Have a slight problem with my Miyata 615s front derailleur
07-30-19, 07:31 PM
#1
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Have a slight problem with my Miyata 615s front derailleur
I have everything adjusted and it shifts very well. The only problem I seem to have
is when I shift from the small front chain ring back to the middle chain ring. To get
it to go to the middle ring you have go quite a ways past the normal position and then
trim it back from there.Is there an adjustment I'm missing? All the other shifts are fine.
is when I shift from the small front chain ring back to the middle chain ring. To get
it to go to the middle ring you have go quite a ways past the normal position and then
trim it back from there.Is there an adjustment I'm missing? All the other shifts are fine.
07-30-19, 07:46 PM
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I have everything adjusted and it shifts very well. The only problem I seem to have
is when I shift from the small front chain ring back to the middle chain ring. To get
it to go to the middle ring you have go quite a ways past the normal position and then
trim it back from there.Is there an adjustment I'm missing? All the other shifts are fine.
is when I shift from the small front chain ring back to the middle chain ring. To get
it to go to the middle ring you have go quite a ways past the normal position and then
trim it back from there.Is there an adjustment I'm missing? All the other shifts are fine.
07-30-19, 08:18 PM
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07-30-19, 10:14 PM
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It's too high. There should be about a penny thickness between the big chainring and the outer plate of the FD. Proper position will help to reduce sluggish shifting. I suspect that is your main issue. Since it's Biopace this is going to be a compromise. Just use the gap and the closest point.
The angle is also important. Make sure you get that right. The Park tools tutorials are pretty good. Making the inner plate parallel to the chainrings is a good start point, but what works best varies.
Beyond that, there are other ways to improve FD shifting, but they are kind of impossible to explain in words alone.
Also, clean and lube your chain. That will help.
The angle is also important. Make sure you get that right. The Park tools tutorials are pretty good. Making the inner plate parallel to the chainrings is a good start point, but what works best varies.
Beyond that, there are other ways to improve FD shifting, but they are kind of impossible to explain in words alone.
Also, clean and lube your chain. That will help.
07-30-19, 10:21 PM
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In a friction setup, it's quite normal to develop some cable stretch. Go to the granny ring, re-adjust limit screw and take all slack out of the cable with some pliers. Then adjust top limit screw and see what happens. If it's still not working, play with height position of derailleur on downtube and then angle.
Edit. All of what @Salamandrine just said
Edit. All of what @Salamandrine just said
07-31-19, 05:36 AM
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Great advice already. I will just say that as an old tourist i put small rings on my crank. Very often a 40 in the most out outbard position. Its difficult to find a road front mech that will get close enough. What you describe is what i run into a lot using a derailleur mounted too high.
07-31-19, 02:12 PM
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Your oval-ish Biopace chain rings force the front derailleur to be higher than needed for round chain rings to clear the high spots of the oval. Watch out for that.
07-31-19, 06:30 PM
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It's too high. There should be about a penny thickness between the big chainring and the outer plate of the FD. Proper position will help to reduce sluggish shifting. I suspect that is your main issue. Since it's Biopace this is going to be a compromise. Just use the gap and the closest point.
The angle is also important. Make sure you get that right. The Park tools tutorials are pretty good. Making the inner plate parallel to the chainrings is a good start point, but what works best varies.
Beyond that, there are other ways to improve FD shifting, but they are kind of impossible to explain in words alone.
Also, clean and lube your chain. That will help.
The angle is also important. Make sure you get that right. The Park tools tutorials are pretty good. Making the inner plate parallel to the chainrings is a good start point, but what works best varies.
Beyond that, there are other ways to improve FD shifting, but they are kind of impossible to explain in words alone.
Also, clean and lube your chain. That will help.
