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BIG dent in frame. Are today's aluminum frames stupid light?(9 posts)

BIG dent in frame. Are today's aluminum frames stupid light?Eug
Jun 6, 2003 10:41 AM
They may be underestimating the frame weight, but Trek claims my aluminum 54 cm frame weight is 2.85 lb. It comes with their OCLV carbon fork.

To be quite honest it doesn't seem significantly stiffer (or floppier) than my 4 lb CroMoly double-butted mountain frame. My friends' 4 lb aluminum mountain frames feel like tanks however. I can't ride them at all because they're so bone-jarring.

However, I'm thinking to get that "feel" and the lightness in the road frames, Trek has started to get into the territory where strength could be considered compromised. My friend's Trek (same frame) was leaning on the edge of a rectangular post and the top tube slid down the post because the rocks under the wheel were not stable.

There is now quite a large dent in the top tube where the top tube touched the post. The overall dent is probably about 1 inch. I'm thinking an average steel or Ti bike would likely not have had the same dent, and neither would the old school 3.5 lb aluminum frames.

Or do you think most road frames would have been dented similarly?
Most Aluminum frames under 3 pounds will dent.......MR_GRUMPY
Jun 6, 2003 10:52 AM
along with steel frames under 4 pounds. They are very strong frames, but the wall thickness is getting so thin, that the tubes will dent a lot easier than "old school" bikes.
What about Ti frames .. ?Steve Young
Jun 6, 2003 11:29 AM
I understand that strength and "dentability" might be considered different properties of a frame. I'm curious as to whether lightweight aluminium frames are particularly prone to denting due to some intrinsic property of the material.

Put another way. Does anyone have any opinion on the relative weights of aluminium, steel and Ti when dentability becomes a real liability ?

Is there any basis in this discussion that could contribute (?!) to justifying spending 2,500 K on a custom seven Ti frame ??

Steve
No matter what the material is, if it is very thin......MR_GRUMPY
Jun 6, 2003 11:54 AM
It will dent.
A $2500 Seven Ti frame will be as light as the lightest steel frames, but will be more dent resistant. It won't be any stronger in a crash, but it will take a wack from your kid's baseball bat better.
My riding partner was nailed by carSnowBlind
Jun 6, 2003 12:50 PM
about 8 weeks ago, broken arm, 2 teeth (and one more still might go) destroyed the front wheel, damaged fork, handlebars may be a loss.

But the Seven frame is still straight as an arrow after surviving it's third crash, and having as many miles on it as some cars.

FWIW, it is a frame under serial 1000, so it is pre gee-I-gotta-have-one-too Seven construction.
crashes are funny in some waysMR_GRUMPY
Jun 6, 2003 1:04 PM
I was in a 35 MPH pack crash and didn't put a scratch on my TCR frame, but I've seen people mess up a frame by falling over at 10 MPH.
agreednazgul
Jun 6, 2003 3:12 PM
It all depends on how you hit the pavement. I recently purchased a set of tubular wheels from a teammate and the rear tire rolled of the rim in bumpy corner at the Collegiate Easterns crit (I guess the shop that had glued them didn't do a great job). I went down at somewhere in between 20-25 mph but my bike frame never really hit the ground. The only skuffing was on the pedal, saddle and most unfortunately my behind :)
The Seven will probably be less susceptible to dings.djg
Jun 7, 2003 8:53 AM
Not impervious, but significantly better I'd guess. Of course super thin-walled tubing in any material can take a hit--I've seen it with steel.
re: BIG dent in frame. Are today's aluminum frames stupid light?morency
Jun 6, 2003 11:09 PM
a few weeks ago, riding my C40, I had a frontal hit by a car at 40Km/Hr, fork was cracked, shifters broken, my wheel (Cosmic Carbone) was still straight, and my frame was also OK. there's always something that takes the blow, in my case the fork cracked, saving my frame and wheel. My knee took the impact saving my head (not wearing a helmet, stupid me).
In general carbon cracks, aluminium/titanium bends, steel bends or breaks at the joints. no mather what material your frame is made of. Bikes are only made to ride you know.