Tightening a Rivnut

At the end of the summer my Principia Rex Pro Summer bike developed a rattle. After a bit of investigation it was clear that it was the water bottle cage and no amount of tightening would help as the threaded hole into which it was fitted could clearly be seen moving in the frame. Needless to say I was not best pleased about this. As there was no obvious way to solve this. I found out the fitting was known as a “rivnut” but sill not much help as to how to tighten one. Another expensive tool sprang to mind, until today.

Reading uk.rec.cycling there was a thread that had the solution. (At the time of writing the solution has not yet made it into Google groups).

Get a long bolt that fits the rivnut and a nut for that bolt and a washer. Put the nut on the bolt and spin it up the bolt to the bolt head. Not tight. Then put on the washer and screw the whole thing into the rivnut. Now hold the bolt still with in my case and allen key and then “undo” the nut so that it is pushing down on the frame. This compresses the rivnut and then all is well. It certainly seems to have worked.

Very happy.

Tags:

Comments:

Chris, Excellent solution! Had you considered using LOCTITE (Henkel) product to replace or snug that pesky 'rivnut' fitting? (Old enough to have worked with 'true' metalsmiths, not many remain.) My 2006 'Trellis' cycle project (design) is almost finished, saves 25-33% in total vehicle mass. Optimized for 'crosswind' conditions.

Posted by William R. Walling on November 28, 2005 at 02:43 PM GMT #

Hello, I tried your bolt/nut system to install a new rivnut on my bike. Unfortunately the rivnut is turning in sync with the nut.... Any idea to avoid this? Regards Jeff

Posted by Jeff on June 09, 2007 at 01:07 AM BST #

I don't think you should use this technique to install rivnuts. The tool should install them correctly. It is only if once installed they can be tightened again using this technique.

Posted by Chris Gerhard on June 09, 2007 at 10:27 AM BST #

If you wanted to use this to set the rivnut you may want to put another larger size nut between the one on the bolt and the face of the rivnut. Hold this larger nut with a wrench to prevent it turning, hold the bolt from turning, and tighten the other nut.

Posted by guest on August 16, 2007 at 12:00 PM BST #

If you can fab a small bracket or metal strap, you can then turn the screw to install the rivnut much easier. The trick is to not allow the rivnut body to rotate while collapsing.
There are tools available for $40-70 USD from regional distributors.Some solution is available everywhere in the world.

Posted by Tom B on April 03, 2008 at 08:07 PM BST #

Post a Comment:
Comments are closed for this entry.
About

This is the old blog of Chris Gerhard. It has mostly moved to http://chrisgerhard.wordpress.com

Search

Archives
« April 2014
MonTueWedThuFriSatSun
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
    
       
Today