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  1. #1
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    RockShox XC28 spring upgrade

    I have the Guardian with the stock XC28 80mm fork. I came across a RockShox manual that recommends for my weight (195-200lbs) I should be running a firm spring as opposed to the factory medium spring.

    http://cdn.sram.com/cdn/farfuture/w-...4149_rev_c.pdf

    I found the spring kit at several outlets for about $23, not too bad.

    Here are my questions:

    1. Is the spring swap worth doing?

    2. How difficult is this spring swap? Has anyone here had one of these apart?

    3. Most of the firm springs I have found are 100mm. Will a 100mm spring work in my fork?

    The fork is not doing a bad job for my type of riding. Mostly single track with lots of roots and an occasional short drop. I have the preload maxed out. If I can improve the performance for 23 bucks I'm all for it. What do you guys think?

  2. #2
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    I bought firm red spring(80mm for my Guardian) but haven't got it yet.
    Once I get it I will let you know.
    Anyway Im 205 lbs.(225 was in April) I feel stock xc28 is little light. so $23 for firm spring..why not?

  3. #3
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    Quote Originally Posted by mark729 View Post
    I bought firm red spring(80mm for my Guardian) but haven't got it yet.
    Once I get it I will let you know.
    Anyway Im 205 lbs.(225 was in April) I feel stock xc28 is little light. so $23 for firm spring..why not?
    Where did you buy this? I'm having trouble finding it. I'm having a similar issue but I'm at 220lbs.

  4. #4
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    Quote Originally Posted by hrbib21 View Post
    Where did you buy this? I'm having trouble finding it. I'm having a similar issue but I'm at 220lbs.
    RockShox XC28 Spring Internals Left 29 80 Firm Red - AEBike.com

  5. #5
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    Quote Originally Posted by mark729 View Post
    I bought firm red spring(80mm for my Guardian) but haven't got it yet.
    Once I get it I will let you know.
    Anyway Im 205 lbs.(225 was in April) I feel stock xc28 is little light. so $23 for firm spring..why not?
    I think it could be well worth the money. The part that concerns mi is tearing down the shock. I have never had one of these apart. Part of my brain is saying leave well enough alone. I am really eager to see how your tear down and reassembly goes. Best of luck!

  6. #6
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    Quote Originally Posted by TheDocTx View Post
    E

    I think it could be well worth the money. The part that concerns mi is tearing down the shock. I have never had one of these apart. Part of my brain is saying leave well enough alone. I am really eager to see how your tear down and reassembly goes. Best of luck!
    https://www.youtube.com/watch?v=aa-b...e_gdata_player

    Well..it does not look hard.

  7. #7
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    That's as easy as it gets.

  8. #8
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    I took apart my xc28 last summer. The spring comes right out. It's way easier than servicing an air fork.
    Nathan

  9. #9
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    Quote Originally Posted by mark729 View Post
    Wow, yeah. Not much to it. Time to order parts!

  10. #10
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    RockShox XC28 spring upgrade

    Does anybody have a link for RockShox XC28 Spring Internals Left 29 80 X-Firm Blue? I'm only finding RockShox XC28 Spring Internals Left 29 80 Firm Red.

  11. #11
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    Quote Originally Posted by KrazyKreitzer View Post
    Does anybody have a link for RockShox XC28 Spring Internals Left 29 80 X-Firm Blue? I'm only finding RockShox XC28 Spring Internals Left 29 80 Firm Red.
    I dont think you can find it.
    I've searched almost week but no luck..

  12. #12
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    I got UPS today. Firm Spring~!

    RockShox XC28 spring upgrade-20130620_184828_zps0d5211fa.jpg
    First unscrew top knob which has preload adjustment.
    after take it out, push down handle bar and take out top spring part.

    and take bottom nut(A) with allen wrench.
    RockShox XC28 spring upgrade-20130620_201752_zpsec27fac3.jpg
    RockShox XC28 spring upgrade-20130620_202334_zpsd76aeac4.jpg

    Bottom part(B) won't come out unless you hammer it(C) out.
    RockShox XC28 spring upgrade-20130620_202306_zpsdbedc851.jpg

    Put some grease on new bottom part and put it back to the shock.
    Put some grease on new top spring part and put it back to the shock.
    It will push down bottom part so you can screw the bottom nut which is A in picture
    and tight the preload adjustment knob.
    that's it.
    It would take 20minutes.

    and for someone like me.
    Here is the picture shows how preload work.
    RockShox XC28 spring upgrade-20130620_202847_zps041ad0a6.jpg

  13. #13
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    Dude, awesome write up. Thanks, I'm ordering the replacement right now.

  14. #14
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    Same here, nice write up! Had to throw some rep your way for that!

  15. #15
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    Quote Originally Posted by TheDocTx View Post
    Same here, nice write up! Had to throw some rep your way for that!
    Yep... I just gave rep to everyone here that I could. Looks like the rest of you I have given rep to before and it won't let me give you more till I give out more to others.

  16. #16
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    I'm not a bike mechanic or an expert at working on forks, but I'm betting you can damage your bike by hammering on the fork while it's still attached to the bike. Especially while it's laying upside down on the garage floor. I would take the fork off the bike and work on it independently.
    Nathan

  17. #17
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    Quote Originally Posted by Barheet View Post
    I'm not a bike mechanic or an expert at working on forks, but I'm betting you can damage your bike by hammering on the fork while it's still attached to the bike. Especially while it's laying upside down on the garage floor. I would take the fork off the bike and work on it independently.
    Well...totally understand what your saying but once you see what I mean, it does not need real hammering, it just need lightly hammering to take out bottom spring part.

  18. #18
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    Was it worth it?

  19. #19
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    Yes. Absolutely.

    Side note, there was hardly any grease on the stock spring. No wonder it made so much noise.

  20. #20
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    Quote Originally Posted by hrbib21 View Post
    Yes. Absolutely.

    Side note, there was hardly any grease on the stock spring. No wonder it made so much noise.
    I need to get off of my lazy rump and do this. Between family, work, and riding there is not much time left! I was thinking about this while riding this morning when I bottomed out the forks about 10 times.

  21. #21
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    Anyone know if it is possible to increase the travel to 100mm?

  22. #22
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    I would like to know that as well. I think I saw a forum post about adding spacer(s) to make 100mm.

    I'll be ordering mine as well, I think.

  23. #23
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    I was looking at the parts diagram for this shock and the only parts that are specified as being different between 80/100mm are the parts included in the spring kit. I may very well may be missing something here, but it looks like installing the 100mm spring kit may yield a 100mm fork. Admittedly I found it difficult to decipher the parts diagram/list, so I could be completely off base with this. I need to get off of my bum and just give it a shot.

    Here is a link to the parts diagram I was referring to:

    http://cdn.sram.com/cdn/farfuture/QX..._spc_rev_c.pdf

    The diagram and parts list are on pages 9 and 10. Take a look and see what you think.

  24. #24
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    I think you might be right! Tougher spring and more travel= good to me! 100mm Spring Spacer Kit..

  25. #25
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    So, would it be safe to assume that if you were to get the 80mm spring kit for an XC28 that was originally 100mm, it would reduce the travel (and, more importantly, the A2C distance?)

    This is for an older bike, so I'd like to keep the A2C around 450, and the XC28 is 471, probably do-able, but under 450 would be better (running a Surly Instigator fork at 445 and its perfect right now)

  26. #26
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    I'm not 100% sure on that, but based on the part list there, it seems to make sense. For example, this site has the spring kit with a "100mm travel" kit for 29":

    Universal Cycles -- Rock Shox XC28 Spring Kits

  27. #27
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    Did anyone try a 100mm spring in an 80mm fork? Results?
    Thanks.

  28. #28
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    What kind of grease do you use? And do you just smear it all over the springs? Im going to put an xtra firm in my xc28 tomorrow.

    i took my spring out and it came off easy without removing to bottom piece. I didn't swap springs though because I don't have any grease. The stock spring was covered in grease. Looks like the stock spring on my bike is a dark blue color. Or maybe like a grey. Definetly not light blue like the extra form one I bought. But I can't really tell a difference visually by looking at the spring thickness. Figured it would be a significant difference but I don't see it.

    When we talk about the color we are talking about the plastic piece at the top of the spring right?

    So does that bottom piece make a difference. Would be really easy to just remove the spring and not mess with the bottom.
    Last edited by DaveG99; 01-24-2014 at 10:38 PM.

  29. #29
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    Ok I figured out the sping color thing. The color is painted onto the spring. But just a little bit at the bottom of it. Still haven't replaced mine though because I don't know what grease to use.

  30. #30
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    I weigh about 210 and I just ordered a guardian, should I go ahead and order the firm spring?

  31. #31
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    I want to make sure I've got this right. The SRAM diagram makes it look like there's two springs on the left and the pts list indicates spring/spacer and a spring shaft kit. SO does the spring shaft kit have a smaller spring or is it just a crappy diagram? Also which spring set tends to be light in grease? (cause my fork started sounding like a pogo stick.)

  32. #32
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    Hi. Did anyone tried to increase or decrease the spring size on this fork?

    I bought this same fork with the 100mm travel spring to install in an old Trek 990 (originally w/ Rockshox Indy XC w/ 63mm travel). I'm afraid this will eventually damage the frame and wanted to decrease the fork travel w/ a 80mm spring.

    Do I need any additional part to complete this change? What do I need to adjust / take out from the other leg of the fork?

    I am still a complete noob with a very old bike, so I appreciate your help.

  33. #33
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    Anybody end up trying to get the 100mm travel by replacing the left spring? Was it successful?

  34. #34
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    Trying to find info on this fork is quite difficult - I spent quite a few hours searching the internet and most of my results linked back to this thread and the SRAM parts document. I'll add my few cents worth to hopefully help anyone looking in the future.

    The stock spring in the Guardian (1.0) fork did well for my weight and riding style for over 1000 miles. I weigh 255lbs and ride XC with rocky sections and some mild drops. But like anything else I own I thought the fork could use some modifications. I ordered the firm spring with 100mm travel to replace the medium 80mm spring in my fork. The replacement is stupid simple as noted in previous posts. I replaced both the spring and the lower rod. Took fifteen minutes due to distractions from the rambunctious kids in the house. Probably could be completed in five minutes! The stock spring did not have much grease at all on the coils so I coated the new spring before installing.

    The travel is determined by a removable plastic spacer attached to the spring coil. The 80mm spring has a spacer that is 20mm longer than the 100mm spacer and stops travel sooner. A rider looking to increase travel from 80mm to 100mm for free could probably get away with trimming the spacer on the stock 80mm spring.

    The oil volume listed on the SRAM document is the same for 80/100mm travel so I have not messed with anything on the right side.

    The firm spring is just that - quite firm! I will be experimenting with the different combos of medium and firm springs as well as the 80mm/100mm spacers. My first observation is that with the firm spring I need almost zero preload adjustment on the fork. I had the preload cranked up quite a bit with the medium spring. With the firm spring in place I have a hard time compressing the fork much at all while static testing. I've yet to get a ride in on the firm spring with 100mm travel (again, those pesky kids!lol) but I'll report back when I get the chance.

    Also, as a warning to anyone looking at increasing the travel to 100mm, I do believe I read in the warranty for Airborne that use of an increased travel fork voids said warranty. Not sure but just a heads up!

  35. #35
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    Quote Originally Posted by mark729 View Post
    I got UPS today. Firm Spring~!

    Click image for larger version. 

Name:	20130620_184828_zps0d5211fa.jpg 
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    First unscrew top knob which has preload adjustment.
    after take it out, push down handle bar and take out top spring part.

    and take bottom nut(A) with allen wrench.
    Click image for larger version. 

Name:	20130620_201752_zpsec27fac3.jpg 
Views:	368 
Size:	469.2 KB 
ID:	809639
    Click image for larger version. 

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    Bottom part(B) won't come out unless you hammer it(C) out.
    Click image for larger version. 

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ID:	809640

    Put some grease on new bottom part and put it back to the shock.
    Put some grease on new top spring part and put it back to the shock.
    It will push down bottom part so you can screw the bottom nut which is A in picture
    and tight the preload adjustment knob.
    that's it.
    It would take 20minutes.

    and for someone like me.
    Here is the picture shows how preload work.
    Click image for larger version. 

Name:	20130620_202847_zps041ad0a6.jpg 
Views:	2280 
Size:	200.4 KB 
ID:	809646
    Is it necessary to get that rod out installing the heavier spring ? I can't get mine out , afraid I'm going to break something hammering on it.

  36. #36
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    @JohnFL

    i had some trouble as well. at first i tried using a screw driver placed on the edge of "c."
    the screw driver slipped off of the edge and went into C were the treads are... this is what i was trying to avoid. so i tried using an allen key big enough to to stay out of the threads but small enough to get in there. lots of hammer and still no results. so since there was a replacement for everything i just said screw it.. got the screw driver again and steeled my reserve... it definitely wasn't just a few taps...i was going Happy Gilmore at this point ... tap taparo... why wont you tap out... come out... you don't want to be in there... get the hell out of there! and finally that greasy bastard came free and plopped out onto the floor.

    got everything inside easy enough. there was one part that came with the spring kit... a rubber cylinder with 2 groves... no idea what it was for... no one mentioned it in any videos or pictures so i figured i shouldn't worry... still bugs me... anyone know what it is for?

    also... anyone have any tips on how to properly "tap" this guy out. im sure there is a proper tool... and even without a tool designed for this sole purpose.. there has to be a better way than what i did. more info on proper techniques would probably help with anxiety when banging on expensive toys.

    my only tip which is probably just common sense... i removed the front wheel... i didn't want to be swinging hammers and bashing the brake's disc

  37. #37
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    Just ordered the guardian 2.0, but I'm a bigger dude (245#) so planning on buying the firm spring as well. The 2.0 already has 100mm, so looking for the RockShox XC28 Spring Internals Left 29 100 Firm Red - This seems to be the stiffest they make, but is also out of stock most places.

    Want to make sure I'm reading everything right, but it seems like replacing the lower rod is optional? In other words, if its basically a brand new bike, getting a second with the firm spring is like a spare, correct? I just swap the spring, but the caps back on, and it's stiffer? Then down the road, maybe when servicing the fork, I could swap out the lower rod after some mileage?

    To sum it all up, everyone with their "I had to pound on it pretty hard to get it out" is making me wonder how valuable this step even is. . . . .

  38. #38
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    Quote Originally Posted by hadley.michael View Post
    Just ordered the guardian 2.0, but I'm a bigger dude (245#) so planning on buying the firm spring as well. The 2.0 already has 100mm, so looking for the RockShox XC28 Spring Internals Left 29 100 Firm Red - This seems to be the stiffest they make, but is also out of stock most places.

    Want to make sure I'm reading everything right, but it seems like replacing the lower rod is optional? In other words, if its basically a brand new bike, getting a second with the firm spring is like a spare, correct? I just swap the spring, but the caps back on, and it's stiffer? Then down the road, maybe when servicing the fork, I could swap out the lower rod after some mileage?

    To sum it all up, everyone with their "I had to pound on it pretty hard to get it out" is making me wonder how valuable this step even is. . . . .
    I would wait and ride it first. I never bottomed mine out with the stock spring. It was stiff as hell.

  39. #39
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    Quote Originally Posted by Glyphic View Post
    I would wait and ride it first. I never bottomed mine out with the stock spring. It was stiff as hell.

    For sure. I've heard a lot of people say it's soft, but mostly on the 1.0. Maybe the 20mm extra travel on 2.0 means there's enough room not to bottom out. Will def. wait and see.

  40. #40
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    Got my guardian on Friday, last week. Been on a few quick rides, nothing crazy, but am ok with the stock spring for now. Haven't hammered it or anything, but haven't even felt close to bottoming out yet. Will probably keep it for the rest of this year, test on some bigger hits and see how it goes.

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