Quote:
Originally Posted by Nocturnal310 /img/forum/go_quote.gif
my stupid bikes gears are not shifting properly.
any tips?
|
clean & oil anything gear related.
it's mostly about cable tension. shift to the gears slackest position & undo the cable bolt (on the derailleurs). on the rear mech there is a barrel adjuster*; turn the plastic adjuster clockwise so that the inner (metal adjuster) disappears. this is to slacken the adjustment. you might wanna turn it back a few turns in case you overtighten the cable:
now pull the cable hand tight (i use mole grip pliers but not too tight!) in the mech & clamp it with the bolt. it's best to use a stand for this; you can turn the pedals while adjusting the gears. if the derailleur struggles to get the chain up the next cog, it may be too slack, so turn the barrel adjuster anti-clockwise 1 or 2 turns (the more you tighten it, the more inner (metal) barrel adjuster will show). if it shoots up two cogs at once the cables probably too tight, so slacken it 1 or 2 turns clockwise.
if after all this you get most of the cogs but chain struggles to reach the biggest or smallest cog, or overshoots them, you can adjust the two limit screws on the mech, you only need to touch these if the chain jumps off the last sprockets, or cannot reach them despite all your adjustment.
there is a third screw under the mech which pushes against the frame drop-out. this is to keep the derailleur cogs from hitting the sprockets, shouldn't normally need to touch this either.
*there are barrel adjusters on the shifters too. while you have the cable undone, you could slacken these (so that no metal inner barrel is showing) & then turn them back 2 or 3 turns in case you need to use these.
lastly, be careful not to pull the cable too tight when fitting, especially the front mech, if cable tension is too much at the front it may snap. the ramps & pins on the cogs will do their job lifting the chain up to the biggest!