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PostPosted: Thu Sep 13, 2012 10:43 am 
Old School Grand Master
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Joined: Tue Oct 19, 2010 9:55 am
Posts: 7058
Location: The land of Lea & Perrins
Quick question.

I know that the thread pitch on the RS and Fox rear shocks are different. Can I ream out the threads from my RS trunion and use it on a Fox shock? I'd ream it out so that the trunion slides over the Fox threads, and then I'd use a spare spring compression plate (one that screws on to the Fox threads) top and bottom to hold the trunion in place.

Just a thought - I think I've read somewhere that someone else was thinking about trying it but I'm not sure if anything came of it. It looks to be an easier solution than trying to find a trunion to fit a Fox shock!


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PostPosted: Thu Sep 13, 2012 10:59 am 
Retro Guru

Joined: Sat Apr 11, 2009 4:27 pm
Posts: 988
Location: Devon
I dont think so, I'm at work so not in front of the trunnions at the mo but I'm pretty sure the internal diameter of fox is big enough that to ream it out you wouldn't leave enough metal in the RS trunnion for it to be strong enough.

The RS trunnion is physically smaller, not just a smaller internal diameter.


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PostPosted: Thu Sep 13, 2012 11:37 am 
Old School Grand Master
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Location: The land of Lea & Perrins
amedias wrote:
I dont think so, I'm at work so not in front of the trunnions at the mo but I'm pretty sure the internal diameter of fox is big enough that to ream it out you wouldn't leave enough metal in the RS trunnion for it to be strong enough.

The RS trunnion is physically smaller, not just a smaller internal diameter.


Bugger :(

Thanks for replying though - at least I know now!


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PostPosted: Thu Sep 13, 2012 1:07 pm 
BoTM Winner
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Joined: Fri Dec 28, 2007 9:50 pm
Posts: 340
Location: Ontario, Canada
Barneyballbags wrote:
Quick question.

I know that the thread pitch on the RS and Fox rear shocks are different. Can I ream out the threads from my RS trunion and use it on a Fox shock? I'd ream it out so that the trunion slides over the Fox threads, and then I'd use a spare spring compression plate (one that screws on to the Fox threads) top and bottom to hold the trunion in place.

Just a thought - I think I've read somewhere that someone else was thinking about trying it but I'm not sure if anything came of it. It looks to be an easier solution than trying to find a trunion to fit a Fox shock!


I thought I read that someone had done it too. My main concern would be wrecking the one and only trunnion I have.

Wonder how many people are out there that would pay to have a small batch made for Fox shocks?


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PostPosted: Thu Sep 13, 2012 1:40 pm 
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Joined: Sat Apr 11, 2009 4:27 pm
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Location: Devon
I'll measure up and post a pic tonight just to make sure


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PostPosted: Fri Sep 14, 2012 4:59 pm 
Retro Guru

Joined: Sat Apr 11, 2009 4:27 pm
Posts: 988
Location: Devon
sorry no pics, but I did have a look last night and you might actually get a way with it!

the fox trunnion is bigger, but looks like there might be just enough metal to do what you're thinking, although would be easier to get a new trunnion made I think


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