shmoepong

I'm a long time lurker, first time poster that's exploring bike mechanics. I have a Bianchi Volpe that's getting chain rub on the front derailleur when shifting into larger gears. The Volpe comes with stock parts as seen on Bianchi's page (r/f Shimano Deore 9 spd, Shimano Tiagra 28.6mm). After the LBS told me they couldn't do anything to help, I tried adjusting the limit screws on the front derailleur myself. The front derailleur didn't shift to the right enough to curb the constant clicking. So I compensate by not using these high end gears. =(

Is chainrub common using the Deore/Tiagra combination? And is there anything I can do to fix the chainrub?

Here are the other specs to the bike if this helps:

Style: 27 speed cyclo-cross/touring
Brakes/Levers: Cane Creek SCX-5 cantilevers/ Shimano Tiagra STI
Crankset: Sugino XD500T, 28/38/48T
Bottom Bracket: Cartridge
Chain: SRAM
Cassette: SRAM, 11/32T 9 spd

Thanks in advance!

roadfix

Did you increase cable tension also as you backed out the limit screw? Simply backing out the outer limit screw won't change anything, in general.

shmoepong

I didn't increase the cable tension. That makes sense, I just assumed the screws controlled the tension. Thanks! =] If I increase the tension, is there anything to be aware of when I'm making adjustments?

svidrod

as roadfix said, increase your cable tension until it is just tight enough so it doesn't rub. hopefully at this tension you will still be able to shift to smaller gears. if it is a triple i wouldn't worry about it, who needs the granny gear anyway?

55-11

Oh Nooooooo!!!, there is nothng you can do. Here..., let me take that nasty, mean-ole-probably-crooked-and-bad frame off your hands. I won't even charge you to pick it up.

Honestly... there should not be a problem with the components, however, you seemingly have 2 issues.: the chain rub itself, and the FD not moving enough to cover your large ring.

Both may be addressed by the angle at which your hangers (both front and rear) are mounted. But b4 we go through all the things you CAN do, check out Parktool.com and Sheldonbrown.com. You have probably seen these sites listed on here b4 and most likely you've read the testimonials. Give them a shot and welcome to BF.

well biked

You need to use this link, start at the beginning, and as you work through the adjustment procedure you'll hopefully gain a good understanding of how the front derailleur adjustments work. It's not rocket science, but you can easily do more harm than good if you don't take the time to learn how it works. Good luck

https://www.parktool.com/repair/readhowto.asp?id=75

Portis

Yeah. It's not that hard but you need to start at the beginning and read carefully, not in the middle like you are here. Keep in mind that the limit screws are just like guard rails on a highway. They only control the outward (in the case of the guard rail analogy) and inward travel of the derailleur. In other words they are just "stops" that stop the derailleur from moving any farther IN or OUT.

With no cable attached the derailler will comfortably rest on the limit screw. When you attach a cable then you start having to talk about tension adjustment. Because with the cable attached, it may or may not be resting comfortably against the "stop" any more. This should sort of explain why tension is important.