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Dented Down Tube

913 Views 6 Replies 5 Participants Last post by SinglePivot, Jul 30, 2004

DrLeah

Discussion Starter · Jul 29, 2004

sob!!

I was cleaning my baby blur tonight and noticed that the down tube has a DENT in it! It's on the left side, just at the bottom of the "T" of santacruz.

The edges and deepest part of the dent are smooth and the ano finish seems ok.

Should I be worried or just continue to cry??

Leah.

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Blue Shorts

· #2 · Jul 29, 2004 (Edited)

DrLeah said:
sob!!

I was cleaning my baby blur tonight and noticed that the down tube has a DENT in it! It's on the left side, just at the bottom of the "T" of santacruz.

The edges and deepest part of the dent are smooth and the ano finish seems ok.

Should I be worried or just continue to cry??

Leah.

I'm sure that others here will chime in, but as far as I know, you should be OK. The down tube sees mostly extension (tensile?)forces (as opposed to compression) and some rotational (twisting) forces. As long as the ding isn't very large, you should be OK.

I remember seeing a bike once that had a cable in place of a down tube. That was a big indicator that the down tube sees mostly extension (tensile) forces.

I would be a good idea to have the LBS take a quick look at the bike just to be safe.

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glenzx

· #3 · Jul 29, 2004

DrLeah said:
sob!!

I was cleaning my baby blur tonight and noticed that the down tube has a DENT in it! It's on the left side, just at the bottom of the "T" of santacruz.

The edges and deepest part of the dent are smooth and the ano finish seems ok.

Should I be worried or just continue to cry??

Leah.

99.9% chance it's fine. My downtube used to have a NASTY dent from a craggy sharp rock that my front tire spit up at it on a fast descent..... it was a sharp-edge evil looking dent that looked as though it almost punched a hole through the tube! It ended up fine.... until my front triangle broke at the BB/Set tube junction. (break was totally 100% unrelated)

That new front end is just about as beat up already.... oh well!

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DrLeah

Discussion Starter · #4 · Jul 29, 2004

Thanx!

Thanks for your advice - I'll find some time to take her in for a check-up.

I think that bike is called a "Slingshot", with the wire instead of a downtube.

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CraigH

· #5 · Jul 29, 2004

If you are concerened, take some pics and email them to Scott @ SC.

From what you described, it sounds fine to me. Keep an eye on it though.

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SinglePivot

· #6 · Jul 30, 2004

my friend has done the same with his blur also from crashing and dropping the downtube onto a rock with him still on it.

my 5yr old bullit (RIP) had a dent in the top tube that never affected the bike's integrity.

-Sp

DrLeah said:
sob!!

I was cleaning my baby blur tonight and noticed that the down tube has a DENT in it! It's on the left side, just at the bottom of the "T" of santacruz.

The edges and deepest part of the dent are smooth and the ano finish seems ok.

Should I be worried or just continue to cry??

Leah.

Save

SinglePivot

· #7 · Jul 30, 2004

Wg, can you expand? I think it can be the opposite (compression force) as well. biker riding downhill standing on the pedals runs into a rock. doesn't the down tube see compression and the top tube extension in this situation?

-Sp

Blue Shorts said:
I'm sure that others here will chime in, but as far as I know, you should be OK. The down tube sees mostly extension (tensile?)forces (as opposed to compression) and some rotational (twisting) forces. As long as the ding isn't very large, you should be OK.

I remember seeing a bike once that had a cable in place of a down tube. That was a big indicator that the down tube sees mostly extension (tensile) forces.

I would be a good idea to have the LBS take a quick look at the bike just to be safe.

Save

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