knees

[captainhastings]

I have an old marin bike with a 19 inch frame but it seems to hurt my knees when I ride it.
I am 5,8 so thought the frame would be ok. I have the seat height set so my leg is nearly at full stretch when the peddle is at the bottom but for some reason when I am on it I feel like I am sat very low down.
I have another bike which is actually an extra large frame and I have no issues with it and it is comfy as hell.
Yet when you google frame sizes in theory that should be too big for me.
I seem to like being high up and at full stretch

 

[cyberknight]

Is your saddle set back over the BB the same as well as crank length?
I would measure height from pedal to saddle and how far back the saddle is from the centre of the BB as setback can alter effective saddle height as well

 

[Gravity Aided]

1- Where does the knee pain occur?
2-What sort of riding do you do on the Marin, and on the other bike?(e.g. Mountain, Trail, Road)
3- Are the measurements the same? Sizes vary among manufacturers.

 

[Dangermouse]

How high up are the bars, if its a 19" frame it looks like the front end is too high up for you, I am 5'10 and only use a 17" MTB frame or 53cm road frame

 

[Dangermouse]

ALSO are you using spd's and different shoes?

 

[captainhastings]

This is the bike

I use it for comutting 8 miles each way
I rode it for a week got bads knees at the front just below the cap so swapped to this bike and perfect

back to the marin for one day and knees killing me despite raising the seat. Looking at the picture the seat does seem way back so maybe I will try moved it forward.
I don't use spd's and thanks for the suggestions. If I can't sort it then it will have to go

 

[Gravity Aided]

Look at "Patellar Compression Syndrome" and Illotibial Band Syndrome"
Here:
http://www.bikeradar.com/fitness/article/health-knee-care-and-maintenance-part-2-17445/
Not saying that is what you have, but it may be a place to start, as well as stretching exercises. I want to tell you that after college biology I have little or no further knowledge of medicine. But this may help, or give you some idea. The article's recommended exercises and stretches may help, although I have no idea why the first fellow is stretching while contemplating batteries.

 

[Gravity Aided]

Also check your distance from saddle nose to bars, as well as comparative saddle height, and also the length of your cranks, probably engraved on the back side of the cranks, in mm. Bar height may also be a consideration.

 

[jowwy]

to me it looks like the saddle is set too far back on the marin compared to the butler.

 

[Cycleops]

I like a frame that is a little too big for me. Your leg should be straight with the crank a six o clock. But there is a school that says the measurement should 109% of inseam following research some years ago, but that is for maximum power delivery.

 

[cyberknight]

I like a frame that is a little too big for me. Your leg should be straight with the crank a six o clock. But there is a school that says the measurement should 109% of inseam following research some years ago, but that is for maximum power delivery.

I like the leg on pedal methos which gives me a saddle height maybe 8 mm higher than 109%, interestingly enough the the inseam x.889 method for saddle height from BB gives a very similar measurement to the heel on pedal for me.