XTR not downshifting on Scott Spark

[Chain-L]

I have a scott spark 900 with that terrible cable routing through the headset🙈
Since i bought it, it has never shifted down smoothly. Sometimes takes more than one pedal stroke and then shift hesitantly (I think its due to the cable not releasing properly due to the tight angles through the headset). I am at the point where i want to ditch the xtr to replace with sram, but was thinking maybe it is just a new cable, quality housing, proper routing and cheecking the alingment of the mech and hanger.

Has anyone experienced this issue before and what can i do to resolve it? I have replaced the cable and the bike shop checked and adjusted the hanger and mech, but still not right. 
Damn frustrating when you want to shift and the gears just “hang” like and old Windows computer!

[BaGearA]

I would strongly consider a axs upgrade, vut you can get a jagwire pro dropper kit 

 

.4mm cable and tiny housing that always worked lekker for me , expensive tho

[MORNE]

Assuming they replaced the cable and housing, and also aligned everything like you said they did, and then hopefully did their duty and took 2 seconds to make sure the indexing is right, 12 speed? -  check the clutch. Maybe it needs a clean and lube.

google how to. but take that little cover off and clean it/lube it. 

 

[MORNE]

3 minutes ago, BaGearA said:

I would strongly consider a axs upgrade, vut you can get a jagwire pro dropper kit 

 

.4mm cable and tiny housing that always worked lekker for me , expensive tho

R200 is worth a try before dropping R10k minumum? Also, OP, if your xtr is mint and 12 speed i’ll swop you for my gx axs. I hate mine. Haha😅

Edited August 11, 2023 by MORNE

[Jono]

What @MORNE  said. Its also worthwhile quickly checking (it literally only takes a minute) that the b limit is set correctly. Shift into biggest cog and check that the largest tooth lines up with the line on the back of the derailleur. https://www.google.com/search?q=b+limit+m9100 

[Grease_Monkey]

Most likely your clutch that needs a service. They do tend to get a bit lazy - it's an easy fix. Work with that headset routing daily - never seen it to be the cause of bad shifting unless the cable is actually kinked. 

[PhilipV]

Easiest test to see if it’s the clutch is to switch it off and shift through the gears.  If it shifts fine without clutch, then you need to give the clutch some love. 

[Bicycle Yard WESTERN CAPE]

46 minutes ago, Chain-L said:

I have a scott spark 900 with that terrible cable routing through the headset🙈
Since i bought it, it has never shifted down smoothly. Sometimes takes more than one pedal stroke and then shift hesitantly (I think its due to the cable not releasing properly due to the tight angles through the headset). I am at the point where i want to ditch the xtr to replace with sram, but was thinking maybe it is just a new cable, quality housing, proper routing and cheecking the alingment of the mech and hanger.

Has anyone experienced this issue before and what can i do to resolve it? I have replaced the cable and the bike shop checked and adjusted the hanger and mech, but still not right. 
Damn frustrating when you want to shift and the gears just “hang” like and old Windows computer!

Did you buy new or used ? 

[TheoG]

5 hours ago, BaGearA said:

I would strongly consider a axs upgrade, vut you can get a jagwire pro dropper kit 

 

.4mm cable and tiny housing that always worked lekker for me , expensive tho

Agree, one of the best things I ever did is to buy a AXS derailleur, I paid ~R9k and its worth every penny.  Shifting is awesome every single time and best part no cables or even wires compared to Di2.