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Pitting inside of steerer

Old 06-22-23, 08:34 PM
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Pitting inside of steerer

Hello,

I was fortunate enough to get a brand new Surly Troll (mtb). I'm building it up, and before I went to install my star nut, I noticed what looks like some pitting about halfway down the inside of my steerer. I shoved some scotch brite down it to clean it up as best I could, but it's not going anywhere.

Wondering if this could be a problem down the road.

Thanks.

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Old 06-22-23, 09:09 PM
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Originally Posted by Shinkers
Hello,

I was fortunate enough to get a brand new Surly Troll (mtb). I'm building it up, and before I went to install my star nut, I noticed what looks like some pitting about halfway down the inside of my steerer. I shoved some scotch brite down it to clean it up as best I could, but it's not going anywhere.

Wondering if this could be a problem down the road.

Thanks.

looks like high quality DOM tubing to me... DOM = Drawn Over Mandrel... that's the good stuff, no seams... specified for Race Car Rollcages, Frames, etc... smear some grease in there and ride it.
you should be aware that forks transmit almost all high loading to the Crown Race... anything above that is only lending stability via shear/side/flex loading, and not much of that. really .

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Old 06-22-23, 09:29 PM
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Originally Posted by maddog34
looks like high quality DOM tubing to me... DOM = Drawn Over Mandrel... that's the good stuff, no seams... specified for Race Car Rollcages, Frames, etc... smear some grease in there and ride it.
you should be aware that forks transmit almost all high loading to the Crown Race... anything above that is only lending stability via shear/side/flex loading, and not much of that. really .
Here's a video of the Drawn Over Mandrel Process.. it works the grains of the material into a better alignment and work hardens it... and if you're seriously concerned about those minor marks in the interior surface, send your photos to Surly and see what they say...

Video refuses to load.. BikeForum has been having a series of annoying glitches lately... Search: "Drawn over mandrel video" and pick one to watch... i'd suspect what you're worried about is some built up grunge that broke loose off the mandrel during manufacture.

Last edited by maddog34; 06-22-23 at 09:34 PM.
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