Bicycle TutorBicycle Tutor

Show off your bike!

Related video tutorials:
How to Adjust Your Front Derailleur How to Adjust Your Front Derailleur
* Now with 3D interactive instructions
Problems with rear detrailleur
#1
Hi,

I have replaced the gear cable on my bike and have tuned it up so the gears are changing correctly, however it won't go into the lowest gear because the upper cog on the derailleur is touching the cog for the lowest gear. I understand from the various articles I've looked at that most derailleurs have a tension adjustment screw but the Shimano gears on my bike appear not to have one. I've stuck a couple of photos below to further illustrate the problem. Any suggestions as to how I might get around this would be most appreciated.

[attachment=1121]
[attachment=1122]
Reply
#2
One thing you need to do is clean that drive train its dirty. It may be there but its so dirty you may not see it.
My dad always told me a Sledge a matic can fix any thing.
Reply
#3
Can you take a photo from the side and back, the normal way up (not top or bottom)?
(There is usually a "B" tension screw to set the dérailleur angle but maybe not in this case.)

Did the gears work perfectly before?

Did you adjust anything else?
Has the chain been removed / altered lately?
If you didn't, and the gears worked before, then I can only think the adjustment is out of line.
[font=Trebuchet MS]Ride hard or ride home alone![/font]
Reply
#4
Something else I would like to add is the wire coming from the last anchor bolt should be moved away from the derailler arm (RED ARROW) and trimmed up (BLUE LINE). If you noticed in the YELLOW CIRCLE the peg has been bent out of shape. Not sure if this will have any effect on performance but might in the shifting. Surely is correct you need to clean up the drive train (Chain, Rear Derailler, Front Derailler, and in between gears) too as this has weird effect on shifting and performance. Hope you do not mind me using your picture to show ya.
One other thing I forgot to mention is to check your chain for wear like Alex's Video tut .... http://bicycletutor.com/chain-wear/ .
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Reply
#5
Shimano 7 speed mega range, not a good system and didn't stay in production for long, try searching Shimano's site for info.
Reply
#6
matr,

could you give me a picture of where the red arrow is pointing? Reason is I may think I know another problem making it not shift correctly.
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Reply
#7
I have a similar budget Shimano mech on one of my bikes. There isn't a B tension adjuster on it and I have the exact same problem. I can only assume that the the largest rear sprocket is too large for the mech to actually cope with.
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Rear Shifting Problems! cricket0140 5 2,998 10-19-2014, 01:08 PM
Last Post: painkiller
  Grip shift and rear derailleur problems mtnbikr 2 5,352 09-30-2013, 09:36 PM
Last Post: mtnbikr
  Rear shifting problems Mike_D 1 5,891 05-17-2011, 11:28 AM
Last Post: cyclerUK
  Rear derailleur having problems ballininthamix 2 5,134 03-01-2011, 11:17 PM
Last Post: ballininthamix
  Rear derailler problems catswain 3 6,949 11-22-2010, 01:55 AM
Last Post: bikesterTodd
  Some problems with rear derailleur and rear wheel pippobaudo 1 6,880 08-03-2010, 04:31 PM
Last Post: xerxes
  Rear Derailleur Re-Installation Problems stevedos 2 6,523 04-20-2009, 02:52 AM
Last Post: stevedos

Forum Jump:



ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy / Created by Alex Ramon

feed