I snapped my rear 6 bolt rotor clean off whilst riding. Damn!!!!!

[B1rdie]

I see the problem.

It's not a Hope hub

Or a hub with no hope ?!

 

[Binhill1]

I do check bolts every few months never had one come loose . Ebike is first time i have used any threadlock on anything or used a torque wrench . Only thing i ever remember loosening was a peddle.

 

[Mikerb]

I do check bolts every few months never had one come loose . Ebike is first time i have used any threadlock on anything or used a torque wrench . Only thing i ever remember loosening was a peddle.

Peddle?..............you reduced your prices??

 

[folmonty]

While it might seem impossible for this to happen most eMTB's are twice the weight of analog bikes and they often need to stop at higher speeds. Braking force is all about heat (btu's) at the pads and rotor. Those rotor bolts can take tremendous abuse from those of you "go fast" riders from significant heat cycles. Suppose it could happen to anyone. Not a lot of metal in eMTB rotors to absorb that heat. The stress downhill riders put on has to be insane! Glad you didn't have an accident @Neeko DeVinchi

 

[Planemo]

I don't think the sheer strength of 6x 5mm high tensile (which would should be using - 8.8 spec) steel bolts should be a problem on our bikes, electrified and heavy or not. The best I can come up with for the above spec bolt is a sheer strength of 5.45kN which with my back of a fag packet calculations makes around 500Kg of force if torqued up correctly. Multiply by 6 and thats a fair bit. I would suggest that an alloy hub should fail before 6 bolts sheer.

In short, I believe the hub was shit or the bolts were shit, or a combination of both being shit. Either way, IMO we shouldn't be concerned with a 6 bolt format on our discs even with heavier ebikes.

 

[Nvigr8]

You can dissolve the remainder of the bolts out with muriatic acid if you want to salvage the hub.

 

[Binhill1]

I don't think the sheer strength of 6x 5mm high tensile (which would should be using - 8.8 spec) steel bolts should be a problem on our bikes, electrified and heavy or not. The best I can come up with for the above spec bolt is a sheer strength of 5.45kN which with my back of a fag packet calculations makes around 500Kg of force if torqued up correctly. Multiply by 6 and thats a fair bit. I would suggest that an alloy hub should fail before 6 bolts sheer.

In short, I believe the hub was shit or the bolts were shit, or a combination of both being shit. Either way, IMO we shouldn't be concerned with a 6 bolt format on our discs even with heavier ebikes.

Seen bolts sheer before when tightening them too much but 6 at once pretty dramatic . Are there any photos yet.

 

[Hamina]

Bare with me everyone, I'll make it a top priority to take pics tomorrow morning before shooting out and shooting a vid

Nevertheless, pics in the morning. Top priority

What timezone do you live in?

 

[B1rdie]

As we can’t see whats ahead, its safer to stop and lock this thread before the guessing looses control.

 

[Neeko DeVinchi]

No need to close the thread and sincere apologies for the delay.

So, the wheel itself has been deemed 'warranty replaceable' Halfords wording, not mine.

As a result, I asked them to take a pic and send it me via WhatsApp which they have cunningly took a picture from the drive side, thereby hiding the none drive side rotor area.


Nevertheless, hopefully, the above picture will answer some of your questions (kind of!!!).

I'll be honest with all of you, I picked this wheel up from my local Halfords a couple of months back for cheap.... so I've learned my lesson. Not saying that halfords sells cheap things but 'you get what you pay for in terms of quality & longevity.

I'm curious as to what wheel they'll provide me being as this particular wheel is discontinued.

Again, sincere apologies for the delay and most importantly a lack of a good picture.

 

[Zimmerframe]

Well .. clear as mud now ...

Zoomed in :

and at Maximum Zoom :

 

[Stihldog]

Glad you got the issue Resolved. It helps if you become a squeaky wheel.

Replacing your wheel/hub/rotor is probably cheaper than a recall since this design has been used by many for a long time.

 

[Gary]

Still can't work out if Neeko is infact one of the world's cleverest (ie. Most pointless) internet trolls
Good work if so

 

[Manc44]

BTW, did you rotate the disc clockwise a bit to remove residual play before tightening the screws? If not, a bit of slippage could lead to a sharp shear force and cut the screws.

Clockwise would create a gap to the bolts and create play. Anti-clockwise would close any gap. When brake pads grab the rotor, they pull the rotor anti-clockwise. Sorry I'm not trying to be a pedantic wanker.

EDIT: Sorry I got it wrong.

 

[Zimmerframe]

Clockwise would create a gap to the bolts and create play. Anti-clockwise would close any gap. When brake pads grab the rotor, they pull the rotor anti-clockwise. Sorry I'm not trying to be a pedantic wanker.

Wouldn't you want clockwise ? The wheel would be turning anti clockwise when you ride - when viewed from the disk side. So when you brake, it would be trying to stop the disk and applying the equivalent force to turning it clockwise ? Unless you have a digital watch of course, or ride in Australia.

 

[Manc44]

Yes a wheel goes anti-clockwise from the disc side, but when the rotor is pulled by the pads, they are pulling it clockwise. Roll a coin from right to left and put pressure on it at 3 O Clock like a brake, then more pressure... until it's so much you're pulling it in reverse - any rotor is being pulled clockwise.

 

[Mikerb]

Yes a wheel goes anti-clockwise from the disc side, but when the rotor is pulled by the pads, they are pulling it clockwise. Roll a coin from right to left and put pressure on it at 3 O Clock like a brake, then more pressure... until it's so much you're pulling it in reverse - any rotor is being pulled clockwise.

ie the opposite o what you said before

 

[Manc44]

Sorry man I just woke up lol. Edited.

 

[Binhill1]

Sorry man I just woke up lol. Edited.

Just go back to sleep your missing nothing pal.

 

[Mcharza]

Well .. clear as mud now ...

Zoomed in :

View attachment 76497

and at Maximum Zoom :

View attachment 76500

Great investigative journalism

 

[Planemo]

So we still don't know what happened then.

I wouldn't expect any branded wheel to fall apart at the disc mounting area, 'cheap' Boardman or not, so we remain confused without more pics/info.

 

[Gary]

You shouldn't need to rotate a rotor while torquing the bolts at all.