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Do I have a defective front shifter?
Hi all:
I'm struggling - once again - to fix the shifting on the front chainring of my daughter's 2004 Fuji Absolute and I'm wondering if a defective front shifter might be part of the problem. Here's the setup on the bike: 52-42-30 crank/Shimano Tiagra FD-443 front derailer/Shimano Rapid Fire SL-R440 8-speed shifters. And here's the problem: I lose the trim adjustment when shifting from the big ring down to the second ring. Shifting from small to large chainrings there's 3 distinctive "clicks" at the lever, with the 1st and 2nd clicks being very close together (i.e., very small movement of the lever) and the last click requiring a *huge* lever throw. So, the 1st click moves the chain from the small ring to the middle one. The 2nd click moves the front derailleur a small amount for trim adjustment. And the 3rd click moves the chain to the big ring. However, when shifting from large to small chaining there's only three "clicks" at the lever. The first click will (just barely) knock the chain from the big ring to the middle ring, with the derailleur resting at the "high side middle ring" trim level. The next click, which should move the derailleur to the "low side middle ring" trim position, instead knocks the chain down to the small ring with the derailleur resting against the low-side stop. No amount of finessing of the movement of the shift lever will produce that lower middle ring trim level. Does this sound like a defective front shifter, or some kind of mis- adjustment? TIA. Tom Young |
#2
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Do I have a defective front shifter?
TomYoung wrote:
Hi all: I'm struggling - once again - to fix the shifting on the front chainring of my daughter's 2004 Fuji Absolute and I'm wondering if a defective front shifter might be part of the problem. Here's the setup on the bike: 52-42-30 crank/Shimano Tiagra FD-443 front derailer/Shimano Rapid Fire SL-R440 8-speed shifters. And here's the problem: I lose the trim adjustment when shifting from the big ring down to the second ring. Shifting from small to large chainrings there's 3 distinctive "clicks" at the lever, with the 1st and 2nd clicks being very close together (i.e., very small movement of the lever) and the last click requiring a *huge* lever throw. So, the 1st click moves the chain from the small ring to the middle one. The 2nd click moves the front derailleur a small amount for trim adjustment. And the 3rd click moves the chain to the big ring. However, when shifting from large to small chaining there's only three "clicks" at the lever. The first click will (just barely) knock the chain from the big ring to the middle ring, with the derailleur resting at the "high side middle ring" trim level. The next click, which should move the derailleur to the "low side middle ring" trim position, instead knocks the chain down to the small ring with the derailleur resting against the low-side stop. No amount of finessing of the movement of the shift lever will produce that lower middle ring trim level. Does this sound like a defective front shifter, or some kind of mis- adjustment? TIA. Tom Young Shimano STIs don't have a trim-down technique for trim-equipped shifters... you have to shift down then trim up. I'm not sure about the flat bar shifters. -- Phil |
#3
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Do I have a defective front shifter?
TomYoung wrote:
Hi all: I'm struggling - once again - to fix the shifting on the front chainring of my daughter's 2004 Fuji Absolute and I'm wondering if a defective front shifter might be part of the problem. Here's the setup on the bike: 52-42-30 crank/Shimano Tiagra FD-443 front derailer/Shimano Rapid Fire SL-R440 8-speed shifters. And here's the problem: I lose the trim adjustment when shifting from the big ring down to the second ring. Shifting from small to large chainrings there's 3 distinctive "clicks" at the lever, with the 1st and 2nd clicks being very close together (i.e., very small movement of the lever) and the last click requiring a *huge* lever throw. So, the 1st click moves the chain from the small ring to the middle one. The 2nd click moves the front derailleur a small amount for trim adjustment. And the 3rd click moves the chain to the big ring. However, when shifting from large to small chaining there's only three "clicks" at the lever. The first click will (just barely) knock the chain from the big ring to the middle ring, with the derailleur resting at the "high side middle ring" trim level. The next click, which should move the derailleur to the "low side middle ring" trim position, instead knocks the chain down to the small ring with the derailleur resting against the low-side stop. No amount of finessing of the movement of the shift lever will produce that lower middle ring trim level. Does this sound like a defective front shifter, or some kind of mis- adjustment? That's the way it is supposed to work. It's a 'feature'! Any 2000 to 2006 Campagnolo left Ergo shifter, or a 2007 Chorus or Record Ergo, will not only give you a continuum of small steps both ways but riders with small hands generally prefer the shape and the smaller 'reach' on that middle-high shift. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 |
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