Tuesday, July 21, 2009

Easton Carbon Fork

Alexander sent me these photos that he took of a friends bike after some sort of unspecified incident the occurred during a race. I'm not sure what you do to break your steerer tube, but the Spinergy Rev-X wheel is fine. Still, I'd triple check that Rev-X before riding it again.


Anonymous said...

Dang, that sucks. Weird spot to break. Hard to tell, but looks like the guy was exceeding the recommended spacer stack. Is that a 1 inch fork?

Anonymous said...

Catastrophic failure happened racing mt tabor, loss of control sent me into a ditch. Interestingly it didnt fail on the climb (where I was using the bars for leverage), it failed on the start of the decent.

I had 45mm of spacers, Easton says max is 50mm in warranty. And it is a 1". Maybe the rating should be lower for 1" steerer, or maybe they need to beef up that tube. Either I consider myself at least somewhat lucky to come out with a sprain with a week in a sling and nothing broken.

Anonymous said...

I consider you lucky too! Glad to hear there was not a catastophic failure of your body as a result. Stack height be damned, you never want to see this happen on a fork... period. If they can't make a carbon steerer strong enough, they shouldn't make it at all. I used to think the 1 inch vs 1 1/8 argument was a bunch of hooey, but for carbon steerers it does seem to make sense. You are right, Easton doesn't specify a stack limit difference between the steerers on the warranty. I've seen that Alpha Q and perhaps Reynolds do.

It does beg the question... did you get a new fork out of the deal, and.... are you willing to ride it after this happened? Again, glad you're OK, mate!

Naugas said...

And check that front wheel regularly. You should read this, if you haven't already: http://pardo.net/bike/pic/fail-020/index.html

Much info on that site is very interesting read for everyone interested in engineering and strength of bicycle components. http://pardo.net/bike/pic/ The "broken bits" pages are of special interest of course.

Anonymous said...

Do you know what model and year this fork is? The reason I'm asking is that in 2009 Easton started using a different method of fastening the stem in place. Previously their forks used an expanding plug. In 09 they placed a high strength threaded expanding epoxy foam nearly the entire length of the steer tube. The key word is "nearly". Their web page says that their is 150 mm of threaded foam. I have a new Easton EC 90 SLX fork. I measured 150 mm down from the top and it looks like the high strength epoxy foam ends just about where your break occurred. I can't tell from the picture, but it looks like the top and bottom halves of the steer tubes are different internally. Did your fork come with the ITT (Internal Thread Technology) system?

Joshua said...

Anonymous, Easton doesn't use the ITT technology on 1" steerer tubes. For whatever reason, it's still the expanding plugs.

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