’t adjust down any more the frame is too huge for you.
im a mountain biker and when i sit on my bike for more than 5 minits my nees ace as well. but what i do is use a nee brace when i now ill bee sitting alot when im out riding. excellent luck and i hope that helps.
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The bike is way to large for you and will be hard on your knees. Stop ridding it before you really hurt yourself. Go to the local bike shop and get fitted for a bike. A genteel fitting bike will be excellent for your knees. You want to learn to pedal at a high cadence 70-90 rpm’s with a lite pressure on the pedals. Pedaling slow and mashing on the pedals is also hard on the knees.
http://sheldonbrown.com/beginners/index.html
Get a new smaller bike. Go to a signal bike shop and get fitted for a bike.
The size is doubtless straining your body and you have to stretch too much to reach the pedals. Also if the bike was fitted to your bf then you have to stretch too far to reach the front handlebars causing your body to be at the incorrect angle when you’re pedaling on top of the bars and on the drops.
When standing over the top tube with both feet flat on the ground you must have space between the top tobe and your crotch. I usually recommend two to three fiddle with widths. You must be able to lift up on the bike’s handlebars lacking the top tube hitting your straight away.
You’ll also need a shorter top tube so that you don’t have to stretch as much to reach the handlebars.
Another thing you need to look at is the gear you’re in when pedaling. It must be honestly simple pedaling. If you’re in a high gear and have to push hard to pedal then you’ll be straining your knees as well.
Last thing to check is your foot placement if you’re using clipless pedals. If the shoes aren’t lined up correctly then your knees won’t be lined up either so you’ll be straining them to push and pull on the pedals.
Don’t give up on the riding. It’s fantastic fun and fantastic exercise. You just need a bike that fits your body.
Check that the knees are not higher than the hip when you pedal (adjust the saddle if applicable)
Check that knees are over or in front of the pedal spindle when you pedal (adjust saddle position if applicable)
Check that the gear ratio does not offer significant Resistance to your pedaling (select more suitable gear ratios)
Check that you do not encounter early or pre-hyponatremia symptoms (hydrate with isotonic drink not just drinking water)