Ali89

Hi,

I recently reduced my stem length by 2cm to as I felt my weight too far forward and I already am a little behind kops. Unfortunately this leads to knee discomfort but I don't understand how. I see the 2cm is a relatively large change, should I just go easy for a while or switch the stems back and look at set back again?

Thanks

snow_echo_NY

I don't know but sympathies.
had a similar issue but it was the opposite.

i had knee pain from cycling daily for a commute about 9 miles round trip.

apparently my seat was too high. i mistakenly thought my knee pain meant that my seat had to go higher to alleviate the dull pain - but i went to my local shop and they observed me cycling in the shop, and they said my seat was too high and they lowered it. it felt instantly better and i haven't had an issue commuting since then.

2 cm is huge! when you say stem, do you mean your seat post? cuz if you're too far forward, i would raise your handlebars or lower your seat post or both. more details would help like your bike type. maybe even include a photo. but if it's the correct call it should start feeling better i think, i'm not sure if there's a period of adjustment you seem to be suggesting but i'll let others more experienced chime in. my guess is you made the wrong adjustment.

Carbonfiberboy 

Ignore KOPS. It's a good starting point toward getting your weight balanced but you have to go from there. If there's too much weight on your hands, move the saddle back. For me, I have less weight on my hands with more reach. Reach increases the lever arm. Since your hips are the pivot point, you may need to exert a small torque to keep from falling forward. Torque = force * distance. Increase distance, decrease force, same torque.

https://www.youtube.com/watch?v=z04uoO7U_SA

I don't see how moving your bars back could affect the motion of your knees.