mtbN00b Posted December 17, 2009 Share I have put up some new brakes and gear shifters. Not sure the model of the shifters but the look like oldish alivio gears. (if i am correct) I had these things on https://www.bikehub.co.za/forum_posts.asp?TID=70702&PID=1025154#1025154 I then upgraded to juicy 5 which resulted in that i needed new shifters so i got shimano shifters from someone. But they do not have the model on and is it only temporarily for a month or 3. But my question now is how do you exactly adjust the gears so that the chain does not touch the front derailer when changing the rear gears. The rear gears looks almost fine - but sometimes it looks as if the chain runs over n bump before it chance to the other gear when i change it. (do not exactly know how to describe it). Please keep in mind that this is the first time that i am doing this .... any tips will do. mtbN00b2009-12-17 07:12:15 Link to comment Share on other sites More sharing options...
mtbN00b Posted December 17, 2009 Share anyone at all? Link to comment Share on other sites More sharing options...
Piernas Flacas Posted December 17, 2009 Share If your chain is rubbing your FD you'll either have to adjust the limiting screws on top of the FD (the ones with + and -) or you can make small adjustments with the one situated on the shifter lever (where the cable joins). I hope this helps. Link to comment Share on other sites More sharing options...
mtbN00b Posted December 17, 2009 Share ok i tried the screw but can you maybe explain more exactly how they work? and when you insert the cable into the derailleur - on which gears must it be aligned? Link to comment Share on other sites More sharing options...
dirtrider Posted December 17, 2009 Share If it looks like the chain goes over a bump on the back then it normally indicated a stiff link on your chain . As for FD , the limit screws are only there to stop the chain from either falling outwards of the big blade or inwards of the granny blade . If neither of these happens then do not adjust these screws to make the rubbng go away . For that use the adjustment at the top when your change lever is . What I do is to turn the adjustment screw at the top in completely and then remove the cable from the FD while it is on the smallest blade . Then put a screw driver between the blade and the FD so that it ooks like the gap on both sides are the same (i.e try screwdrivers with a different od) . Pull the cable tight with pliers and while holding it tight tighten the screw that hold the cable . It sound tricky but is very possible with just two hands . In most cases yur shifting will be perfect and there will be no running . If it does nit shift smoothly turn out the top adjuster till required results are obtained . This is not the method described in all the "how to " books but it works for me and JB will most probably have a heart attack if he sees this . Link to comment Share on other sites More sharing options...
Captain Fastbastard Mayhem Posted December 17, 2009 Share Sounds as if the cable needs a teeny bit more tension in it. There should be a ferrule (screwy thing) at the back of the rear derailleur. Turn it in an anti-clockwise position (as if you were unscrewing it) about 1/4 a turn or so. Then test it again, and adjust accordingly. It'll be a bit of trial and error, but each time you change the position of the screwy thing you'll need to change gears a couple of times to re-set the position of the derailleur (it moves slightly out of position when you turn the screwy thing) As for the chain rubbing on the Front derailleur, we need to ask a few questions before we go there... Are you running the bike on the smallest cog at the back while you're in the smallest cog at the front? Are you doing the opposite (ie: big cog at the back, big cog at front)? If you are doing one of those two, then stop riding in those combinations. It places undue stress on the chain, and you can almost exactly replicate the ratio by changing to a different combination. If you answered no to the above questions - you'll need to adjust the derailleur "stops" by using a screwdriver to screw/unscrew the screw (marked H if it's rubbing while in the big ring, or L if it's rubbing while you're in the small ring. If it's rubbing while you're in the middle ring, you need to play with the cable tension as described in the next paragraph) on top of the front derailleur. Once again, this is a case of trial and error, so it may be a while before it's adjusted properly. You should see the derailleur moving to the left / right in response to your adjustments on the screw. Stop when you think it's in the right position, change gears and review the position of the derailleur. Repeat or re-adjust if necessary until it's in the right position. Once you've done this, and if the chain is still rubbing (and the chain is touching the derailleur on it's Right hand side) you might have to do the same thing you did to the rear derailleur. There should be a small screwy thing on the left hand shifter, which you'll also need to adjust to get the correct amount of tension. Either way, just play with those settings until you've found a happy medium. Hope this helps!!! And welcome to the beginning of servicing your own bike!!! Link to comment Share on other sites More sharing options...
Piernas Flacas Posted December 17, 2009 Share Ok, the way I do it I set the limiter screws first before putting the cable. I can't rememer which one is which (+ or -) but what they do is limit the movement of the derailleurs so the chain doesn't go beyond the intended travel. Use a screwdriver to see how far the derailleurs are moving. The first and last gears at the back should be perfectly aligned with the derailleur pulley. The derailleur must not go past it and this is adjusted with the screws. At the front it is similar but since there is no pulley try to align your bigger and smaller chainring to the middle of the FD cage. Again, use the screws to get this right. Then you can put the cables. Before tightening the bolt that keeps the cable in place make sure that there's no cable slack but don't pull to tight or the derailleur will move from it's starting position. After that is a matter of adjusting with the barrels (the one in the RD for the back and the one in the lever for the front). I hope this helps. Link to comment Share on other sites More sharing options...
Andrew T Posted December 17, 2009 Share I've found that when I have the chain rubbing against the deralleur guide I need to make bigger adjustments by changing lengthening/shortening the cable at the deralleur. The adjustment is made where the deralleur grips the cable and is usually adjusted with an allen bolt. I usually align against the biggest chain ring Link to comment Share on other sites More sharing options...
mtbN00b Posted December 17, 2009 Share cool will try it tonight and see if i get it running perfectly ... cptmayhem both of your questions my answer is negative . Link to comment Share on other sites More sharing options...
100Tours Posted December 17, 2009 Share Do what cptmahem said - that's the best method for setting the chain at the rear. Next, have a very careful look at the orientation of the front derailleur - if it is not 100% parallel to the chainrings you can have rubbing problems as you describe. Experiment with moving it between the 5-to-12, 5-past-12 'o clock positions on the seat tube and see if this helps. Link to comment Share on other sites More sharing options...
mtbN00b Posted December 17, 2009 Share a stiff link - does it mean my chain needs a wash? Link to comment Share on other sites More sharing options...
Captain Fastbastard Mayhem Posted December 18, 2009 Share No, it means you gave it too much Viagra last night. Yes, basically. Might need cleaning, but it could be as bad as a corroded link in which case you'll have to either: Put in a new link or Buy a new chain. Just clean it well with Cleen Green, or some other degreasing agent, then apply some 5 in 1 oil to the chain to get it lubed up again. Link to comment Share on other sites More sharing options...
MaxUmis Posted December 18, 2009 Share http://bicycletutor.com nuff said. MaxUmis2009-12-18 03:49:47 Link to comment Share on other sites More sharing options...
mtbN00b Posted December 18, 2009 Share http://bicycletutor.com nuff said. freakin awesome dude Link to comment Share on other sites More sharing options...
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