Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8
  1. #1
    -- TREK RIDER -- Quadzone.com's Avatar
    Join Date
    Aug 2005
    Location
    Sumwaresin, KY
    My Bikes
    Trek 4300
    Posts
    163
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Changing 80mm forks to 100+mm forks

    My Trek has an 80mm fork on it. I will be getting a new fork soon but I"m not sure on what the size limit is on a new fork that I buy??? All I do XC ride no dirt jumping, freeriding,etc, etc. I"m thinking the frame was built to not go over 120mm, or it would look funny with the front end way up in the air?? but I really have no idea. Please explain to me what size I should get and why??? thanks for the info.
    My drinking buddies have a racing problem !!!

  2. #2
    The Rabbi seely's Avatar
    Join Date
    Apr 2004
    Posts
    4,859
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Call Trek and ask them. Most likely you will void your warranty going to anything longer than the bike came with.
    commuter turned bike mechanic turned commuter (also a Velocity USA employee, but this is my personal account)

  3. #3
    Senior Member ankush's Avatar
    Join Date
    Sep 2005
    Posts
    182
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    actually i am curious about this too. i have a trek 6500 which came with an 80mm fork. the fork is a little soft for my riding. also the travel is a little less i think because sometimes the top and bottom part of the travel tube or whatever that is called touch. yknow? like the part where the crown is (?) and the place below where the seals are. warranty issues aside, is it possible for me to change this fork at a later date for something with more travel? what is the maximum i can go? how will having a bigger travel fork change the feel of my bike? harder to handle?

    the mechanic at my bike shop told me he cannot change the spring inside the fork to a harder one. but i read i think in the manitou manual that this fork (axel elite) can be adjusted if you take it apart from 80 to 100 mm. is that true or did i misread the thing? cant i just change the damn springs on my own ?

    also, one last question, sorry, how can i use lubricant on my fork and what kind of lube do i use? i washed my bike pretty well the other day, stripped down the derailleurs etc etc, and well the fork stanchions seem pretty dry now and i think when i brake hard they make this noise. i mean there is a noise and it seems it is from the fork. i am thinking maybe because it is dry and i need to lube it? to lube it can i just rub some grease on the stanchion itself? i read somewhere you have to pop the seals, push hard on the fork so this ring with the lube pad comes up and then put the lube there, but man that seems risky, i dont want to screw up those seals...
    Trek 6500

  4. #4
    ÖöÖöÖöÖöÖö Dannihilator's Avatar
    Join Date
    Oct 2002
    Location
    Annandale, NJ.
    My Bikes
    2014 Surly Steamroller 2010 DMR Transition 26
    Posts
    18,354
    Mentioned
    14 Post(s)
    Tagged
    1 Thread(s)
    The 20mm rule comes into play here. If it's more or less than 20mm change, it will void the warranty unless desgined to accept a bigger range, in this case the treks you mentioned are designed to take up to 100mm of travel.
    Quote Originally Posted by scrodzilla
    I'm going out on the town tonight and it won't be over until I snort a line of habanero seeds off the hood of a red Fiero.
    Words and Stuff.
    pedal room thingy

  5. #5
    The Rabbi seely's Avatar
    Join Date
    Apr 2004
    Posts
    4,859
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Besides, bottoming out is NOT a function of the travel being to short. Manitou makes an 80mm Sherman for DJing and freeriding that my friend and I have tried mercilessly to bottom out, off of 6 stair sets and 4ft drops with no luck. It all comes down to construction of the fork.
    commuter turned bike mechanic turned commuter (also a Velocity USA employee, but this is my personal account)

  6. #6
    ÖöÖöÖöÖöÖö Dannihilator's Avatar
    Join Date
    Oct 2002
    Location
    Annandale, NJ.
    My Bikes
    2014 Surly Steamroller 2010 DMR Transition 26
    Posts
    18,354
    Mentioned
    14 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by seely
    Besides, bottoming out is NOT a function of the travel being to short. Manitou makes an 80mm Sherman for DJing and freeriding that my friend and I have tried mercilessly to bottom out, off of 6 stair sets and 4ft drops with no luck. It all comes down to construction of the fork.
    Absolutely.
    Quote Originally Posted by scrodzilla
    I'm going out on the town tonight and it won't be over until I snort a line of habanero seeds off the hood of a red Fiero.
    Words and Stuff.
    pedal room thingy

  7. #7
    Senior Member ankush's Avatar
    Join Date
    Sep 2005
    Posts
    182
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    "Besides, bottoming out is NOT a function of the travel being to short"

    cool. i did not know that. it makes sense though when you think about it i guess. though i have to make do with what i got right now so i am basically mostly just riding my bike with the thing locked out. (it has a lock out function, which i dont really care about cuz man i want suspension). is it possible for me to change the spring inside? if so, is it advisable to try do it on my own cuz my bike shop fellow said he cannot?

    also, the lubricant thing. the stanchions (?) of my fork are totally dry. shouldnt the things get lubricated everytime they go down into the tubes? everytime the fork sinks in long it makes this loud noise as if something is being grinded. how do i lube it up so i can atleast switch the damn lock out thing off when im not going on the cowtrail where the thing bottoms out?

    also, for arguments sake, or informations sake, if i dont care about warranty, and put a, lets say, 130 mm travel fork in my bike that originally came with an 80 mm travel fork, (let alone why i would need to do this on a cross country bike, like i said, just information sake) is this going to drastically change the way my bike handles? is it going to f**ck up the geometery or make it change for the worse if the kind of riding i am doing requires a lot of pedalling but also involves good bumpy steeps?

    just curious, i wont be changing the fork on my bike for a some time that is for sure, whether it bottoms or not. but i am just wondering. my manitou axel elite is too soft for me. if i ever change this fork, which i will sooner or later, putting a Fox or SID or U turn 80 mm fork is okay for my kind of riding or should i get atleast 100mm? (the bike shop here does not have marzochhi (sp?))


    (ps- this site is really helpful. thanks very much, and im hopelessly sorry for being a babbling pain in the ass)
    Trek 6500

  8. #8
    -- TREK RIDER -- Quadzone.com's Avatar
    Join Date
    Aug 2005
    Location
    Sumwaresin, KY
    My Bikes
    Trek 4300
    Posts
    163
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by KonaRider24
    The 20mm rule comes into play here. If it's more or less than 20mm change, it will void the warranty unless desgined to accept a bigger range, in this case the treks you mentioned are designed to take up to 100mm of travel.
    That's what I need to know, thanks KonaRider..

    I'm pretty sure all forks can be rebuilt with a stiffer or lighter spring. I was told by several shops you couldn't do it on my cheapo RST fork but called RST and they said, Yuuuup We make a heavier spring kit for that. So when I called the shop I bought my bike from they said the same thing and I had to correct the bike mech. and say, yeah they do, I was just told by the company that they make a kit. Some dealers I think would rather you buy a new fork than spend small $$$$ to make something better, IMO.

    Now about the bottoming out part. Shouldn't your fork bottom out on occasion which shows your getting full travel out of the fork??? When I say bottom out I dont' mean break your wrist from the impact but getting full travel. If I run a 100mm fork I want 100mm of travel not 85 per say.
    My drinking buddies have a racing problem !!!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •