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Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

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Old 01-02-14, 11:38 AM   #1
miamijim
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RIVNUTS Alu Steel SS smooth Serrated?

I have 2 aluminum frames with loose rivnuts that need replacing.

Which will give best long term grip and strength? I'm thinking serrated SS but I'd like to hear what you guys think.

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Old 01-02-14, 12:19 PM   #2
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There are different diameter RivNuts in use on bikes. So whatever material make sure you have the correct fitting ones. I have augmented the fitting with epoxy a number of times. I would practice (on sheet or tubing with the same wall thickness as the bike has) before doing the actual replacement. Get a handful of each material and see which gives you (using the tool you will be using) the best fit and tightness. They aren't very expensive compared to what they do. If all else is equal I'd prefer SS as the material but I suspect you'll find a difference in the tightening between SS and Al. Andy.
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Old 01-02-14, 12:35 PM   #3
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Originally Posted by Andrew R Stewart View Post
There are different diameter RivNuts in use on bikes. So whatever material make sure you have the correct fitting ones. I have augmented the fitting with epoxy a number of times. I would practice (on sheet or tubing with the same wall thickness as the bike has) before doing the actual replacement. Get a handful of each material and see which gives you (using the tool you will be using) the best fit and tightness. They aren't very expensive compared to what they do. If all else is equal I'd prefer SS as the material but I suspect you'll find a difference in the tightening between SS and Al. Andy.
Thanks. So are you saying there're different diameters for a given thread size? M5 X 0.8 are available in different O.D's?
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Old 01-02-14, 01:41 PM   #4
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I have 2 aluminum frames with loose rivnuts that need replacing.

If they are already in place, perhaps you just need to force them to expand More?
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Old 01-02-14, 02:21 PM   #5
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If they are already in place, perhaps you just need to force them to expand More?
That will depend on if they'll drop out through the BB for removal!!! If they wont then I'll just re-expand them...
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Old 01-02-14, 02:48 PM   #6
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vent holes in the bb are probably pretty small, so you're unlikely to have success getting them out that way
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Old 01-02-14, 04:28 PM   #7
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vent holes in the bb are probably pretty small, so you're unlikely to have success getting them out that way
One frame is welded the other is bonded... maybe i'll get lucky with the bonded frame
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Old 01-02-14, 08:08 PM   #8
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Thanks. So are you saying there're different diameters for a given thread size? M5 X 0.8 are available in different O.D's?
Yes. Andy.
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Old 01-02-14, 09:27 PM   #9
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They are expanded, at the most basic, by putting a flat washer across the flange on the outside ,
and a greased bolt in them

same 5x.8 . and tightening the bolt

others have used a QR from a Seatpost, or hub put thru a tube

Spare axle with the cone and locknuts , perhaps ..
and just closing the QR to Pull the Riv nut thread against the outside flange..
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