Road Bike Won T Shift To Small Ring

If the derailleur doesn t shift automatically to the small ring it is your derailleur.

Road bike won t shift to small ring. When your rear derailleur is in the smallest sprockets colored blue in the image above and you attempt to shift from the big to the small chain ring you will notice that it does not shift the front derailleur. I m experiencing a serious lack of sur la plaque i can still move the shift and the cage does move over the top of the two chainrings but the chain itself won t move. I show how to easily fix many indexing type shifters that won t shift. Front gears won t shift.

Diagnosing and repairing a front shifting system that used to work fine but now will not move to shift down to the small ring. It has to be pulled with extreme effort and won t shift to the middle chainring from the outer large one. My ultegra di2 seems to shift fine through the cassette whilst in the stand. It may be necessary to back it off to allow the chain to reach the big ring.

Sensitive to small changes in position and cable tension. Gear position control does not just affect your shifting when you re already in the small ring it also changes how your bike shifts from big to small chain ring. Adjust a shimano 105 9x rear derailleur. Shift your front derailleur to the smallest ring and your rear to a cog near the middle of the cassette then slacken the front derailleur cable by winding the barrel adjuster fully clockwise.

In this case it s a road bike sti brifter but it also works for mountain bike trigger shifters as well. Check by disconnecting the shift cable. I will often just hear the clicking noise of it trying to change into gear. If it does check first the cable then the shifter.

On the road however it struggles to go into the smallest sprocket when in the big chain ring. If the chain won t shift or feels sluggish. If i stop and get off the bike lift the rear wheel and rotate the cranks it will then shift into it without a problem. A friend s bike had the same problem trouble was a broken spring on the front derailleur.

It just doesn t like shifting to the large ar go large to medium. Can you move the derailleur cage after you detach the cable. As far as i know all road front derailleurs are low normal which means the cable should loosen when shifting to small ring.