GX AXS issues (the MK1 model)

[EMTBSEAN]

Hi everyone, Well after just 3 years my GX AXS derailleur has decided to start acting the goat, I noticed it while out on a ride a couple of weeks ago, at first I thought I’d bent my hanger, with a new hanger fitted it’s no different, the issue is with changing gear, it won’t go into the highest or lowest gears, it’s also not going from the lowest gears to the highest straight away, I’ve tried the micro adjustment on the controller and the battery, adjusting the limit screws and the B screw, re-pairing, cleaning the battery terminals which were clean, making sure the batteries are fully charged and even giving it a really good deep clean to make sure there was no small bits of grit I missed stopping it operating correctly, I’m surprised it’s acting up as it’s been well looked after and kept clean and has worked flawlessly before this and looking at it it looks in great condition, anyway I was wondering if anyone else has had this issue and fixed it before I pay nearly £400 for another one, as usual any help would be appreciated please.

 

[Mikerb]

My first thought would be the chain. Is the chain still below 0.5%?? Might be worth trying a new chain.
You could also check that the mech is free to move ( ie the pivot points of the parallelogram). ........forward and back and in across the cassette and back. Check also the mech spring is not clogged with dirt or disconnected. Lastly, is the guide jockey ( top one) free moving and without sideplay in its bearing. Removing both jockey wheels and either replacing or repacking the bearings might be worthwhile.
It may be worth removing the mech and giving it an overhaul and checking its operation without having to move the chain.

 

[EMTBSEAN]

My first thought would be the chain. Is the chain still below 0.5%?? Might be worth trying a new chain.
You could also check that the mech is free to move ( ie the pivot points of the parallelogram). ........forward and back and in across the cassette and back. Check also the mech spring is not clogged with dirt or disconnected. Lastly, is the guide jockey ( top one) free moving and without sideplay in its bearing. Removing both jockey wheels and either replacing or repacking the bearings might be worthwhile.
It may be worth removing the mech and giving it an overhaul and checking its operation without having to move the chain.

I’ve just got back from my workshop after reading your post and after removing the mech and flushing it or more specifically the spring with some GT85 I was amazed how much grit came from under the spring, I am shocked because it’s not long ago I took it off and gave it a good clean like I usually do and nothing like this has happened before, the acid test will be my next ride, just to be safe I’ll make it local, needless to say Mike I really appreciate your suggestions mate, all the other suggestions were carried out and they were all fine, thanks again pal

 

[Montana St Alum]

My first thought would be the chain. Is the chain still below 0.5%?? Might be worth trying a new chain.
You could also check that the mech is free to move ( ie the pivot points of the parallelogram). ........forward and back and in across the cassette and back. Check also the mech spring is not clogged with dirt or disconnected. Lastly, is the guide jockey ( top one) free moving and without sideplay in its bearing. Removing both jockey wheels and either replacing or repacking the bearings might be worthwhile.
It may be worth removing the mech and giving it an overhaul and checking its operation without having to move the chain.

Good call. I find that shifting issues often begin before the chain has stretched enough to register. Maybe some of the sides of the links begin to deform slightly or something.

 

[High Rock Ruti]

Hi everyone, Well after just 3 years my GX AXS derailleur has decided to start acting the goat, I noticed it while out on a ride a couple of weeks ago, at first I thought I’d bent my hanger, with a new hanger fitted it’s no different, the issue is with changing gear, it won’t go into the highest or lowest gears, it’s also not going from the lowest gears to the highest straight away, I’ve tried the micro adjustment on the controller and the battery, adjusting the limit screws and the B screw, re-pairing, cleaning the battery terminals which were clean, making sure the batteries are fully charged and even giving it a really good deep clean to make sure there was no small bits of grit I missed stopping it operating correctly, I’m surprised it’s acting up as it’s been well looked after and kept clean and has worked flawlessly before this and looking at it it looks in great condition, anyway I was wondering if anyone else has had this issue and fixed it before I pay nearly £400 for another one, as usual any help would be appreciated please.

High Rock Ruti

3 years sounds amazing from my experience!

Warm Regards Ruti

 

[K_Zissou]

I’m having a similar issue with shifting performance, I’ve managed to get the gears 90% dialled but a couple of shifts aren’t smooth or take time to actually shift over, maybe 3 seconds or sometimes don’t shift at all.
I’ve taken to double shifting up and then shifting down to get into problem gear 3 for example.

Anyway my mechanic said that the pins on the derailleur for the GX AXS are vulnerable to bending and this can weaken the shift with age or crashing.
It’s just out of warranty now and I’ve tried to see if there is a service for the specific problem to solve it, i begrudge having to purchase another one to correct the problem.

Anyway good luck with your problem.

If I find any extra info on the matter il share it here.

 

[EMTBSEAN]

I’m having a similar issue with shifting performance, I’ve managed to get the gears 90% dialled but a couple of shifts aren’t smooth or take time to actually shift over, maybe 3 seconds or sometimes don’t shift at all.
I’ve taken to double shifting up and then shifting down to get into problem gear 3 for example.

Anyway my mechanic said that the pins on the derailleur for the GX AXS are vulnerable to bending and this can weaken the shift with age or crashing.
It’s just out of warranty now and I’ve tried to see if there is a service for the specific problem to solve it, i begrudge having to purchase another one to correct the problem.

Anyway good luck with your problem.

If I find any extra info on the matter il share it here.

I’d recommend trying what I did first, I took my derailleur off and give it a good flush out with a good quality degreaser especially around the spring and I was amazed how much grit came out, I applied some light oil and it’s been fine since

 

[Jackware]

Start with the basics - put a new hanger on the bike.

 

[K_Zissou]

Thanks guys

In my case it was professionally looked at, all the above tried and problem still exists which did improve marginally but it’s not 100%

 

[High Rock Ruti]

I’m having a similar issue with shifting performance, I’ve managed to get the gears 90% dialled but a couple of shifts aren’t smooth or take time to actually shift over, maybe 3 seconds or sometimes don’t shift at all.
I’ve taken to double shifting up and then shifting down to get into problem gear 3 for example.

Anyway my mechanic said that the pins on the derailleur for the GX AXS are vulnerable to bending and this can weaken the shift with age or crashing.
It’s just out of warranty now and I’ve tried to see if there is a service for the specific problem to solve it, i begrudge having to purchase another one to correct the problem.

Anyway good luck with your problem.

If I find any extra info on the matter il share it here.

High Rock Ruti

My understanding is that most parts are available. When you say "pins" you mean the pins in the trapezoid?

Warm Regards Ruti

 

[Doomanic]

My GX AXS does the same. The only things I haven't replaced are the mech and the frame...

 

[Hiltix]

Watch THIS Thread

 

[High Rock Ruti]

My GX AXS does the same. The only things I haven't replaced are the mech and the frame...

High Rock Ruti

Hey doom, how you been man?

Warm Regards Ruti

 

[Mikerb]

High Rock Ruti

My understanding is that most parts are available. When you say "pins" you mean the pins in the trapezoid?

Warm Regards Ruti

he is talking a bout the pins that hold the cassette in one piece.

 

[Mikerb]

I suspect some of the problems are caused by not setting up with the shock at SAG. That also means testing the gearchange when on a stand ( shock not at SAG) is not a good guide. Best test is a ctually riding the bike in full gear.
I think cleaning and lubing the mech is often something overlooked. The area inside inside the parallelagram is a trap for all trail debris!!

 

[EMTBSEAN]

I suspect some of the problems are caused by not setting up with the shock at SAG. That also means testing the gearchange when on a stand ( shock not at SAG) is not a good guide. Best test is a ctually riding the bike in full gear.
I think cleaning and lubing the mech is often something overlooked. The area inside inside the parallelagram is a trap for all trail debris!!

Yep that’s what happened to my derailleur Mike

 

[High Rock Ruti]

he is talking a bout the pins that hold the cassette in one piece.

High Rock Ruti

Sorry misunderstood, you mean the cassette I just had replaced under warranty because 30 percent of the 3rd gear broke off ,those pins (rivets technically). About 700 miles.
But hey they saved 23 grams....?
A $400 USD cassette that can't be down graded.

Warm Regards Ruti