Ultimate Bike Thread....

[Tim K]

Leaky, that is terrible! Good for you for getting back on the horse, so to speak.

Tim K

[stuartj]

Guys- what type of glue/adhesive can I use on a plastic fantastic carbon frame?

Want to re-attach an errant vinyl/plastic makers badge to the head tube - but Im leary of using a glue that might in any way weaken the material, especially there...tried a benign 'craft' type glue, didn't work.

Super glue or araldite...any reason not use these on a plastic/carbon frame?

Happy to leave it off also.

Thx Stuart

[herr_oberst]

Originally Posted by stuartj

Guys- what type of glue/adhesive can I use on a plastic fantastic carbon frame? .....

Thx Stuart

I'd contact a pro, here's the link to a company in Portland that repairs CF frames. They should know.

| Ruckus Composites

[CurtEgerer]

Originally Posted by Tim K

Well you might be interested in a couple more data points then.

I don't have access to the head tube at the moment but I have a few pics.

1. The tearout from the bottom of the top tube is not still attached to the lug. The bottom of the top tube may very well have been the first thing to hit the ground.

2. The innermost layer(s) of carbon are still attached to the top lug save for a small section at the top.

Tim K

Thanks for the additional pics Tim. At least I now know what the inner male stub part of the lug looks like. Interesting that it is 'V' shaped. Seems odd that there appears to be no glue residue whatsoever where the piece of the top tube came off - just shiny alloy.

This vid has been going viral and shows another carbon failure - the fork blades shear off at some point during this crash .... looks like maybe that piece of scrap aluminum he hit got caught in the spokes and then flung around and sliced right through the forks.

[look 171]

I hate seeing stuff like that. It scares the hell out of me knowing carbon can fail.

I wonder what cause the front wheel to lock up like that? The bent piece of steel could have been picked up by the wheel then thrown into the spoke causing first breakage to the fork? There's no way a rider can go over the bars like that unless something got into the spokes. Also, it it looked like the bike landed on the front wheel causing the whole thing to explode. the attached wheel to the fork blade got separated as soon as it hit the ground. the second impact might have finally broken it off completely. Notice the damage the steel bar make to the down tube.

[look 171]

going back to see the vid again at :30, the wheel broke before the steel pipe was picked up and thrown into the frame.

[look 171]

Originally Posted by stuartj

Guys- what type of glue/adhesive can I use on a plastic fantastic carbon frame?

Want to re-attach an errant vinyl/plastic makers badge to the head tube - but Im leary of using a glue that might in any way weaken the material, especially there...tried a benign 'craft' type glue, didn't work.

Super glue or araldite...any reason not use these on a plastic/carbon frame?

Happy to leave it off also.

Thx Stuart

Double sided tape. That's what was holding my headbedge on my Trek OCLV 550 frame. That sucker was on tight.

[jyl]

[EDITED after frame by frame viewing - Chrome has an extension for this)

Stop the video at the right instant and you can clearly see a black bar shaped thing about 2 feet long, positioned horizontally, right behind the fork blades about midway up from the hub. Can't tell if it is in the spokes, or got picked up by the tire tread. I'm guessing the latter because later on you see the wheel and the spokes are intact. The bar changes position from frame to frame, maybe it gets jammed in the fork crown and the end hits the downtube in the process. When the bike goes airborne, the front wheel looks still attached. I'm guessing the fork blades were broken by the impact with the ground. Anyway, seems whatever material the frame was, that rider was going to go airborne, and when the bike hit the ground, there'd be big damage. A steel frame would likely have been toasted too, maybe not broken clean through but destroyed nonetheless.

[jyl]

Here are some frames

Crash1 just before the bar gets picked up


Crash2 the bar is behind the fork crown, it moves around in a few different positions back there and the wheel starts to deform


Crash3 the rider is starting to lift off the sadle and pitch forward, wheel is deformed, bar still behind the fork


Crash4 the rider is going over the bars now, rear wheel far off the ground, note front wheel and fork still on the bike and bar still visible behind the fork


Crash5 bike is high in the air, you can see front wheel still attached


Later you see the bike land pointing straight down, hitting with the leading edge of the front wheel.

[CurtEgerer]

Here's a couple of more. The first one shows the piece of metal on the ground, angled up toward the bike - easy to see how it could get into the spokes.


This second one appears to show the metal object in the spokes:


This shows the blades sheared off even with the rim:


Almost looks like a windshield wiper blade Not much of a piece of metal to cause such a catastrophic crash:


Bottom line: this is one of the risks of riding fast in a tight group. You are essentially riding blind and relying completely on the leader to warn of road conditions. I wonder how the leader of the group missed it and failed to warn everybody?

[jyl]

You're right Curt. My eyes are crummy.

That looks like only about a third or a half of the spokes cut. Seemed like the front wheel rolled more than that, but I'm not sure. Maybe it wasn't "rolling".

[mikeferg75]

New race rig.

[greglepore]

Something in the spokes is always bad, whether the fork breaks or not. The way that bike flipped, it appears the rider was ejected by the wheel locking, and the fork broke subsequent, either due to the bar impacting it (likely, given the shear) or the ground. Steel fork would have caused same crash. Rider was lucky, I've had a number of cases (never actually sued anyone, just folks that came in) with broken forks where there were major helicopter ride type facial injuries from riders hitting the ground. I try not to think about it too much.

I was chewing the fat with an ex rider from our group on the weekend who is ex because of a front wheel related crash of which he knows not the cause that broke his wrist, radius and shoulder. Permanent deficit in wrist. Another current rider, a strong boy, 40, who's never been down hard could be seen to wince and shy away each time we discussed our various hospital visits.

[Racerbvd]

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Bond in retirement enjoying the humble Raleigh DL1.

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anyone have or know of?

[herr_oberst]

My commuter bike weighs 43 pounds wet.

Forty three pounds.

No wonder I get tired going home at night....