Haven't been able to ride since June 24th and when I went out to grab my Ripmo V2 today the front wheel just flopped around. I was like "WTH!" Looked at the stem and saw it was cracked at both stem bolts. This stem was properly torqued to 7-9nm and has been on the bike since it was built in Sept. 2022. Anyone ever experienced something like this?
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Industry Nine Stem Cracked in 2 places
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Chris442
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Looks like your stems are showing a lot more exposed thread than the OP… but I guess that could just be running change with hardware length.
To save weight, that bolt section is very thin too and 7075 alloy is harder but more brittle than 6061, for example. I guess we have to be a bit careful with the torque when it comes to I9s and similar stems. If you look at the ENVE alloy stem and others like RaceFace or Chromag, there is usually a lot more material in that area where it clamps around the steer tube.
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It is small though. Changes in low values always equal a big jump in percentage but the overall jump in value is nill. If the cause of failure here was being over torqued hopefully it was more than 20 inch pounds.
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Had a Turbine face plate break in half at the start of a ride. They have had their issues.
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My A35 stem was marked 7-9NM as well, and I ended up breaking the bolts. Contacted i9 (after seeing the online manual saying 5-6NM) and they said it was a misprint and 5-6NM is the correct value. Sent me new bolts. Seems like OP way over torqued the bolts, IMO.
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Not a misprint, seems they just changed the torque specs after people were having issues.
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Wtf, they can't figure out what torque their bolts need? This is undergrad engineering stuff.
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Weird, David one of their techs said "The torque we recommend is 5-6Nm. We have updated the lasering on our stems but the older ones will still say 7-9Nm. " in the email I had going with them. Nothing about updating their torque specs.
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If everything used to say 7-9 Nm and now everything says something else, I wouldn't call that a "misprint". That's just them changing the torque spec from 7-9 to 5-6 Nm.
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But the difference between those two torque specs is pretty good. You don't think their engineers knew the correct torque specs based on the bolts they were using? Unless they changed the bolts as well, which I don't think they did. 8NM is enough to snap the bolts, I know from experience lol.
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Garbage.
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How can the stem be tightened if there are threads on both sides? That's not nuancing, that's basic understanding of fastening things.
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7,189 Posts
8 Nm is spec'd on plenty of stems (RF Affect R for example). They didn't accidently print the same torque value in the manual that they lasered into the stems.
Brad signing an email " B Rad" is a misprint. Brad getting a "B-Rad" license plate and tattoo is a lifestyle choice.
They tattooed 7-9 Nm on the stem.
^^This is a misprint.
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76 Posts
That is just lovely news to hear. If that is the case with the wrong torque then they need to remove the wrong guide from their website and recall or get a notice out to all vendor with stems that have 7-9nm stenciled on them. Probably cheaper to just replace the once that fail if/when people file a claim.
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Interesting. Do you happen to still have that email and would you forward a copy to me?
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Don't forget this is a 31.8 vice 35mm so maybe the tq specs are different. Thinking I should upgrade my handlebar to a 35mm.
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Why? What do you think that will gain?
Oh and the steerer tube is still the same diameter.
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