Front Derailleur Height
#1
No one carries the DogBoy
Thread Starter
Front Derailleur Height
I recently changed from 30-42-52 chainrings to a 28-38-48 chainrings. I swapped out the cranks and adjusted the Derailleur just fine, but I didn't drop the derailleur down, since I would have to re-align and re-clamp the seatpost clamp. What kind of problems can arise from having the derailleur be higher than the 1-2 mm height suggested? In working through the gears there doesn't seem to be any problem shifting. At this point, would you drop it down or leave it be?
#2
Senior Member
Join Date: Jan 2004
Posts: 9,428
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Originally Posted by DogBoy
I recently changed from 30-42-52 chainrings to a 28-38-48 chainrings. I swapped out the cranks and adjusted the Derailleur just fine, but I didn't drop the derailleur down, since I would have to re-align and re-clamp the seatpost clamp. What kind of problems can arise from having the derailleur be higher than the 1-2 mm height suggested? In working through the gears there doesn't seem to be any problem shifting. At this point, would you drop it down or leave it be?
#3
Licensed Bike Geek
Originally Posted by DogBoy
I recently changed from 30-42-52 chainrings to a 28-38-48 chainrings. I swapped out the cranks and adjusted the Derailleur just fine, but I didn't drop the derailleur down, since I would have to re-align and re-clamp the seatpost clamp. What kind of problems can arise from having the derailleur be higher than the 1-2 mm height suggested? In working through the gears there doesn't seem to be any problem shifting. At this point, would you drop it down or leave it be?
It's a simple job and should be done.
#4
No one carries the DogBoy
Thread Starter
Planned to do it from the start, but when it worked fine after the crank swap thought I might only have to adjust the wire tension. That seemed to work fine, hence the question. I guess I'll adjust it tonight. Thanks.
#5
Senior Member
Join Date: Jul 2004
Location: Cental New Jersey
Posts: 469
Bikes: Klein Quantum Pro
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Use a torque wrench. Check the ParkTool web site for torque specs so you don't crush anything. Use a penny or a dime as a spacer to get the height correct.
#6
Senior Member
Join Date: Jan 2004
Posts: 9,428
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Originally Posted by NJWheelBuilder
Use a torque wrench. Check the ParkTool web site for torque specs so you don't crush anything.
#7
Senior Member
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1572 Post(s)
Liked 643 Times
in
364 Posts
Originally Posted by DogBoy
Planned to do it from the start, but when it worked fine after the crank swap thought I might only have to adjust the wire tension. That seemed to work fine, hence the question. I guess I'll adjust it tonight. Thanks.
#8
No one carries the DogBoy
Thread Starter
How about I assume the current clamp is at the appropriate tension, and count the number of revolutions needed to "free" the clamp for movement, then tighten with the same number of revolutions. Or I can just tighten to "snug."
#9
Senior Member
Join Date: Jan 2004
Posts: 9,428
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Originally Posted by DogBoy
How about I assume the current clamp is at the appropriate tension, and count the number of revolutions needed to "free" the clamp for movement, then tighten with the same number of revolutions. Or I can just tighten to "snug."
#10
Senior Member
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1572 Post(s)
Liked 643 Times
in
364 Posts
Originally Posted by DogBoy
How about I assume the current clamp is at the appropriate tension, and count the number of revolutions needed to "free" the clamp for movement, then tighten with the same number of revolutions. Or I can just tighten to "snug."
#11
Senior Member
Join Date: Jul 2004
Location: Cental New Jersey
Posts: 469
Bikes: Klein Quantum Pro
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
People do it all the time. You can do whatever you want without one. Its your bike. I always use a torque wrench.
#12
Senior Member
Join Date: Jul 2004
Location: Cental New Jersey
Posts: 469
Bikes: Klein Quantum Pro
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Do it the right way. Use a torque wrench. That whole "feel" thing is nonsense. One persons "feel" is different from another persons "feel."
#13
Senior Member
Join Date: Jan 2004
Posts: 9,428
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Originally Posted by NJWheelBuilder
Do it the right way. Use a torque wrench. That whole "feel" thing is nonsense. One persons "feel" is different from another persons "feel."
#14
NFL Owner
Originally Posted by sydney
You are the one blowing the nonsense.
What one person feels is tight, another would consider loose, and a third would not be able to budge. Everyone has different hand strength. Everyone has different levels of control on how tightly they turn a wrench.
I don't use a torque wrench. I wrench by feel. Every bike I have ever worked on, I did so as if I were going to be the one riding it. If I ever have an issue with a part that I installed coming loose because of improper tightness, I'll invest in a torque wrench.
#15
Senior Member
Join Date: Jan 2004
Posts: 9,428
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Originally Posted by monogodo
Wrong.
What one person feels is tight, another would consider loose, and a third would not be able to budge. Everyone has different hand strength. Everyone has different levels of control on how tightly they turn a wrench.
I don't use a torque wrench. I wrench by feel. Every bike I have ever worked on, I did so as if I were going to be the one riding it. If I ever have an issue with a part that I installed coming loose because of improper tightness, I'll invest in a torque wrench.
What one person feels is tight, another would consider loose, and a third would not be able to budge. Everyone has different hand strength. Everyone has different levels of control on how tightly they turn a wrench.
I don't use a torque wrench. I wrench by feel. Every bike I have ever worked on, I did so as if I were going to be the one riding it. If I ever have an issue with a part that I installed coming loose because of improper tightness, I'll invest in a torque wrench.
#16
Senior Member
Join Date: Jul 2004
Location: Cental New Jersey
Posts: 469
Bikes: Klein Quantum Pro
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
So you are saying that you can adjust a bolt to the manufacturers recommended torque just by "feel?" You are saying that actually measuring the torque is not as good as guessing? That's truly amazing.
#17
Senior Member
Join Date: Jan 2004
Posts: 9,428
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Originally Posted by NJWheelBuilder
So you are saying that you can adjust a bolt to the manufacturers recommended torque just by "feel?" You are saying that actually measuring the torque is not as good as guessing? That's truly amazing.
#18
The Red Lantern
Join Date: Apr 2003
Location: Raleigh NC
Posts: 5,965
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
If you do it enough you do get the calibrated elbow. I use a torque wrench for a lot of things, like the new two piece cranks and stem clamps but not the pinch bolt on the der clamp. However a newb or a person that does not know their own strength might be better off using one to make sure. This also assumes the wrench is calibrated correctly.
__________________
Are you a registered member? Why not? click here to register. Its free, and only takes 27 seconds!
Help out the forums, abide by our community guidelines.
I am in the woods and I have gone crazy.
Are you a registered member? Why not? click here to register. Its free, and only takes 27 seconds!
Help out the forums, abide by our community guidelines.
I am in the woods and I have gone crazy.