dexmax

I took out the rollers of my rear derailer because I wanted to dismount it from my bike, without breaking the chain..

I noticed that there were no signs of lubrication being applied inside.. Or, has the original lube dried up?

If it does need lubrication, what kind of lubricants should I use? grease?

Thanks..

MichaelW

Clean all the grit out and apply some grease.
Make sure you replace the top and bottom rollers in the right place.

RainmanP

As MichaelW suggests, the pulleys are position-specific. Assuming your der is Shimano, one pulley will be marked with a G. This is the Guide pulley and goes closest to the hanger.

Resident

Make sure the bolts are secure when you re-install the pulleys! I've seen too many rear ders explode from tightening them improperly.

moabrider47

I usually clean them thoroughly and throw some Finsh Line X-country lube on the roller inside the pulley. I found that grease just gunks up faster - and we're not talking about bearings. The lube seems to do fine.

-Moab

fubar5

T-9 Boeshield should do the trick.

Avalanche325

Use Lok-tite on the bolts when you put them back in. That will keep them from falling off somewhere down the road.

Phatman

hey! that happend to me! It spurred a whole set of ideas where I thought of going singlespeed,but that didn't work too well, considering my stubborn determiniation and lack of mechanical skills. Total broken parts: @$#!ed up rear mech, stripped freewheel remover, bent rear axle, and a wheelset that will probably never be used again.