I got my bike from LBS today after regular service.
The bike fell badly on the floor home yesterday on the driver side.
It shifted ok when I road it to the LBS and the Mech told me that the derailleur hanger was not bent.
The rear derailleur shifts well into lower easier gear but not down to harder gear. I have to overshift in order for the bike to shift.
One thing the chain on the was too long so I got the the chain shortened but that should not have any impact on the gear shifts.

Any ideas why the rear derailleur is not working properly?

Still sounds like a bent derailleur hanger, unless you actually damaged the derailleur itself.

It's might be the reason for the shifting problem.
I'm going to take the bike back to LBS tomorrow and see what they will do.

So how are the shifting into the harder gears done? "but not down to harder gear. I have to overshift in order for the bike to shift." Shift two cogs up then down shift one back? Most indexed systems only allow over lever travel (and the resulting der movement) when shifting to easier/lower cogs. Or do you have some sort of rapid rise mongrel.


How did the mechanic determine that the hanger was not bent? Does he know that hanger alignment is not the sole determinate to der alignment?


Chain length most certainly can effect shifting grade. If the rear der has a cage with it's pivot off set from the guide pulley's pivot then as the cage plays out with chain wrap needs the gap between the guide pulley and the cog set's underside will change. How the chain length is set WRT this gap is a factor.


There's more at play but chew on this for a while. Andy

I went back to the LBS to get the gears fixed. The mech used park tool hanger alignment tool to see if everything was ok down. He could not see that anything was bent.
He told that me that everything was straight down there like wheel and the derailleur. The rear derailleur shifts now to all the gears but with a delay to the higher ones (smaller cog) . Maybe I need to replace the shift cable?

More likely than the shift cable causing your problem is the cable housing. That little curved section immediately adjacent to the rear derailleur is particularly problematic.

The shift cable and housing was replaced in beginning of May as well as the derailleur. I've ridden about 1000km on that bike since this was replaced.

Edit: I turned the barrel adjuster all the way inn and shifted to the smallest cog then turned the barrel adjuster out until it shifted to next cog and the gears seams to be working now fine. I'm going to commute on the bike later today and see how the gears works.

Typically it's the cable and housing. Otherwise it's the adjuster, which have worked for me. If you are having troubles, then please let us know, what was it - I can't guess any other suspects

I did 11km commute up and down a hilly terrain. The gears worked but the shifting is a little slow in some gears after I did adjust the cable tension with the barrel adjuster.
I guess the cassette on the bike is getting worn out.
The LBS will replace the cable for me If I still have problem with the gears.

If you have a lot of miles, you may have cassette or chain wear affecting shifting, but if that were the case I would HOPE the mechanic caught it. Have you inspected the cassette cogs for wear? How many miles do you have on the current cassette and chain?

Friction shifting , ... Simplicity ... FTW!

I don't know how many miles I have on my current cassette but on my current chain I have about 1300km.
I guess I have done something like 3000-4000km on my cassette. I have had 3 chains on the cassette but only 2 for some mileage cause I broke the second chain and it was not even 0.5 worn.

I got my gears to work but then the cable became loose from bolt that holds it. Then the gears wear jumping up and down on the cassette not working properly after I tightened the cable.
I went with the bike to the LBS and they replaced the cable and the housing for free.

if the bolt that holds the shifter is too tight, there can be too much friction in the shifter for the derailleur spring to pull the shifter all the way to the detente, preventing shifting to a smaller rear cog - so you get the click, but not the shift

The gears works much better now smooth as is going to get with as I only have Altus on the bike.
The gear cable was also little bit frayed so that might have caused the shift issue.