Polyurethane Rod For Older Judys

[npn]

https://www.amazon.co.uk/Spring-Shock-A ... B008SA6SBY

It's interesting to see that 2 out of the 3 reviews were from people who used it to replace the original elastomers for RockShox Judy.

I've ordered one for myself regardless of the somewhat negative review and will update the board with my results... rebuilding a '96 Judy XC

Meawhiles, has anyone here used this rod successfully?

 

[npn]

Re:

I guess after some searching I found the answers I was looking for. Hardness is the key to the Polyurethane and it seems that what's out there is mostly too hard. I guess I'll have to experiment with cutting, drilling etc.

 

[Thias]

Won't be better than a set of cheap and easily obtainable springs

Drilling those PU-rods is a pain, I can tell you that.

 

[npn]

Won't be better than a set of cheap and easily obtainable springs

Drilling those PU-rods is a pain, I can tell you that.

Yes, it would probably be easier... my Zaskar's Judy has the Kronos springs so I kind of wanted to see how things will turn out with the PU rod.

I have to to cut about 10 pieces about 5cm each and yes drill a hole through. I like to get my hands dirty like that so I guess I'll find out.

 

[Kevhl]

These guys will mould to spec. it's all about the shore rating as you say. I think you want between 40 and 60a but most off the shelf is harder.
http://www.polyurethanemanufacturers.co.uk/index.html
I haven't used them as I made my own spring stacks but I got a quote; from memory it was a 2 week lead time and around £38 for enough to do 1 fork. That was moulded with a centre hole.
Note: I was looking for Manitous but it's the same story.

 

[danson67]

These guys both do 40 shore rod etc.:

http://www.par-group.co.uk/rubber-and-p ... t-and-rod/

And:

https://www.camthorne.co.uk/product/polyurethane-rod/

All the best,

 

[marc two tone]

Re:

Also, try not to over think drilling and cutting.

You are entitled to re design the stack, have a long elastomer, remove spacers etc...

 

[FluffyChicken]

Re: Re:

Also, try not to over think drilling and cutting.

You are entitled to re design the stack, have a long elastomer, remove spacers etc...

You are but the multi stack was to reduce bulging you get in a long elastomer.
Also that's another reason they moved to MCU (foam) elastomer for the better setups.

 

[npn]

Re:

Original MCUs:

It turn out to be about 1 hour job. I decided to cut 6 pieces instead of the 5 and didn't use the original plastic one on the very top. I did that in hopes of smoother action.

It was hard. So I drilled about 12 tiny holes in each one of them and ended up with this:

I only used it in one of the legs. Not so bad, but not as good as I wanted it. From the picture bellow you can see the grease line - I was able to push down with bare hands only about 2 inches.

I seem to recall somewhere that the "hardness" of this rod was D80 and that the ideal ones for the MCU replacement should be around D40. The little holes I drilled helped a lot, but only riding the bike would tell the final verdict.