Chain skipping under load after bike service

2200km and the chain is skipping?
Not surprising, Sounds like a worn out drive train to me.

It also sounds like you don't have a very good bike shop. They should easily pick this up and suggest replacement.
 
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RustyIron said:
Your first mistake was taking it to a the bike store boys. You have the tools. You know what to do.

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I appreciate the suggestion, but is not that simple.

I could have done the gear tuning at home, but not sort out the original problems. I did not want to disassemble the motor to clean it. A lot of people had problems after doing that. Now, I could have tuned it by myself but I wanted them to do the job just in case more complex issues raise.

Plus, not everyone has a large home with a large garage where to arrange a nice benchroom like the typical US houses. I moved here recently and temporarily. I am renting and my garage is filled with boxes ready for the next removal.
 
RustyMTB said:
I kind of agree but you haven't experienced a failure, your drivetrain has shifted from working fine to working but with problems. It's what drivetrains do, there are endless threads on the subject in here. What you could do is spend time learning how they work, how to adjust them for best performance, their weaknesses & failure points. That way you wouldn't need a shop nor a thread every time something happens to your bike. Youtube is a digital Narnia for this stuff, there are endless tutorials on how to look after bikes, why not watch a few of them instead of coming here for advice & then questioning it?!
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Another guy in my ignore list. Bye.
 
pagheca said:
I appreciate the suggestion, but is not that simple.

I could have done the gear tuning at home, but not sort out the original problems. I did not want to disassemble the motor to clean it. A lot of people had problems after doing that. Now, I could have tuned it by myself but I wanted them to do the job just in case more complex issues raise.

Plus, not everyone has a large home with a large garage where to arrange a nice benchroom like the typical US houses. I moved here recently and temporarily. I am renting and my garage is filled with boxes ready for the next removal.
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We get that, but there's going to come times where you can't get to an LBS, like when you're on a trip or adventure and the bike starts playing up in a morning when you've got to ride. You really want to learn and gain the experience of getting things better for yourself for these scenarios as it can destroy a great trip and could be something fairly simple. To do the gears you need a stand of some description, which can be as simple as a piece of wood holding the bike seat up so the wheel is off the floor, and a 3mm allen key. That's it really. But there's little nuances that can kill a weekends riding but be fixed in less than 30s of effort.
We're not all saying you need to be a WC level mechanic, but some knowledge is really important in MTBing.
Think about being 1000' up and you stack your bike on a trail and knock the mech out of alignment, you don't have a mech hanger tool, but armed with some knowledge you'll at least get back home.
 
Yeah, I know that. But again: disassembling and cleaning a motor is not the kind of thing you do while "being 1000' up". And I want the shop to fix the problems they created.
 
If ever a thread epitomised the aphorism don't let perfect be the enemy of good. This guy wants his cake & eat it, asks for advice but won't accept it when offered & insists anything that goes wrong with his bike is someone else's problem before throwing his toys out of the pram repeatedly. What a crock.
 
pagheca said:
maybe. You too. 🤷‍♀️
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My point was, your motor wasn't part of the issue of 'skipping'. Unless i'm very confused.

One other point, your rear wheel cannot be misaligned, you've got a thru-axle into a UDH, therefore there cannot possibly ever in any world be a misalignement there. There can of course be a wheel being untrue, or something else causing the issue, but not a misaligned wheel in the old context of a QR axle/dropouts.

But you can't just focus on "i wouldn't fix a motor 1000m up" as that's just crazy talk, that's like saying you wouldn't replace your brake pads, or wouldn't fix a puncture... It's 1 aspect of a working bike. The motor isn't the issue here in this debate, whatever issue that was you were getting 'serviced' isn't part of the problems you're having. Therefore the debate about fixing and knowing about the other things is equally as valid as it ever way, maybe even more so.

MTBs and gears etc are not rocket science, they're something you learn as you need to, without this knowledge, you're on a waiting list at an LBS and in the hands of good/bad mechanics and 16 year olds who don't know what they'e doing.. it's a lesson many of us have learned in the last 10, 20, 30 years and means a lot of us never need to go to an LBS... we're not trying to be superior here or belittle you, we're trying to help.
 
Weeksy said:
My point was, your motor wasn't part of the issue of 'skipping'. Unless i'm very confused.

One other point, your rear wheel cannot be misaligned, you've got a thru-axle into a UDH, therefore there cannot possibly ever in any world be a misalignement there. There can of course be a wheel being untrue, or something else causing the issue, but not a misaligned wheel in the old context of a QR axle/dropouts.

But you can't just focus on "i wouldn't fix a motor 1000m up" as that's just crazy talk, that's like saying you wouldn't replace your brake pads, or wouldn't fix a puncture... It's 1 aspect of a working bike. The motor isn't the issue here in this debate, whatever issue that was you were getting 'serviced' isn't part of the problems you're having. Therefore the debate about fixing and knowing about the other things is equally as valid as it ever way, maybe even more so.

MTBs and gears etc are not rocket science, they're something you learn as you need to, without this knowledge, you're on a waiting list at an LBS and in the hands of good/bad mechanics and 16 year olds who don't know what they'e doing.. it's a lesson many of us have learned in the last 10, 20, 30 years and means a lot of us never need to go to an LBS... we're not trying to be superior here or belittle you, we're trying to help.
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Sorry, but I'd like to put an end to this pointless back-and-forth.

I actually agree with what you're saying: if you own a bike, you should know how to maintain it. But what I'd like people to understand is that not everyone's situation is the same.

I use my bike pretty much every day: for commuting, having fun, training, and everything else. And please don't tell me I should own eight different bikes for all those purposes, because first, I don't want to, and second, I simply don't have the space. I am not telling others what to do either. Other people, other priorities. And other choices.

As for maintenance, you will probably not trust me, but I know perfectly well how to change a tire (I've done it several times), replace brake pads (done that too), bleed the brakes (the only reason I haven't done that myself is because I didn't want to risk making a complete mess in my garage) etc.

One piece of advice, for everyone: please remember that people don't necessarily tell you every detail of their lives. Not everyone's home, family situation, finances (fortunately that's not my case, but it may well be for others), work commitments, or circumstances are the same.

This constant tendency by some forum members to lecture everyone else makes the atmosphere here far less constructive. I'm not the only one who's noticed it. How about trying to make this a more understanding and empathetic place? After all... come on... we're talking about bicycles, not how to survive a war or cure cancer.

A slightly more relaxed, helpful attitude from everyone would go a long way. Yes, I already know the reply: "Well, you're the one who..." Fair enough, maybe that's true, and if so, I apologize.

But let's all try not to turn every request for technical advice into a territorial pissing contest.

Thanks, and apologies for the rant. I'll leave it there unless anyone has something useful to add about the actual technical issue.
 
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what's so funny about that, @Weeksy?

It looks like some people here is still at the primary school. Really. And this forum is becoming a very unpleasant place to be. A pity.
 
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pagheca said:
what is so funny about that, @Weeksy?

It looks like some people here is still at the primary school. Really. This forum is becoming a very unpleasant place to be. A pity.
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mate, i offered you a LOT of ideas, thoughts and suggestions as did everyone else. You asked what it could be but did nothing with the information anyone provided.
Look at the little cable end for example, if someone has serviced that drivetrain, that involves a new gear cable and a new end-cap, but that's not been done. Looking at your high and low screws i suspect they're both wrong too and you've been told about the B screw by multiple people.
You can google and check the B screw by putting the bike in the largest cog and checking what the gap it, either by eye or the little plastic tool... but you're not going to do that, you're going to take it to the same shit shop that did a shit job.
 
Guess how far back through the thread you have to scroll before finding the last time this guy was advised on how to adjust his B tension? Bonus points for who did that. That's right, DIS GUY!
 
Picked up the bike from the shop today. Everything's sorted. A few of the derailleur adjustment screws had been set incorrectly, but they fixed everything and apologized.

I tested the bike on a steep climb, including under the highest torque I can put through it with the motor in Turbo mode, and not a single chain skip.

Thanks to everyone for the advice, it really helped me ask the right questions at the shop and learn a lot.
 
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