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edscoble-
Unlikely that a frog would cause those issues. Most likely it’s a bent hanger, insufficient cable tension, or both.
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Its a specialized. I'll take another look at it. It originally came with grip shift and couldn't shift into big cog. Switched to thimbshifter and had a play around with the derailer setup but the problem persists.
Muc-ed-off
sacredhart
Kids bike rear derrailer is hard to shift into biggest cog. All other gears are fine but shifting into the biggest rear cog requires to much effort (thumbshifter) for kid to do it. What could cause this? Thanks