The problem is that I am unable to adjust the low limit setting to avoid excessive rubbing of the chain against the cage inner plate.
With the low limit is set for a minimum clearance (less than 1mm) between the cage inner plate and the chain (with chain on the largest rear cog and small front chainring) I get no rubbing on all but 3 smallest cogs (still while on smaller front chainring); I can understand if the rubbing happened only on the extreme gear combo: smaller chainring and the smallest cog BUT all 3 smallest cogs?
In order to eliminate the rubbing on the 3rd smallest (rubbing only on 2 smallest) cog I must entirely eliminate the clearance between the cage inner plate and the chain (with chain still on the largest rear cog and small front chainring) and therefore introduce the rubbing on the smallest gear (largest rear cog and smaller chainring).
Moving the front derailleur higher on the seat tube or setting it slightly at an angle with respect to the chainrings does not produce better results.
It seems that the cage is slightly too narrow for its chain rub-free operation.
No issues with rubbing while on the larger chainring; none of the cogs.
Does anyone have an idea how I can resolve this issue?
Many thanks.
Ian
My setup:
With the low limit is set for a minimum clearance (less than 1mm) between the cage inner plate and the chain (with chain on the largest rear cog and small front chainring) I get no rubbing on all but 3 smallest cogs (still while on smaller front chainring); I can understand if the rubbing happened only on the extreme gear combo: smaller chainring and the smallest cog BUT all 3 smallest cogs?
In order to eliminate the rubbing on the 3rd smallest (rubbing only on 2 smallest) cog I must entirely eliminate the clearance between the cage inner plate and the chain (with chain still on the largest rear cog and small front chainring) and therefore introduce the rubbing on the smallest gear (largest rear cog and smaller chainring).
Moving the front derailleur higher on the seat tube or setting it slightly at an angle with respect to the chainrings does not produce better results.
It seems that the cage is slightly too narrow for its chain rub-free operation.
No issues with rubbing while on the larger chainring; none of the cogs.
Does anyone have an idea how I can resolve this issue?
Many thanks.
Ian
My setup:
- 2009 SRAM red gruppo (with FSA SLK-Light BB30 compact 34-50 crankset)
- SRAM red 11-28 cassette
- SRAM red braze-on front derailleur fastened using Parlee CF clamp