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Thread: is it..

  1. #1
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    is it..

    Possible to get a 100mm fork for my Trek 3900?
    it came with a 80mm, but im wondering for when i start looking to upgrade stuff when I get my J-O-B lol.

  2. #2
    PBR Racing RIC0's Avatar
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    yes a 100 will work, I've used a 100 on my Trek 4300 in the past. The frame will only support 100mm and nothing bigger.
    Santa Cruz Tall Boy
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    yea im looking to get a 100mm too for my 3900.

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    Senior Member pyroguy_3's Avatar
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    Quote Originally Posted by RIC0 View Post
    The frame will only support 100mm and nothing bigger.
    Not true, you need to look at the total length of the fork, crown to leg. On the right track though RICO. I changed to a 130mm from a 100mm and the overall length difference was negligible.
    Erwin Schroedinger will kill you like a cat in a box. Maybe.

  5. #5
    Why not? EthanYQX's Avatar
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    You can do it, but you need to check the A-C height.
    "It is not the critic who counts."

  6. #6
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    You all are speaking above my level lol!
    So like what forks will work?
    Cause 80mm isnt enough for me. if i hit a big enough root or dip i bottom out.
    --- Im only 165 lbs so dont call me fat LOL.


    Now another question while I have everyones attention.
    Is it normal to have some play in the neck area?
    Like when i hit my front brakes and move the bike forward i can feel the fork wiggle inside the neck.

    I made sure the bolt was tightened all the way, and it still has some play.

  7. #7
    Why not? EthanYQX's Avatar
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    Noooo. That's not good. I'd get that checked. Hints at a headset issue. Should be warrantied.

    As for the fork, when you check the specs on a website the measurement you need should be listed as "Axle to Crown height" or something resembling. Find out the A2C on your stock fork, and see that it matches. If you're buying from a LBS, even better. Tell the employee what you have and ask them to check the A2C. You can also ask for a list of forks that will work if he finds you the A2C
    "It is not the critic who counts."

  8. #8
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    http://www.srsuntour-cycling.com/SID...tail&tnid=1641
    i believe thats the fork i currently have.

    just mines blue.

    ever since i got the bike its had that tad bit of wiggle in it, So, im guessing i should take it in to get looked at?

  9. #9
    Why not? EthanYQX's Avatar
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    Yes, defenitely take it in.

    A2C is not listed, odd.

    EDIT: On second thought, email them here: service@usulcorp.com
    Ask for the A2C of that fork, link to it if nessecary. If they have any type of customer service they should tell you no problem.
    "It is not the critic who counts."

  10. #10
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    any one know about the adjustments on that fork?

    on the adjustment knob theres a little clear area with a yellow bar in it with red lines.
    when i turn the knob, the yellow bar does not move.
    I figured that if i turn the knob the yellow bar should go up and down...
    IDK..

  11. #11
    Why not? EthanYQX's Avatar
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    Ask about that too when you bring the bike in for the clunking, if no one else weighs in.

    Your LBS gives you a warranty for a reason. I was there every day for two weeks after I got my last bike.
    "It is not the critic who counts."

  12. #12
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    Its such a pain to go the whole way across town though LOL>

  13. #13
    Why not? EthanYQX's Avatar
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    Set a day aside and make it a ride.
    "It is not the critic who counts."

  14. #14
    Senior Member pyroguy_3's Avatar
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    You should be checking the bolts' torque every once in a while. Especially when it is a new bike. I check the bb cups, crank bolts, headset, etc. every month-2 months depending on if I have time or feel like it. I did ruin a bb because the cups worked loose. I didn't have the right size crank puller so I just forgot about it until I burned the bb out. I also had the headset looseness problem. Unfortunately I learned from experience that a loose headset can ovalize the headset. Also, it may just be the fork stanchions having play between the lowers. Also, if you had a better fork it probably wont bottom out on you. There isn't much adjustability in a lower-end fork. Upgrades are wonderful!
    Erwin Schroedinger will kill you like a cat in a box. Maybe.

  15. #15
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    Quote Originally Posted by pyroguy_3 View Post
    Also, if you had a better fork it probably wont bottom out on you. There isn't much adjustability in a lower-end fork. Upgrades are wonderful!
    Agreed. The fork bottoming out is not an indicator you need more travel, but more adjustability within the travel you already have. That said, I would still make the jump up to 100mm.

  16. #16
    Generic Title ProFail's Avatar
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    Quote Originally Posted by Cheeto View Post
    Its such a pain to go the whole way across town though LOL>
    EGREGIOUS

    Anyway, to state what already has, as long as the leg length is similar to your 80mm fork, you should have no problems.

  17. #17
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    does anyone know what the height is for an 08 trek 3900?

    19.5 frame

  18. #18
    Senior Member pyroguy_3's Avatar
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    Quote Originally Posted by Cheeto View Post
    does anyone know what the height is for an 08 trek 3900?

    19.5 frame
    The length of the fork? The standover height? For the length of the fork: take a tape-measure and start from the bottom of your headset, where the fork goes through the frame, and measure to the dropouts on your fork, where the axle passes through the fork. This should give you a fairly decent measurement. Might want to take the wheel off so as you can go straight down the center of the fork in your measurement, otherwise you get a little longer measurement due to the angle. Maybe also take the measurement from the top of one side of the crown to the bottom of the leg. I'm not sure what the companies base their measurements on. Anybody?
    Erwin Schroedinger will kill you like a cat in a box. Maybe.

  19. #19
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    trying to find the so called A-C height thingy.
    the more i think about my fox the more it pisses me off and the more i hate it lol

  20. #20
    Senior Member pyroguy_3's Avatar
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    The AC height is an acronym for Axle to Crown height. It's basically outlined in what I posted in #18. You really only need a tape measure. It's not something where they have to be exactly the same, maybe within 40mm? Usually it's better to go longer than shorter, for me at least. I like a more stable steer, while going shorter would make the steering easier to turn basically. Kind of like raking out the front of a motorcycle really far and slapping apehangers on it. Those guys can't turn for ****.
    Erwin Schroedinger will kill you like a cat in a box. Maybe.

  21. #21
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    So

    Does anyone have any ideas as to which fork i should start looking into?
    I have a 3900, so I wont be doing any Dirt Jumping or that crazy downhill stuff.
    Just some normal mountain bike trails, and maybe some XC type stuff.


    preferably 100mm.

    i measured from the to of the fork, where it goes into the headtube thing, to the bottom,
    its about 17 inches.

    Anyone have any ideas on a half decent fork that actually works? lol

  22. #22
    Why not? EthanYQX's Avatar
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    Check out Marz. Find something close to a 17" A2C. Maybe a RS Dart?
    "It is not the critic who counts."

  23. #23
    Senior Member pyroguy_3's Avatar
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    What is your budget? Sorry if you posted it already.
    Erwin Schroedinger will kill you like a cat in a box. Maybe.

  24. #24
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    Ehh, I don't have a set budget.
    Cheaper the better.

    I mean, Im not paying 250 for a fork, as its more than half the price of the bike.
    Ill go maybe no higher than 120-150ish.


    (anyone have any good used ones? LOL)

  25. #25
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    what would i be classified as?
    Cross country or all mountain.

    Id imagine XC, as thats what type of fork the bike came with even though its cheap as crap.


    BTW took my bike into the shop today, well, my dad did, and they fixed my wiggle problem. =)

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