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Thread: Shorten fork 1 inch

  1. #1
    jspringator's Avatar
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    Shorten fork 1 inch

    I have shortened the rear of my ST1100 (ABS II) approximately 1.65 inches; 1.25 inches with a shorter works shock and approximately .4 inch with a 60 series rear tire.

    I slid the forks up in the triple trees 3/4 inch. That lowered the front approximately .65 inch. If I could shorten the fork 1 inch the front and rear would be in balance. Shortening the forks 1 inch would lower the bike only .88 inch, but that should be enough to get it pretty close. If I decided to go back to the stock tire I could simply alter the forks.

    I spoke to the nice folks at Traxxion, and they could do the job for $500. I'm not sure what all that includes. The problem is that I would have to separate the forks from the bike and ship to them, or take the bike to Atlanta.

    I have a pretty good independent mechanic locally who used to work for a dealer. If I got the parts and gave him instructions on what to do I'm sure he could do it.

    I like a soft ride, so I am hoping to keep the stock springs, cut any spacer, replace the fluid, and bushings.

    I need to give him directions on how to cut the spacers, how much fluid to put in each fork (ABSII), what weight of fork oil to use, and what bushings to replace. My bike is an 00 ABS II.

    Does anyone have any ideas?
    Last edited by jspringator; 11-28-2017 at 11:36 AM.
    2000 ST1100 ABS 40,000 miles, RDL, Helibars, X-Creen on Clearview shield, lower Works shock, PR4GT with 60 series rear tire
    06 XT225 RDL, Webcams cam, Beehive racing valve springs, High compression piston, cheap motard conversion

  2. #2
    STOC #687 dwalby's Avatar
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    Re: Shorten fork 1 inch

    Before paying $500 to have the forks permanently modified, have you experimented with changing the ride height with different size spacers in the forks?

    Also, seems like a lot of trouble for an additional 1/4" difference, since you already have them 3/4" up in the tree. I'm not sure how much difference 1/4" is really going to make.

  3. #3
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    jspringator's Avatar
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    Re: Shorten fork 1 inch

    I have never see these forks. Are there spacers they can remove? Im going to be lowering the forks an inch. That will lower the bike .88 inch. That plus the forks will be fairly close to 1.65 inch.

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    SoCal Lane Splitting Commuter SupraSabre's Avatar
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    Re: Shorten fork 1 inch

    Quote Originally Posted by jspringator View Post
    I have never see these forks. Are there spacers they can remove? Im going to be lowering the forks an inch. That will lower the bike .88 inch. That plus the forks will be fairly close to 1.65 inch.
    Just get thicker boots?
    Bob - STOC 5901
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    Motorcycle nut the Ferret's Avatar
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    Re: Shorten fork 1 inch

    I am a munchkin, 5'6" 26" inseam. I had Spencer lower my seat an inch and put in LD foam. I think that was less than $100
    Harleys 65 M50, 59 XLCH, 49, 56 & 57 Pans, 94 XLCH Hondas 66 CB160, 67 CL77, 68 CB350, 73 CB350F, 67 CB450, 76 CB750K, 85 VF1100S, 00 CB750, 06 ST1300, 13 CB1100, 14 CB1100 Suzukis 76 GT750, 81 GS850G, 83 GS1100E Kawasaki 77 KZ1000 Yamahas 73 RD350, 73 TX650, 79 XS650, 81 XS650, 04 FZ1, 01 FZ1 Triumph 03 Bonneville T-100 BSA 69 750 Rocket 3

  7. #6
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    jspringator's Avatar
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    Re: Shorten fork 1 inch

    I've already lowered the back. I'm just trying to get the front and rear to match.

    I have a RDL. Great seat.

  8. #7
    STOC #687 dwalby's Avatar
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    Re: Shorten fork 1 inch

    I just re-read your original post and now I realize that what you want to do is lower the front an additional 1" over the 3/4" you already have, missed that first time, thought you wanted 1" total.

    Yes, there are preload spacers in each tube that are the normal way of adjusting ride height. If you shorten the spacer the bike sits lower, but if you shorten it too much your available fork travel decreases and you may bottom it out over big bumps. There's really nothing to lose by experimenting with shorter spacers, you can make them out of 1" PVC pipe. I think you're probably OK going with 1" shorter spacers, plus the 3/4" you already have with the tubes dropped. You will lose 1" in available fork travel, but according to the service manual there's 5.9" of travel, so you'd have about 5" instead.

    Also, if you think about it, if you're considering having the tubes shortened by 1" you're going to have to shorten the spacers by 1" to keep the spring preload the same anyway. So you can try the 1" shorter spacers first in the full length tubes, and if that 1" loss in available fork travel is problematic, then have the tubes cut down 1" and use the same spacers in the shortened tubes.
    Last edited by dwalby; 11-28-2017 at 11:59 PM. Reason: changed fork travel values

  9. #8
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    jspringator's Avatar
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    Re: Shorten fork 1 inch

    How about fork oil viscosity and amount of fork oil in each side? It is an ABSII.

  10. #9
    Grabcon's Avatar
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    Re: Shorten fork 1 inch

    Okay I have to ask. What is you goal in lowering the bike? I can think of many reasons not to lower it.

    My wife had a 2000 ST1100 and she is 5'4" and was able to handle it in most situations. We did cut down the Corbin seat that came with the bike, we took almost 2" out of the saddle. She still was tippy toe while on the flat. Roads canted the wrong way did present issues. At the end of the day we got her a different bike that better fit her and her riding needs.


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  11. #10
    Bmacleod's Avatar
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    Re: Shorten fork 1 inch

    My first thought when reading your post was why do you need to get the front lower? do you need the lower height to make it easier to touch the ground or is the bike displaying ill manners because you have changed the geometry. Or, do you feel that you have to mimic what you did on the rear? The reason I ask is because if you are thinking you have to lower it the same on both ends, that isnt always the case. By lowering the rear more, it will decrease the rake angle of the forks and give the steering a slightly slower feel and more straight line stability. I would be more concerned with having the front lower... this would make the steering twitchy. But , the amount of difference your talking about is minimal and you may not notice any difference in handling.

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