There is a recall by Cube:
List of affected bikes:
List of affected bikes:
Product safety recall – 2025 hybrids with ACID MTB HYBRID PRO crank arms
I almost lost my left crank arm after about 250 km. Now I check them regularly, and recommend Locktite.
Generally, use of that plastic cap that covers bolt, like on bikes for 150€ from supermarket, making it impossible to tell if it's loose or not. It is one of few but significant flaws of Cube bikes.
I'll soon be replacing those cheap bolts with a standard set of self-extracting ones.
Generally, use of that plastic cap that covers bolt, like on bikes for 150€ from supermarket, making it impossible to tell if it's loose or not. It is one of few but significant flaws of Cube bikes.
I'll soon be replacing those cheap bolts with a standard set of self-extracting ones.
MrsMac
New Member
Picking up a brand new cube stereo one44 tomorrow - better make sure this has been checked before heading out 
Does the issue require new hardware or is it a locktite / torque thing that is causing the problem?
MrsMac
New Member
I asked at my LBS when picked up new bike, they said the new/replacement hardware will be shipped out in September! So between now and then just check regularly !
- Thread starter
- #8
New hardware, i.e. screws/bolts.
Same here. Picked up this week a new bike, produced in May, and was told to receive the new screws sometime August / September. It is okay for me and I will keep an eye on it.
RamRod78
New Member
Yup... I discovered the 2 day-old recall while sat on a rock awaiting rescue at the trailhead 
The teeth on the crank were damaged, bolt nowhere to be seen. At least I discovered walk assist works fine....
LBS replaced the crank immediately and initiated a warranty claim under the recall. In Canada it seems the advice is to add Loctite, tighten to 50nm, and check regularly until the replacement bolts come in.
(not bad for a first post, eh?!)
The teeth on the crank were damaged, bolt nowhere to be seen. At least I discovered walk assist works fine....
LBS replaced the crank immediately and initiated a warranty claim under the recall. In Canada it seems the advice is to add Loctite, tighten to 50nm, and check regularly until the replacement bolts come in.
(not bad for a first post, eh?!)
A rather eventful start! Lets hope the next post is less problematicYup... I discovered the 2 day-old recall while sat on a rock awaiting rescue at the trailhead
The teeth on the crank were damaged, bolt nowhere to be seen. At least I discovered walk assist works fine....
LBS replaced the crank immediately and initiated a warranty claim under the recall. In Canada it seems the advice is to add Loctite, tighten to 50nm, and check regularly until the replacement bolts come in.
(not bad for a first post, eh?!)
RamRod78
New Member
I would have hoped so, but alas this problem isn't going away.... The new Acid crank and bolt have the same issue. Had to tighten 3 times after rides since. Blue loctite doesn't seem to make much difference.A rather eventful start! Lets hope the next post is less problematic
Trying to source 155mm cranks that aren't $400+ in Canada is a bit of an issue right now, so I cant even swap them out for something shiny.
To really rub it in, the rear brake rotor came loose mid-ride today too...
- Thread starter
- #12
Not all vibes are good vibes.I would have hoped so, but alas this problem isn't going away.... The new Acid crank and bolt have the same issue. Had to tighten 3 times after rides since. Blue loctite doesn't seem to make much difference.
Trying to source 155mm cranks that aren't $400+ in Canada is a bit of an issue right now, so I cant even swap them out for something shiny.
To really rub it in, the rear brake rotor came loose mid-ride today too...
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Optiker
New Member
Hi, have you used the self-tightening screws before? If so, with what result? Thanks
- Thread starter
- #14
Hi,
If I got it right this shop is offering the new version of the bolts:
nanobike.de
If I got it right this shop is offering the new version of the bolts:
Cube/Bosch Kurbelschraube für Gen4 Prowheel | M15 black
Cube/Bosch Kurbelschraube für Gen4 Prowheel | M15 black Passend für Cube E-Bikes mit ACID Prowheel MTB Hybrid-Kurbeln (markiert).…
nanobike.de
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Optiker
New Member
Thank you, I‘ve just ordered them. Is it necessary to apply Loctite?Hi,
If I got it right this shop is offering the new version of the bolts:
Cube/Bosch Kurbelschraube für Gen4 Prowheel | M15 black
Cube/Bosch Kurbelschraube für Gen4 Prowheel | M15 black Passend für Cube E-Bikes mit ACID Prowheel MTB Hybrid-Kurbeln (markiert).…
- Thread starter
- #16
Usually there is some stuff on the threads, afaik with microcapsules. If there is nothing on it I also would go for some locktite.
The SRAM eagle 90 cranks come in 150mm and 155mm and should be quite cheap.I would have hoped so, but alas this problem isn't going away.... The new Acid crank and bolt have the same issue. Had to tighten 3 times after rides since. Blue loctite doesn't seem to make much difference.
Trying to source 155mm cranks that aren't $400+ in Canada is a bit of an issue right now, so I cant even swap them out for something shiny.
To really rub it in, the rear brake rotor came loose mid-ride today too...
- Thread starter
- #18
Just in case! Cube is marking the new screws / replacing screws with a paint spot in the center. This might lead a bike shop to replace screws not being marked, i.e. if not being told not to do so.
António13_PT
New Member
I changed the bolts and they really weren't tight enough; they came out with minimal force.
I installed some self-extracting ones, and tightened them to 50 Nm (they are marked at 54 Nm), which was much more than they were before.
If you haven't changed them yet, check the tightness regularly and change them as soon as possible.
I installed some self-extracting ones, and tightened them to 50 Nm (they are marked at 54 Nm), which was much more than they were before.
If you haven't changed them yet, check the tightness regularly and change them as soon as possible.
RamRod78
New Member
My new SRAM XO 155mm cranks arrived yesterday and the tightness of new, correctly manufactured bolts is a night and day difference....
- Thread starter
- #21
According to dealer instructions by Cube the screws are to be replaced and tightened with 50Nm. In case crank is not aligned correctly to the axle the torque shall be increased to 60Nm. If alignment is still not correct the crank arms shall be replaced.
Looks like the problem is not with the screws but with bad tolerances of the ISIS link on 2025 crank arms
- that should be replaced by Cube instead of the screws and not holding the manufacturer of the crank arms responsible.
Looks like the problem is not with the screws but with bad tolerances of the ISIS link on 2025 crank arms
- that should be replaced by Cube instead of the screws and not holding the manufacturer of the crank arms responsible.Old Codger
Member
My Bosch dealer told me that the problem was that Bosch had used the wrong Locktite which was too thick and affected the torque by up to 10Nm. They were instructed to torque to 55 or 60Nm or fit new bolts with the proper lock solution.
Personally I don’t see what can be wrong with a bolt provided it is the correct thread and torqued correctly, as long as it’s not plastic. If something kept coming loose I would put a lock washer on it and adjust the torque.
I wonder if we will ever get to know the real reason for the fuss.
Personally I don’t see what can be wrong with a bolt provided it is the correct thread and torqued correctly, as long as it’s not plastic. If something kept coming loose I would put a lock washer on it and adjust the torque.
I wonder if we will ever get to know the real reason for the fuss.
Hey, if they say so it has to be correct. We seem to believe what we want to hear, and if it makes us happy - lol
Purple parznip
Active member
Acid cranks are utter crap,mine stripped the pedal threads within 3 months,got e thirteen cranks instead,never had an issue,i dont know what spec of aluminium acid use,but the metal is too soft,i have heard of other riders having the same issue,praxis arent much better either.There is a recall by Cube:
List of affected bikes:
Old Codger
Member
My old bike and my partner’s bike are both 10 years old with Acid crank arms so crap cranks is not a given.
A problem can happen with every component made, even Hope, that doesn’t make them all crap. Perhaps you have more pedal strikes than me.
- Thread starter
- #27
Looks like not all. My local shop as list from Cube by serial number and my bike was checked . Also torque checked.
- Thread starter
- #29
When was your bike assembled at Cube works? Maybe after they found that the bolts / crank arms are faulty.
Do you have a paint spot on the bolt in the axle? If yes, it is the new version.
The note on Cube website of date if purchase is not correct. I bought a trekking ebike in August and it is subject to the recall, i.e. I am waiting to receive a call from the dealer to come in for replacement.
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Old Codger
Member
Nothing wrong with either the crank arm or the retaining bolt. Notice that Cube only want them returned for inspection.
Too much of the wrong Loctite was used effecting the torque on the screw by up to 10Nm. The recommended tighten to 55Nm solves the problem.
Ive heard all sorts of stories from faulty crank arms to wrong thread and even the use of self tapping screws.