[Levalines]

Hi guys, i have found this crack recently on my insurgent
i have no idea how it happened, i dont remeber any crashes or impacts which could have caused it, also there where no scraches or paint damages if it could be due to an impact. it somehow happened on its own,
Does anyone has an idea how this could have happened?
Is it possible to repair safely or new frame is a must in this case?

 

[dietz31684]

Kind of looks like it was clamped there in a stand. My nonexpert $0.02

 

[Cleared2land]

Atmospheric pressure anomaly

 

[speedygz]

Kind of looks like it was clamped there in a stand. My nonexpert $0.02

Yeah, the cracks are directly in line with the cable brackets. Clamping there puts all the pressure on that tiny little spot, not evenly distributed over the whole surface of the clamp

 

[Levalines]

ddd

 

[Amt0571]

Yes perhaps that's the reason however it wasn't clamped strongly, amount of pressure would only be from the weight of the bike, or just a bit more, also the crack is only on one side. Can it be repaired? with carbo repair kit?

Maybe it's possible to repair. In any case, I think a new frame is always cheaper than a dentist and a plastic surgeon. I wouldn't ride that frame.

For things like this, I don't like carbon. But that's another story.

 

[speedygz]

Yes perhaps that's the reason however it wasn't clamped strongly, amount of pressure would only be from the weight of the bike, or just a bit more, also the crack is only on one side. Can it be repaired? with carbo repair kit?

Did you, or anyone else work on the bike while it was clamped in the stand? Any force applied to bolts etc on the bike will be magnified greatly through leverage to the clamp. Carbon frames should only be clamped via the seat post. Not by the top tube.

 

[bjcccat]

Does look like a clamp crush... But only owner or those who have had access would know.

In very very rare instances, an inelastic frame flex can cause carbon splintering, this would require hard bottom out while seated... 1:1000 seated bottom outs could result in this... So unlikely...

Carbon repair is available from some frame workers, but repair and repaint would be 800-1500 easily. Call Evil about a possible warranty or crash replacement first.

Also, I wouldn’t mountain bike on this, if it full lets loose it could possibly cut into your thigh with potential life threatening consequence...

Sorry this happened.

 

[Levalines]

Does look like a clamp crush... But only owner or those who have had access would know.

In very very rare instances, an inelastic frame flex can cause carbon splintering, this would require hard bottom out while seated... 1:1000 seated bottom outs could result in this... So unlikely...

Carbon repair is available from some frame workers, but repair and repaint would be 800-1500 easily. Call Evil about a possible warranty or crash replacement first.

Also, I wouldn't mountain bike on this, if it full lets loose it could possibly cut into your thigh with potential life threatening consequence...

Sorry this happened.

Thanks

 

[Levalines]

Maybe it's possible to repair. In any case, I think a new frame is always cheaper than a dentist and a plastic surgeon. I wouldn't ride that frame.

For things like this, I don't like carbon. But that's another story.

Thanks

 

[speedygz]

The repair itself shouldn't be crazy expensive, the paint touchup after seems to where the $$ add up.

 

[Levalines]

The repair itself shouldn't be crazy expensive, the paint touchup after seems to where the $$ add up.

Yep, but as guys say the repair also seems to be risky, considering the ride style Evil is build for

 

[speedygz]

Yep, but as guys say the repair also seems to be risky, considering the ride style Evil is build for

Done properly, it should be as good and strong as new.

 

[Levalines]

ff

 

[Amt0571]

Done properly, it should be as good and strong as new.

I kindly disagree about the repair strength, You have no way of measuring how strong it's after the fact.

The ground is hard, specially when you fall unexpectedly, and life is short enough to risk shortening it further.

 

[speedygz]

thats how it was clamped, but with no power, the work was only done with wheels so we took off the tyres and wheels togather and thats all. also this clamp has V shape type of clamp so should not have pushed the cable bracket that much i guess

Unfortunately, that's the most likely culprit. When you're working at either end of the bike, it's the equivalent of attaching a long lever. Look at the ratio between the width of the clamp, to the distance from the clamp to the axle centers. If that makes any sense.

 

[Levalines]

Unfortunately, that's the most likely culprit. When you're working at either end of the bike, it's the equivalent of attaching a long lever. Look at the ratio between the width of the clamp, to the distance from the clamp to the axle centers. If that makes any sense.

Yes i understand, thanks

 

[MUSTCLIME]

Plastic gunna crack…. Looks like a bike top tube rack carrier crack to me… hit a pot hole, get a cracked frame. Seen it a couple times.

 

[FrankS29]

Never, ever clamp ON a carbon frame.

Ever.

Even when I'm building up a new bike, I have cheap ,old rigid seat posts that I install on the bike to clamp to while I build.

 

[Jayem]

Yes perhaps that's the reason however it wasn't clamped strongly, amount of pressure would only be from the weight of the bike, or just a bit more, also the crack is only on one side. Can it be repaired? with carbo repair kit?

Carbon repair "kits" are a gimmick, but yes, it can be repaired. It requires sanding down to expose a good amount of bare carbon to actually do a structural repair, at least 3-4" in front and behind and more is better. Then get some CF at a local industrial supply shop. Do some searches, theres probably a composites shop somewhere near. I cut strips and run them in opposing helix patterns, at least 3-4 layers. Its fairly easy to over-build it, which is good. I use West system epoxy and hardener. The shop may have some no-stick tape to wrap, otherwise you can use some painters tape to squeeze the CF and resin together. After it cures, you have another big sanding job. None of these steps are super complicated, they are just tedious and messy. There are some good threads on this site about CF repair. Ive done it successfully 3x now. 2x was my enduro bike and one of those times was because a rake got caught in the rear triangle during trail work and snapped the seatstay. Obviously not a fault of the bike.