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Cracked Thomson Stem (Again)

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Cracked Thomson Stem (Again)

Old 10-16-09, 06:43 PM
  #1  
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Cracked Thomson Stem (Again)

Hi all

I bought and installed this stem 2 years ago and the bike is rarely used. The bike is only for commuter ride for less than 30 times ever since.

Last week, I found huge crack on the stem. Mailed thomson, but no reply.

I lived overseas, the nearest distributor is in Singapore, but no email address (have someone over there to help me out with the claim, but still hoping for the result)

Today, I search 'cracked thomson stem', and surprised with the result. How can someone claims the strongest built in the world with such poor product and service?

Been pissed off with this company so far.
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Old 10-16-09, 06:46 PM
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did you follow the specific torque recommendations right there?
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Old 10-16-09, 06:47 PM
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Wow...I wonder...do you use a torque wrench with your stem cap bolts, b/c I've never had an issue with that. I wonder if your bar is an abnormally (mistake) large diameter...like 32mm.
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Old 10-16-09, 06:58 PM
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Hi

Thanks for replying craigcraigcraig, chelboed.

The one who installed the stem was a bike shop and they have been installing and building up all kind of bikes, I know this guy is very professional.
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Old 10-16-09, 07:06 PM
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This is the shot from another angle, so it is clear that the bar is not too big
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Old 10-16-09, 07:24 PM
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.2mm is not a visible difference, but with precision componentry like a Thomson stem...I think it "could" matter.

This is a long shot though.
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Old 10-16-09, 07:28 PM
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Yesterday a new stem on a new bike cracked there when I was tightening it. Hand tight. Just a loud "pop" and then it was cracked. How far is this bike store in Singapore?
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Old 10-16-09, 07:28 PM
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It would need to be a smaller diameter to put a crack in the middle of the faceplate like that. If it were larger, the faceplate wouldn't fit on properly.
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Old 10-16-09, 07:45 PM
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Originally Posted by mzeffex View Post
Yesterday a new stem on a new bike cracked there when I was tightening it. Hand tight. Just a loud "pop" and then it was cracked. How far is this bike store in Singapore?
Hi mzeffex,

It's about 2 hours flight.

Cappa Trading Pte. Ltd.
85 Kaki Bukit Avenue 1
Shun Li Industrial Park
Singapore 417955
656-841-5151 - phone
646-842-5133 - fax

I absolutely sure there was no 'pop' sound when the guy installed it, I was there. And it's been 2 years since the installation

Thanks for the information.
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Old 10-16-09, 07:58 PM
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I'll sell ya a 90mm x 6' Easton and ship to to the S'pore.
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Old 10-16-09, 08:43 PM
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It's not a crappy stem - that'll happen to any stem if you overtighten the faceplate pinchbolts too much. And no, it doesn't mean it's going to happen right away either.
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Old 10-16-09, 08:54 PM
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if you don't want the stem anymore ill take it.
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Old 10-16-09, 10:36 PM
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Someone overtightened the faceplate.
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Old 10-16-09, 11:58 PM
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Where are you located? Thailand? Burma? Indonesia?
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Old 10-17-09, 06:21 AM
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I had this happen and was simply told by Thomson it was over tightened, plain an simple.
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Old 10-17-09, 07:58 AM
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Originally Posted by Rosso Corsa View Post
It would need to be a smaller diameter to put a crack in the middle of the faceplate like that. If it were larger, the faceplate wouldn't fit on properly.
If it (bar) were too large and you over tighten it...it could in theory crack in the middle b/c it's trying to pull the thing apart. If the bar were too small...the face plate would just bottom out on the face of the stem (as the bar would just wobble and spin in the "too large" hole) and the gorilla would have stripped out the screw holes instead of cracking the faceplate.
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Old 10-17-09, 09:20 AM
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Thomson makes very decent products.(err... I also lived 30 minutes from their factory and rode thier bike trail...) But I was able to see their prodcuts first hand, I find it hard that they just "cracked" unless it was a faulty object or user error.
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Old 10-17-09, 12:49 PM
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Originally Posted by stanamas View Post
This is the shot from another angle, so it is clear that the bar is not too big


+1 Ed, Dan, Scrub. Overtightened.

Look how close the faceplate is to the stem body. What is the gap I'm used to seeing there with (Thomson) stems, 2-3mm average? It's not there, in the OP's photo. Waaay tight.

I am assuming that the bar is the correct size, so the only way to close that gap is to overtighten the faceplate.

Faceplate's had its back broken over the clamping area of the bar.
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Last edited by kenhill3; 10-17-09 at 12:57 PM.
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Old 10-17-09, 01:06 PM
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I dunno...Ken...as much as I like to be right, my Thomson bottoms out like that on my Easton EA70 OS bar when torque'd with a torque wrench.
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Old 10-17-09, 01:12 PM
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touch it up with some black paint and E bay it
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Old 10-17-09, 01:33 PM
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Doh! Nevermind...I just went and looked at mine. I've got about 1mm of space.
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Old 10-17-09, 01:58 PM
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My stem installed w/ torque wrench:

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Old 10-17-09, 02:06 PM
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Also could happen if one bolt was tightened all the way instead of bringing bolts up to torque slowly, in a crisscrossing fashion. Mechanics 101. Don't blame Thomson too many parts out there giving great service to too many people.
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