AMP B4. Please Help ID shock. Nubee.- Mtbr.com
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  1. #1
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    AMP B4. Please Help ID shock. Nubee.

    Well, I pulled the trigger and bought the 20" AMP B4 with little deliberation. Seems like a polarizing bike...anyone who reviewed it loved or hated it. The way I see it - for $400 I couldn't go wrong.

    Anyway, the guy I bought it from didn't know much about it, and told me it was a Fox shock in the rear. From what I've heard a Fox shock shouln'd fit? Please see the pics below and help me ID the shock (and fork model for that matter).

    Thanks in advance. Dave911
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  2. #2
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    I'm no expert on the AMP rear shock but it may have been made for AMP by Rock Shox. The fork is a Mars with TPC just like it says & is very smooth even for todays standards. Thats quite the looker you got there, $400 .
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  3. #3
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    Am I crazy or did I see that bike on Craigslist in San Diego? I thought about calling that guy but it didn't have the original AMP fork. The manitou is ofcourse much better but I would have been buying it for its colectability. It was after all one of the most advanced, expensive bikes of its time. It really looks nice!!. If the craigslist pics had been that good I would've jumped on it.

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    Yep, that was the SD craigslist bike. I cruised down from OC this morning and paid cash.

    So you think that's the stock shock that many have complained about? Thnks. Dave911

    OH...And sorry for you missed grabbing her before me!

    Quote Originally Posted by sandmangts
    Am I crazy or did I see that bike on Craigslist in San Diego? I thought about calling that guy but it didn't have the original AMP fork. The manitou is ofcourse much better but I would have been buying it for its colectability. It was after all one of the most advanced, expensive bikes of its time. It really looks nice!!. If the craigslist pics had been that good I would've jumped on it.

  5. #5
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    Fully adjustable air shock.

    http://www.risseracing.com/amp.shtml
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  6. #6
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    Quote Originally Posted by dave911
    Yep, that was the SD craigslist bike. I cruised down from OC this morning and paid cash.

    So you think that's the stock shock that many have complained about? Thnks. Dave911

    OH...And sorry for you missed grabbing her before me!
    Yeah the stock amp fork and original parts make the bike more collectable but ofcourse the upgrades make it more rideable. I actually sold an original amp fork on ebay for 180. They really sucked but they only weighed 2.7 pounds.

    I think that is the stock rear shock.
    Last edited by sandmangts; 06-07-2008 at 08:09 PM.

  7. #7
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    I know where there's another AMP B4 in OC for sale.
    Stock and very little use. About the same price.
    I can send contact info to whoever is interested. D911

  8. #8
    JmZ
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    I think that it might be a Noleen. It looks right. Take a look at the K2/Proflex forum on site or here to look at pics for comparison - http://idriders.com/proflex/smf/inde...d014&board=1.0

    I know that Noleen made rear shocks for Amp style bikes. (Forgot about those... Stratos and Risse were others)

    Only Fox that I knew of was the one they made pull shocks for Turner's stinger Amp B-3 variant. Not the same as the B-3 by a long-shot - more of an evolution of the design.

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  9. #9
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    I'm getting some mixed info on the shock here, while I'm inclined to believe dogonfr (18k posts), the shock doesn't look all that similar to the Risse image / diagrams.

    Can anyone confirm shock brand (stock or Risse)? Thanks all. D911

  10. #10
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    Quote Originally Posted by dave911
    I'm getting some mixed info on the shock here, while I'm inclined to believe dogonfr (18k posts), the shock doesn't look all that similar to the Risse image / diagrams.

    Can anyone confirm shock brand (stock or Risse)? Thanks all. D911
    It's a Noleen.
    "Do not touch the trim"

  11. #11
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    Quote Originally Posted by dave911
    I'm getting some mixed info on the shock here, while I'm inclined to believe dogonfr (18k posts), the shock doesn't look all that similar to the Risse image / diagrams.

    Can anyone confirm shock brand (stock or Risse)? Thanks all. D911
    My post count has nothing to do with knowledge, the Risse link was a suggestion for a replacement if so inclined.

    Thanks for the ego boost.
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  12. #12
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    That is the stock shock that came on the bike. I don't remember who made it, but that does not matter. You can ride it, but it will blow. Go to Risse and get the astro-5 for $298.00. Save that shock and ride it in 3 or 4 years while you have the Risse rebuit for about $40.00(it is about a 4 day turnaround). That is what I did, and I have been riding my B4 with a carbon rear triangle 4-6 times per week (East Coast woods single track and 24 hour endurance races) for 10 years now. And BTW, it weighs 21.75 lbs. It is lighter than the Bontrager Ti I used to have.

  13. #13
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    Can't say on the shock, but it reminds me of the Noleen.

    Anyway, please make sure you reposition your skewer lever so that it can close fully. Looks like it's not completely closed. If it doesn't go 'over center', it could open while riding. I'd rotate it to where it won't contact the leg, and when it's tight enough, you should have a backward KORE imprint on your hand. If I'm stating the obvious, sorry.

  14. #14
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    Amp shock

    Hi
    Shock on bike is Amp, HL built his own shocks, forks, hubs and disk brakes. You can get manuals and hopefully parts from AMP Research at

    http://www.amp-research.com/products/misc/bikes.asp

    They have tools as well and everthing is easily rebuilt.
    PS I have a B5 if anyone is interested

  15. #15
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    Quote Originally Posted by c-rider
    Hi
    Shock on bike is Amp, HL built his own shocks, forks, hubs and disk brakes. You can get manuals and hopefully parts from AMP Research at

    http://www.amp-research.com/products/misc/bikes.asp

    They have tools as well and everthing is easily rebuilt.
    PS I have a B5 if anyone is interested
    Nope, not an AMP shock. I'm very familiar with these bikes as I live close to AMP and had friends who worked and raced for them. Clearly a Noleen.
    "Do not touch the trim"

  16. #16
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    Not so sure...

    I am the Canadian distributor for AMP (moot point since they aren't selling new bikes anymore, but I have a lot of AMP stuff in my basement as a result). I only recall Risse making the upgraded shock, and then it was air. A coil upgrade shock? Could be, but I don't recall that myself.

    Now, about the forks - I gotta disagree with others on this point. Yes, they track amazingly well (like a rigid fork, no flex to speak of), and they work awesome in terms of suspension. And of course, they are still among the lightest available anywhere. My carbon F3 is 2.1 lbs - try to find anything close to that without significant flex. The thing that stands out about these forks is that they track forward in compression - or, more specifically, the wheelbase does not shorten when they compress. What that amounts to is that the fork feels as though it progresses beyond the obstacle (root, rock, whatever) and almost propels forward - it doesn't slow down, it maintains speed or jumps forward. And not in an uncontrollable way - I've never felt more in control than when I've ridden an AMP fork (on any bike, which includes ultralite HT's, FS's (AMP's, Heckler, multiple Ellsworth Truth's, etc.), all bikes).

    Enjoy the ride - I regret selling my B5, and will likely purchase a B4 or 5 before long, and race it next year. The only thing that came close to comparing was my 99 Truth, and my wife rides that now so I can't pry it from her. I upgraded to a 2001 Truth, but the word upgrade is very loose - more geared toward comfort and 24hr racing than pure speed XC. but I digress...

  17. #17
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    Thanks for chiming in. I've been riding the B4 four days a week now for a few months...mostly XC, and I LOVE this bike.
    At first it felt a bit flexy, but after dialing in the fork, the bike is very predictable and controllable. I put her anywhere on the trail I want.
    The rear shock isn't great (OK sux), but she'll do for now. Will go risse as family / money allow.
    Also, ended up cracking the super-light cranks on a small jump with flat landing. Ended up buying some beautiful, vintage White Industries 175mm cranks on Fleebay, and they'be been creak / groan free. See pic attached.

    L8. D911
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  18. #18
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    Quote Originally Posted by dave911
    Also, ended up cracking the super-light cranks on a small jump with flat landing. Ended up buying some beautiful, vintage White Industries 175mm cranks on Fleebay, and they'be been creak / groan free. See pic attached.

    L8. D911
    Funny, I was just looking at the first pictures you posted, and I thought to myself, "Hmmm, those look like Kooka cranks. I hope those hold up ok for him."

    I went through a few pair of Kookas back in the day. All of them creaked and ended up cracking. The aluminum seemed very hard and brittle compared to the cold forged Shimano units I ended up with.

  19. #19
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    Yep, those are stained Kooka cranks. Nice to look at, but a little too light for durability. They're gonna be mounted on the wall when the garage redo is done.

  20. #20
    Birdman aka JMJ
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    Owned one

    Might be a little late, but....

    That is not a stock AMP rear shock. The stock AMP shock was a LOT smaller. Anyway, it wasn't great - plagued by AMPhysema (wheezing of the damper). I replaced mine with a Risse Genesis air/oil shock for much better performance. Not as adjustable as the Astro, but once dialed in, it was very good, and light.

    Also, the front shock is not OEM - the AMP F-4BLT or F-3XC linkage forks were awesome once you dialed them in. If you were "out of the zone" for your weight/riding style, they were terrible. A lot of bad reviews for this shock by people who didn't have them adjusted properly.

    I sold my 1996 AMP (B-4 w/ F4-BLT, for a 2001 SC Superlight - I like the extra travel, but not the extra weight.

    JMJ

  21. #21
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    This post should be stickied or relocated for Amp riders to get some great info.
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  22. #22
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    TTT - The shock definitely needs to be rebuilt. Can anyone positively ID the mfg? If not, I'll send to Risse and see if they can rebuild or replace. Thanks for your input. Dave

  23. #23
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    Ordered the Risse Racing Genesis shock. Nice people over there. Will report back with pics. Thanks all. D911

  24. #24
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    Quote Originally Posted by dave911
    Ordered the Risse Racing Genesis shock. Nice people over there. Will report back with pics. Thanks all. D911
    Sounds awesome this means more Porn
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  25. #25
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    A bit more visual info for posterity...
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    Non-stock older shock is a 0.75" longer than the RR shock. Kevin at Risse Racing will review for affects on geometry and travel. Will post findings. D911

  27. #27
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    Its the horrible stock shock that you definitely need to get rid of....... grab a Risse someplace......

  28. #28
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    E-Rudy...check the pic above....that's the RisseRacing shock getting ready for install. Best, Dave911

  29. #29
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    Update = Shock that came with bike is NOT stock. Risse Racing shock is the correct length. Should improve the ride tremendously....once Kevin sends the correct size bushing for installation. (C;

  30. #30
    JmZ
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    Not surprising...

    It is a Noleen, which means it was probably off of something like a Proflex (also known as K2, Noleen), a Mantis Profloater, one of Supergo's early duallies, or another Amp knock off's from the early days.

    The Noleen, if it was working right, and the right size, would have been an improvement on the stock Amp shock.

    I remember seeing one back while in college, and even then I knew it was a bit lightweight for me.

    Quote Originally Posted by dave911
    Update = Shock that came with bike is NOT stock. Risse Racing shock is the correct length. Should improve the ride tremendously....once Kevin sends the correct size bushing for installation. (C;
    JmZ

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  31. #31
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    Slow process but coming along good.
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    shock bushing arrived...too long...

    New shock-mount bushing (top) arrived. Unfortunately, the bushing was too long and did not fit between the suspension mounting tabs on the frame.

    I dremel-tooled the bushing to fit between the tabs, and PRESTO! The shock slif into place.

    See pic of new shock mounted.
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    Seat post change

    NOTE - Shock is MUCH shorter than the Noleen (I think) that is replaced. See see post height change required to maintain same leg extension during stroke.
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  34. #34
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    Profile shot

    Geometry looks quite different...with the rear triangle running closer to the top tube angle.

    Will give ride review later...
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    Last edited by dave911; 04-19-2009 at 02:55 PM.

  35. #35
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    Very nice great to see old technology still rolling along.
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  36. #36
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    You talking about me or the bike? (C;

  37. #37
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    Quote Originally Posted by dave911
    You talking about me or the bike? (C;
    Since I dont know ya I'll say the bike.

    Hello Dave im David good to meet ya.
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