Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-14-01, 01:52 PM   #1
LT1
Junior Member
Thread Starter
 
LT1's Avatar
 
Join Date: Jul 2001
Location: Toronto, Ontario
Bikes:
Posts: 14
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Missed gears...?

I ride a 93 DeRosa outfitted with a Dura Ace gruppo from that same year. This past spring I not only had one but two tuneups completed on the bike of which one was an overhaul. I still however while on the small ring up front miss or should I say skip gears while downshifting. I'll change gears, hear the click then all of a sudden bang my gears are doing a dance and then they settle into place.
Some folks on the forum through other threads have mentioned that wear and tear of either the chain or rear cogs can cause misshifting. How do you diagnose this? Also how can you tell when your cables are worn? Any help would be appreciated.
LT1 is offline   Reply With Quote
Old 08-14-01, 09:50 PM   #2
pat5319
Senior Member
 
pat5319's Avatar
 
Join Date: Sep 2000
Location: Spokane WA
Bikes: Seven Axiom Ti, Trek 620, Masi cylocross (steel). Masi Souleville 8spd, Fat Chance Mtn (steel), Scwinn Triple Bar cruiser, Mazi Speciale Fix/single, Scwinn Typhonn
Posts: 1,141
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Measure your chain, if it has more than 1,500 miles it's probably worn/stretched.
To measure chain- take a tape or rule measuring from center of one link pin to the center of another pin 12 inches away while putting tension on the chain, if the mark isn't center of pin to center of pin and is center of one pin to the edge of the other pin or worse the chain is worn anshould be replaced, to simplify the procedure use a "chain gauge" Park makes a very good one.
Cogs- Look at your cogs (edge on) if the teeth on the cogs you are using most are thicker than the ones you use less, then the thick cogs are probably worn, also if you look at the cogs from the side and some are getting a "shark fin" profile they're probably worn. It'a judgment call, the gauges for cog wear aren't as available or accurate/easy to use as the chain gauge.
If your cogs/rings are very worn a new chain will grind or skip. So either use the old stuff until everything quits shifting/working right and replace the drive train or replace the chain and the indiviual cogs now, some makers only allow replacement of the entire cassette, guees who- S*******.
Ride with little wear
Pat
pat5319 is offline   Reply With Quote
Old 08-21-01, 11:59 AM   #3
Xavier
Moderator
 
Join Date: Apr 2000
Bikes:
Posts: 531
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Whomever did the tune up really didn't do a good job as they should have checked this and ridden the bike.

Best to purchase a new chain and cassette. That simple. These parts wear out quite fast and replacing one instead of the two will cause this problem.
__________________
Xavier Cintron - www.bullteksports.com
Xavier is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 09:32 AM.