Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    cycles per second Gonzo Bob's Avatar
    Join Date
    Oct 2003
    Location
    Minnesota
    My Bikes
    Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
    Posts
    1,790
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Converting old rigid MTB to front susp

    My old MTB is pre-suspension era. It's time to replace the headset and as long as I'm doing that, I thought I'd look at also changing to a suspension fork. Has anyone done this? Any issues? What happens to the handling when raising the front end?

    Also, the current headset/fork/headtube is JIS. Would I be able to fit 30.2mm ISO headset cups into my 30.0mm headtube? (I'm assuming any new susp fork will be ISO).
    Last edited by Gonzo Bob; 08-07-06 at 11:35 AM.

  2. #2
    cyclist/gearhead/cycli... moxfyre's Avatar
    Join Date
    Oct 2004
    Location
    DC / Maryland suburbs
    My Bikes
    Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
    Posts
    4,172
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    There was a recent thread on here in which someone asked a similar question about putting headset cups into a headtube that was 0.2 mm too small. You might want to search for it...

    I believe a well-equipped LBS could probably machine your head tube to accomodate the 30.2mm cups, if they don't fit. This would almost certainly be possible with a steel head tube, I'm less certain if it would be safe with a thin-walled aluminum head tube.
    My bikes | Linux and Python stuff | Photo gallery

    Sheldon Brown, I miss you. Thanks for the advice, ideas, humor, and infectious enthusiasm for everything bikes...

  3. #3
    Bike Junkie roccobike's Avatar
    Join Date
    Jun 2005
    Location
    South of Raleigh, North of New Hill, West of Harris Lake, NC
    My Bikes
    Giant OCR-C, Specialized Tarmac, Specialized Stumpjumper FSR, Stumpjumper Comp, 05 Rockhopper, 88 & 92Nishiki Ariel, 01 Bianchi Campione, 87 Centurion Ironman, 92 Paramount, 97 Lemond
    Posts
    8,891
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've made the fork change to an old Nishiki Ariel with a 1" head. I did all the work and I'm not a bike mechanic. If you intend to ride on the road, my advice, don't make the change. If you are using the bike off road and want a suspension, then yes, IMHO it's worth it. It appears you have a 1 1/8 head. This also means your frame is probably a newer geometry design. My old Nishiki was lifted nearly 2 inches and changed the handling of the bike. I used a fork with only 40mm travel.
    On the other hand, I now have a 97 GF Tassahara that has a more up to date geometry frame. I'm preparing to mount a Rock Shox to it with about 70mm travel. This change will only lift the frame by 3/4 of an inch because the frame was designed for a shock and the rigid fork is extended, compared to the old rigid forks, to compensate.
    If your already making the headset change, I say go for it. By the way, the biggest problem I had with the Nishiki was the brakes because that bike has the old cantilever brakes. I had to make my own bracket to prevent the fork from compressing when I applied the brakes. If you have V's, like my Tassahara, this is not a problem.
    FYI, I attached a picture of the Nishiki after the fork was added.
    If I can provide any additional information or answer any questions about this, feel free to PM me.
    Attached Images Attached Images
    Roccobike BF Official Thread Terminator

  4. #4
    biked well well biked's Avatar
    Join Date
    Jul 2005
    Posts
    6,799
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    [QUOTE= Would I be able to fit 30.2mm ISO headset cups into my 30.0mm headtube? (I'm assuming any new susp fork will be ISO).[/QUOTE]

    You should be able to have the head tube reamed to the ISO size, but I don't believe it will fit, otherwise.

  5. #5
    cycles per second Gonzo Bob's Avatar
    Join Date
    Oct 2003
    Location
    Minnesota
    My Bikes
    Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
    Posts
    1,790
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hey, thanks RB. I've been using the bike as a commuter but I just finished putting together an old road frame to use for commuting and touring so the MTB will revert back to off-road duty. I raced an off-road triathlon no too long ago and could barely grip the handlebars at the end of the ride so I am looking for a little relief. The bike is even older than yours - 1987 Diamondback with 1" headset and cantis. Do any susp forks come with the canti cable stop or would I likely have to fab one?

  6. #6
    Bike Junkie roccobike's Avatar
    Join Date
    Jun 2005
    Location
    South of Raleigh, North of New Hill, West of Harris Lake, NC
    My Bikes
    Giant OCR-C, Specialized Tarmac, Specialized Stumpjumper FSR, Stumpjumper Comp, 05 Rockhopper, 88 & 92Nishiki Ariel, 01 Bianchi Campione, 87 Centurion Ironman, 92 Paramount, 97 Lemond
    Posts
    8,891
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Gonzo Bob
    Hey, thanks RB. I've been using the bike as a commuter but I just finished putting together an old road frame to use for commuting and touring so the MTB will revert back to off-road duty. I raced an off-road triathlon no too long ago and could barely grip the handlebars at the end of the ride so I am looking for a little relief. The bike is even older than yours - 1987 Diamondback with 1" headset and cantis. Do any susp forks come with the canti cable stop or would I likely have to fab one?
    I used a Suntour 3000 fork from NYCBikes.com The fork cost about $35-40 with shipping and has a 1" threaded steerer. Since you've stated you have a 1" head, I strongly recommend you get the fork then change the head. This way you have the option of obtaining a threaded or non-threaded fork. Other than NYC bikes, (who has two brands of 1" threaded forks), there are only two other options, buy a new fork by RST from your LBS (estimate about $100 for the fork, not installed when I priced it at two LBSs) or ebay.
    One inch forks are available on ebay but there are two problems, they sell for higher bucks than I think they are worth (you may disagree) and they are frequently old forks that may need repair or, if they are elastomer suspension, may not be able to be repaired. An old fork on ebay is the only way I know to obtain a canti cable stop. I gave up and fashioned one from a steel brace and bolted it to the reflector hole using a bolt and rubber non-skid strips. It's not very good since it is now beginning to flex, but it has never moved side to side.
    Like I said at the start, this isn't easy, but it can be done. Keep in mind, this change is going to alter the geometry of your bike. If you're like me, that's a small price to pay to reduce the shock to your arms and neck. The Suntour 3000 only has 40mm of travel. I've bottomed out 2 or 3 times on a ride. But by the time the fork bottoms out, I estimate over 80% of the shock has been absorbed, I'm still way ahead of a rigid set up. Good luck GonzoBob. Feel free to PM me about any questions you might have.
    Roccobike BF Official Thread Terminator

  7. #7
    Bike Junkie roccobike's Avatar
    Join Date
    Jun 2005
    Location
    South of Raleigh, North of New Hill, West of Harris Lake, NC
    My Bikes
    Giant OCR-C, Specialized Tarmac, Specialized Stumpjumper FSR, Stumpjumper Comp, 05 Rockhopper, 88 & 92Nishiki Ariel, 01 Bianchi Campione, 87 Centurion Ironman, 92 Paramount, 97 Lemond
    Posts
    8,891
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    GB, I found a better picture of the Nishiki set up I used. The black cable is the brake cable I revised for the fork. All the other cables are the original white cable.
    Attached Images Attached Images
    Roccobike BF Official Thread Terminator

Posting Permissions

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