Rock Shox Quadra rebuild CHEAP - done

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Jul 25, 2016
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I have a 94 trek 930 with rock shox quadra 10 forks, theyre dead so its been sitting for some time. My buddys teen son was looking for a trail rider to keep at their cabin. Guess what pops up, '94 trek 930. Exact match to my bike with a bit smaller frame. It was meant to be. The rock shox on the second bike have a little life but not much.
 
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Jul 25, 2016
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After watching videos on how to rebuild rock shox, the elastomers are what goes bad, other than corrosion and grit.
If youre not familiar, elastomers are 3/4" urethane bar stock. After pulling one out, Its a purple floppy solid rod 6" long. Thats for quadra rock shox, judy rock shox have stacks of shorter elastomers so you can tune the ride ( different design with tubular elastomers that slide over a rod and remove as a pack). Replacement elastomers are $55. WHOA.

I considered rigging some springs. But there no dampening, maybe a spring and rubber combo......

I started learning about PUR polyurethane specifications.

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Found this handy little chart. Shore A spec (middle) is the one we'll look at. Shore A is the closest thing to durometer I can find for this material.
 
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Jul 25, 2016
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Found this on amazon. $11 for 48" of 3/4 diameter shipped to my door.
Screenshot_20190708-203033_Chrome.jpg


Amazon didnt know Shore A spec on the bar.
I looked up the manufacturer, small parts inc, and by checking their manufactuer number againt some Shote A data they had. The Shore A is in the manufacturer number.
Screenshot_20190708-203153_Chrome.jpg
 
Jul 25, 2016
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Sorry about going absent. Bought a couple trucks at an asset auction, took a while to get them picked up.

Original elastomer is purple, New is yellow. New is a little larger diameter but fits in the tube and end caps fine. Seems to be the same durometer from finger nail test and finger bend test - not real scientific.
Original was 6 1/16, cut the new material to 6 1/4, just cause it seemed like a good idea.
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I need to make a long 5mm hex extension before i can tear these down.
Interested to see if adding length and new elastomer makes these ride well, i can always cut a 6 1/2 or 6 3/4 piece. Have plenty of material.

I can practice on friends kids bike fork rebuild since hes about 130 lbs, see how stiff they are and adjust for my fork rebuild to carry more....um...mass.
 
Jul 25, 2016
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20190811_164750.jpg

Got a chance to finish this up today and ride.
New PUR rod at 6 1/4 feels great. Took that inch or so of deadness out of the top of travel that rock shox get.
Ill likely go 6 1/2 on mine for a little more stiffness.

The bike itself is great, looks like all original parts, everything cleaned up and tuned up well.
Its a bit small for me, but brought back some memories.

Need to pull my trek 930 off the shelf and go thru it. Shox are figured out, the rest is wear.