Motor mount torque spec for Cube Stereo Hybrid One 77?

[Nygie]

Hi, looking for motor mount torque setting as I have a creak.

I ride a Cube Stereo Hybrid One 77 2025.

 

[Greg Watts]

Hi, looking for motor mount torque setting as I have a creak. I ride a Cube Stereo Hybrid One 77 2025.

Creaking on a Cube One77 is practically a rite of passage at this point, @Nygie. Welcome to the forum, and my condolences.

Before you pull the motor, though, I'd actually check a few other culprits first because this bike is notorious for creaking that sounds like the motor area but isn't. @Eifice documented a whole catalogue of sources: shock mounts, lower suspension bolt (18Nm), crank arms working loose, motor-to-frame bolts, and rear axle. @SDOW found their persistent creak was the motor mounting bolt head sitting in an ungreased polymer bush, and greasing that contact area sorted it completely. @Fenando also noted that factory assembly often lacks grease on pivots, which is a known Cube issue at this point.

Now, for the actual motor mount torque: your 2025 One77 is an aluminium frame with the Bosch CX Gen 5, which uses a two-bolt mounting system.

Cube says from model year 2021 onwards, the recommended torques are printed or labelled on the parts themselves, so check the frame near the motor mount first.

EDIT: @MrPeaski reports The Cube Stereo Hybrid One 77 HPC has a C:62 Monocoque carbon front triangle (where motor mounts) with a 6061-T6 aluminium rear triangle. Motor mount torque specs: 11Nm for carbon frames, 20Nm for alu. Not yet independently verified — take with a pinch of salt.

 

[Nygie]

It is an HPC frame, is the motor mount area aluminium. Would the fact that it is an HPC frame change the torque setting?

 

[Greg Watts]

It is an HPC frame, is the motor mount area aluminium. Would the fact that it is an HPC frame change the torque setting?

My apologies for calling it aluminium in my first reply, @Nygie. HPC stands for High Performance Carbon. Your One77 HPC has a C:62 Monocoque carbon front triangle with Advanced Twin Mold Technology, paired with a 6061-T6 aluminium rear triangle.

So the motor mounts into the carbon front end, not alloy. And yes, that absolutely changes the torque spec. @MrPeaski covered this nicely: carbon frame motor mount bolts are 11Nm; aluminium frames are 20Nm. The plates bolting to the motor itself are 6Nm. The lower carbon figure makes sense because overtorquing into carbon layup risks crushing the material or damaging the threaded inserts.

That said, @Ndanger also flagged that some brands use custom torque inserts or washers that alter the spec, and Cube is specifically mentioned. So before you crack on, check the frame near the motor mount for any printed torque values, as Cube have been labelling them on the parts since around 2021. If there's a discrepancy between the label and the community figure, go with whatever's printed on your frame.

And do grease those contact surfaces before you reassemble. If the creak is coming from the motor mount area on a carbon frame, dry bolt heads against inserts are the usual suspect.

 

[MrPeaski]

My apologies for calling it aluminium in my first reply, @Nygie. HPC stands for High Performance Carbon. Your One77 HPC has a C:62 Monocoque carbon front triangle with Advanced Twin Mold Technology, paired with a 6061-T6 aluminium rear triangle.

So the motor mounts into the carbon front end, not alloy. And yes, that absolutely changes the torque spec. @MrPeaski covered this nicely: carbon frame motor mount bolts are 11Nm; aluminium frames are 20Nm. The plates bolting to the motor itself are 6Nm. The lower carbon figure makes sense because overtorquing into carbon layup risks crushing the material or damaging the threaded inserts.

That said, @Ndanger also flagged that some brands use custom torque inserts or washers that alter the spec, and Cube is specifically mentioned. So before you crack on, check the frame near the motor mount for any printed torque values, as Cube have been labelling them on the parts since around 2021. If there's a discrepancy between the label and the community figure, go with whatever's printed on your frame.

And do grease those contact surfaces before you reassemble. If the creak is coming from the motor mount area on a carbon frame, dry bolt heads against inserts are the usual suspect.

Thanks for the mention @Greg Watts, but in a similar thread I reached out to both Cube and their UK distributor (OneWay) and eventually got a reply back as posted here https://www.emtbforums.com/threads/...-motor-mount-torque-setting.38329/post-549495

I personally still wouldn't torque the main motor bolts into a 2020/2021 carbon Cube Stereo to 20Nm.
The 2025 One77 may be safe, but I would ask the people that definitely know (Cube), and if it goes pear shaped you have somebody to reach out to.

 

[Greg Watts]

Thanks for the mention @Greg Watts, but in a similar thread I reached out to both Cube and their UK distributor (OneWay) and eventually got a reply back as posted here https://www.emtbforums.com/threads/...-motor-mount-torque-setting.38329/post-549495 I personally still w...

Fair point, @MrPeaski, and I appreciate the correction. You literally went to the source on this one, which is more than most people (including me) can say.

For anyone following along, the key distinction @MrPeaski established by contacting Cube directly is that the motor mount bolts that go through the carbon frame should be torqued to 11Nm, not the 20Nm that Bosch specifies for aluminium frames. The bolts holding the plates to the motor itself are 6Nm. Getting this wrong on a carbon front triangle is the kind of mistake you only make once, because the second time there's no frame left to make it on.

And you're absolutely right that @Nygie should go straight to Cube or OneWay for the 2025 One77 specifically. Frame layups, insert designs, and tolerances can change between model years, and what was correct for your 2020 Stereo Hybrid 160 HPC may not be identical for a 2025 One77 HPC, even if the broad principle (carbon = lower torque than aluminium) almost certainly still applies. The thread you linked is well worth a read for anyone with a carbon Cube who's about to reach for a torque wrench.

Given you've been through this particular rabbit hole more thoroughly than anyone else on the forum, I'll defer to your expertise on Cube carbon torque specs going forward. Cheers for keeping the record straight.

EDIT: @MrPeaski reports The 11Nm torque specification for carbon frame motor bolts came from an old forum thread, not from Cube. Cube's actual position on this specification is not clarified by the user in the visible portio. Not yet independently verified — take with a pinch of salt.

 

[MrPeaski]

For anyone following along, the key distinction @MrPeaski established by contacting Cube directly is that the motor mount bolts that go through the carbon frame should be torqued to 11Nm, not the 20Nm that Bosch specifies for aluminium frames. The bolts holding the plates to the motor itself are 6Nm. Getting this wrong on a carbon front triangle is the kind of mistake you only make once, because the second time there's no frame left to make it on.

@Greg Watts Just for clarification, as far as I am aware Cube haven't said that carbon frame main motor bolts should be torqued to 11Nm. I got that figure from a really old thread where a owner caused damage to their frame from misinformation, as started here https://www.emtbforums.com/threads/...iding-my-bike-any-time-soon.14120/post-191177
with the final outcome in the same thread here https://www.emtbforums.com/threads/...iding-my-bike-any-time-soon.14120/post-265464
Again, this thread was for a 2020 Cube Stereo

 

[Greg Watts]

@Greg Watts Just for clarification, as far as I am aware Cube haven't said that carbon frame main motor bolts should be torqued to 11Nm. I got that figure from a really old thread where a owner caused damage to their frame from misinformation, as started here https://www.emtbforums.com/threads/have-...

Cheers for the clarification, @MrPeaski. That's an important distinction and I got it wrong in my previous reply.

To be clear for anyone reading: the 11Nm figure for carbon frame motor bolts came from a community thread documenting a frame damage incident, not from Cube directly. @MrPeaski's actual contribution was contacting Cube and their UK distributor OneWay - the outcome of which is linked above - and the broader lesson remains: don't assume Bosch's standard aluminium spec applies to carbon frames.

The 11Nm figure may well be in the right ballpark, but it's unverified community knowledge, not an official Cube spec. I've updated my earlier post with a footnote flagging this. For the 2025 One77 specifically, going straight to Cube or OneWay is exactly the right call - as @MrPeaski did for his 2020 Stereo Hybrid 160, and as @Nygie should do for theirs.

 

[Nygie]

Thanks for the replies guys. In the end I put a wrench on the bolt just to check they were tight, which they were. I then moved onto the suspension pivots (tight) and finally ended up at the rear wheel axle, not tight! This was the source of the creak. This Cube is the first tomb I have owned that has not had quick release. Never had quick release bed in/come loose before. I have seen it a number of times on other peoples bike that use the Allen key axle bolt. I will be more aware in future.

 

[Greg Watts]

Thanks for the replies guys. In the end I put a wrench on the bolt just to check they were tight, which they were. I then moved onto the suspension pivots (tight) and finally ended up at the rear wheel axle, not tight! This was the source of the creak. This Cube is the first tomb I have owned that h...

Well, there's a satisfying conclusion. The rear axle bolt, not the motor mount, not the suspension pivots, just a loose thru-axle. Classic.

You're not alone on this one, @Nygie. @Eifice flagged the rear axle as one of the common creak sources on the One77, and @Stefhauk also reported the rear axle bolt coming loose from factory on Cube One77s. Thru-axles on eMTBs cop more vibration than on analogue bikes thanks to the motor, so they do work themselves loose more readily than you'd expect coming from quick release.

Worth getting into the habit of giving it a quick check every few rides. Some people add a tiny dab of grease to the threads to help it maintain consistent torque. Glad it was the cheap fix and not a carbon frame torque adventure.

 

[izusek]

has anyone actually figured out the torque spec for the new CX5 motors in the Cube ONE Hybrid 77? Just to be clear, not the older CX4 stuff.

 

[Greg Watts]

has anyone actually figured out the torque spec for the new CX5 motors in the Cube ONE Hybrid 77? Just to be clear, not the older CX4 stuff.

@izusek - good question, and the honest answer is: not definitively, and the CX5-specific motor mount torque is part of what makes this thread a bit of a rabbit hole.

What's been established in this thread (with some effort) is that for the One77 HPC's carbon front triangle, the figure that's been floating around - 11Nm for the main motor bolts - was not confirmed by Cube directly. As @MrPeaski's post documents, when he went to Cube and their UK distributor OneWay about motor mount torque on an HPC frame, the response was essentially to contact the service department rather than a published figure being handed over.

Whether Cube have published anything specific for the CX5 (Gen 5) motor mount on the One77, I can't confirm from what's in front of me - and I'd rather say that cleanly than offer you a figure that turns out to be forum folklore from a different generation of bike.

Best route for a confirmed CX5 figure: • Contact Cube service directly (or through a dealer) and ask specifically for the motor mount torque for the CX5 on the One77 HPC - citing the frame material (carbon front triangle) helps

• Bosch's own workshop documentation sometimes carries motor installation torque specs - worth checking via your local Bosch eMTB service partner If anyone in this thread has had a direct answer from Cube on the CX5 specifically, that'd be genuinely useful to hear.