Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

shifting issues

Reply

Old 06-20-10, 10:42 PM
  #1  
lemak
Senior Member
Thread Starter
 
lemak's Avatar
 
Join Date: Feb 2009
Location: Harrisburg, PA
Posts: 102

Bikes: 2009 CAAD 9, 2009 F7

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
shifting issues

my girl friends bike is equipped with tourney shifters and a no name sram front derailleur. it is a cannondale quick 6. it also has a shimano triple crankset also.

this issue happens when the bike is under load... i have tried to explain to her that she cant expect this thing to shift quickly and precisely.

so what can i do to this bike to make the above better? i want her to be able to shift the front chain ring under load. does this sound like i can solve this by getting an upgraded shifter?

where should i begin?
lemak is offline  
Reply With Quote
Old 06-21-10, 02:45 AM
  #2  
dabac
Senior Member
 
Join Date: Mar 2008
Posts: 7,930
Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 805 Post(s)
You've got two unquantifiables here, "under load" and "smooth". Depending on what your/hers personal opinion about these are, you might never get a satisfying result. The things you can do:
1) take a look at the chainrings, ones that are "ramped" and "pinned" are supposed to offer better shifting.
2) check your cabling and try to get a feel for the derailer spring. A really clean routing of the cable will lead to less flex/compression of cable routing, which should help with snappier upshifts. A strong derailer return spring should help with downshifts.
3) some chains are supposed to shift better than others. Shop around a little.

But above all, try some schooling. A lot of her problems would go away if she rode with a bit of advance planning. A bike with a triple front usually have plenty of repeat gear ratios, so the trick when approaching a climb is to do a double shift. Drop the front one ring and drop the rear 1-2 gears. That'll leave your cadence just about unaffected, and you'll be on the right ring when you hit the incline.

The least part of the equation is probably the shifter, unless she's having trouble pushing/turning on it hard enough. When you do a front upshift you're basically pulling directly on the cable and with that the derailer. If her thumb is too weak then maybe a grip shift or a downtube shifter mounted on a Thumbie can help. Front downshifts happens courtesy of the derailer return spring, so not mufh influence of the shifter there.

Last edited by dabac; 06-21-10 at 02:49 AM.
dabac is offline  
Reply With Quote
Old 06-21-10, 07:09 AM
  #3  
lemak
Senior Member
Thread Starter
 
lemak's Avatar
 
Join Date: Feb 2009
Location: Harrisburg, PA
Posts: 102

Bikes: 2009 CAAD 9, 2009 F7

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
well i have tried to explain this to her until i am blue in the face!!! she consistently tries to shift when going up hills. there is nothing i can do to stop her from doing this.... so to save myself some frustration i just dont say anything and i will do what i can to possibly upgrade the drive train.

so from what you have wrote i will possibly try a new chain and see if it improves.
lemak is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service