Chain keeps rubbing on inside derailleur despite adjustments
#1
Newbie
Thread Starter
Join Date: Aug 2020
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Chain keeps rubbing on inside derailleur despite adjustments
I have a Specailized Allez Elite road bike with a triple on the front and nine on the back (it's about 10 years old and has been a great bike), but lately the chain keeps rubbing on the inside derailleur. I have had a tune up at the local bike shop and when I get it back the chain is right in the middle of the derailleur and not rubbing. Within a few miles of riding it is rubbing on the inside again. I have used the trim to try and adjust. I took it back to the bike shop and they adjusted the chain back into the middle and when on their rack it performs well and appears adjusted. Again, within a few miles of riding the chain is back rubbing on the inside of the derailleur. They adjusted it again and the problem persisted. I am not sure why the chain keeps moving to the inside but it is annoying to ride with the rubbing noise announcing my arrival to other bikes or walkers on the bike path I use. I typically ride on the middle ring up front for about 90 percent of my riding and use gears 5-9 on the back for about 90 percent.
Any ideas? Getting frustrated.
Any ideas? Getting frustrated.
#4
Klaatu..Verata..Necktie?
Join Date: May 2007
Location: SF Bay Area
Posts: 17,962
Bikes: Litespeed Ultimate, Ultegra; Canyon Endurace, 105; Battaglin MAX, Chorus; Bianchi 928 Veloce; Ritchey Road Logic, Dura Ace; Cannondale R500 RX100; Schwinn Circuit, Sante; Lotus Supreme, Dura Ace
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 10425 Post(s)
Liked 11,899 Times
in
6,094 Posts
I don't think the chain is moving, it's the derailleur.
__________________
"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles
"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles
#5
Senior Member
Join Date: Jul 2020
Location: Parts Unknown
Posts: 356
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 325 Post(s)
Likes: 0
Liked 109 Times
in
72 Posts
I have a Specailized Allez Elite road bike with a triple on the front and nine on the back (it's about 10 years old and has been a great bike), but lately the chain keeps rubbing on the inside derailleur. I have had a tune up at the local bike shop and when I get it back the chain is right in the middle of the derailleur and not rubbing. Within a few miles of riding it is rubbing on the inside again. I have used the trim to try and adjust. I took it back to the bike shop and they adjusted the chain back into the middle and when on their rack it performs well and appears adjusted. Again, within a few miles of riding the chain is back rubbing on the inside of the derailleur. They adjusted it again and the problem persisted. I am not sure why the chain keeps moving to the inside but it is annoying to ride with the rubbing noise announcing my arrival to other bikes or walkers on the bike path I use. I typically ride on the middle ring up front for about 90 percent of my riding and use gears 5-9 on the back for about 90 percent.
Any ideas? Getting frustrated.
Any ideas? Getting frustrated.
If it's not the pulley wheels, then there could be precession in your rear axle/freehub/cassette. To diagnose, make sure the back wheel is properly installed, put the bike on a bike stand, and crank the pedals to get the back wheel spinning very fast in the normal travel direction. Look closely to see if the cassette is sort of rocking up and down relative to the frame. That movement is a sign that your rear hub needs to be overhauled: repack the bearings and consider replacing the freehub.
You might also check the derailleur hanger to make sure it isn't bent. After checking the rear hub, double-check the cable tension and indexing.
#7
Senior Member
Join Date: Jan 2010
Location: TC, MN
Posts: 39,520
Bikes: R3 Disc, Haanjo
Mentioned: 354 Post(s)
Tagged: 1 Thread(s)
Quoted: 20810 Post(s)
Liked 9,456 Times
in
4,672 Posts
Not the cable - he said the "cable casing." He's taking about the housing effectively getting shorter as the end falls apart, making the cable less taut.
Likes For WhyFi:
#11
Junior Member
Slipping or Stripped threads on the adjusting screws (maybe use some thread-locker), loose front derailleur clamp, general wear on the derailleur pivot points...that's all I got...
10 years old, but how many miles?
10 years old, but how many miles?
Last edited by AndrewJB; 08-11-20 at 09:51 AM.
#12
Junior Member
Slipping rear axle quick release under load causing the cassette to go crooked.