Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10
  1. #1
    Senior Member
    Join Date
    May 2010
    Location
    Toronto, ON area
    My Bikes
    2010 Globe Live 2
    Posts
    72
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    long rear rack extenders suitable for child seat rack? need help mounting rack

    Hello,

    I'm somewhat enjoying a new Globe Live 2 (small), enjoyment dampened by the fact that my CoPilot Limo is not mounted on the bike yet!

    I'm having problems mounting the included/necessary Blackburn EX-1 rack onto the bike, and would appreciate advice or comments.

    The seatstays are angled pretty low on the bike placing the seatstay rack eyelets well below the top of the tire, so the rack's included 8-inch long (1.5mm thick, 5/8 inch wide) extenders are waaay too short. I estimate, to reach the eyelets, a 14 to 16 inch long extender is needed, but at such a long length, I expect the extenders to flex on any forward pressure on the rack (e.g, hard braking), yes?

    Does anyone have any advice on mounting the rack?

    I briefly looked at long extenders at a LBS recently, but did not have my calipers with me to see if they were appreciably thicker than what I have. If I were to use a long extender, I should probably put a hard bend as it leaves the rack to make the length down to the eyelet perfectly straight, but is this enough strength to support a child in seat?

    I am also looking at a clamp onto the seatpost to place some eyelets level with the rack, but can't find something that looks especially suitable. The best I've found so far is a collar that looks like a seatpost clamp, and if so, I'll need to grind off the lip that helps the thing sit on the seat tube. (I don't have the device yet; it's on order.)

    Any and all comments appreciated.

    Thanks!

    - Daniel

  2. #2
    Senior Member BCRider's Avatar
    Join Date
    Mar 2008
    Location
    The 'Wack, BC, Canada
    My Bikes
    Norco (2), Miyata, Canondale, Soma, Redline
    Posts
    5,430
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I think what you ordered is actually a seat post clamp that replaces the stock clamp and gives you the higher eyelet holes you're after. As such I sure hope you ordered the one that is the same size as the one on the bike now.

    And you're quite right to worry about the braces likely not being up to the job when they have to bend and reach down so far.
    Model airplanes are cool too!.....

  3. #3
    Senior Member Torchy McFlux's Avatar
    Join Date
    Sep 2007
    Location
    Vancouver
    My Bikes
    NOYB
    Posts
    1,428
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The straps that mount a rack to the upper stays aren't loaded, so they don't have to be that beefy. Once bolted down, those thin pieces of stainless steel are surprisingly tough - even if you need to flex them or extend them to make them fit.
    I've successfully bolted two sets of straps together to mount racks on some small bikes. As long as the right type and quantity of hardware are used (ie. nylock nuts, big washers, etc.) it works fine.

  4. #4
    Senior Member
    Join Date
    May 2010
    Location
    Toronto, ON area
    My Bikes
    2010 Globe Live 2
    Posts
    72
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by BCRider View Post
    I think what you ordered is actually a seat post clamp that replaces the stock clamp and gives you the higher eyelet holes you're after.
    The paper catalog product photo I saw when ordering was tiny; no details were visible. The website photo that I found afterwards shows a lip, proving it's a seatpost clamp. Assuming the 28.6mm size I ordered reflects the diameter of the wider section, unclamped, I can probably grind off the lip, use a rubber shim, and clamp it onto my 27.2mm post. Then I can fiddle with angle aluminum stock... or a straight extender... I dunno.

    Quote Originally Posted by Torchy McFlux View Post
    The straps that mount a rack to the upper stays aren't loaded, so they don't have to be that beefy.
    Under normal riding conditions I expect the extenders to be ok. It's the extreme case (maximal braking with a 40 lb child in the seat) that I am concerned about.

    I've rented a Globe Vienna with a CoPilot mounted improperly (rack tilting forward due to short extenders) and didn't seem to have a problem during the ride. On hard braking, it was the kid's helmet hitting my back, and not the seat! (But he was about 28 lbs at the time.)

  5. #5
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    25,593
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by dchsueh View Post
    ....I found afterwards shows a lip, proving it's a seatpost clamp. Assuming the 28.6mm size I ordered reflects the diameter of the wider section, unclamped, I can probably grind off the lip, use a rubber shim, and clamp it onto my 27.2mm post. Then I can fiddle with angle aluminum stock... or a straight extender... I dunno.
    I don't think this clamp goes on the seatpost but is a clamp that goes on the seat tube to both clamp the seatpost in place and also provide an attachment point for the rack. The 28.6 mm diameter will match the OD of a 1-1/8" seattube so if your bike has a larger diameter seat tube (1-1/4"=31.8 mm or 1-3/8" = 34.9 mm) you may need a different clamp.

  6. #6
    Senior Member
    Join Date
    May 2010
    Location
    Toronto, ON area
    My Bikes
    2010 Globe Live 2
    Posts
    72
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

  7. #7
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    23,821
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I make my own extenders.

    I use a length of 1/2" aluminum channel from Home Depot, cut it to length and make a "V" notch where it has to be bent. Much sturdier than the stays that come with the blackburn rack.

  8. #8
    Senior Member
    Join Date
    May 2010
    Location
    Toronto, ON area
    My Bikes
    2010 Globe Live 2
    Posts
    72
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I managed to stumble across the Axiom Versalock long hardware kit (280mm long version not advertised on website; link is for standard version).

    Worked perfectly out of the bag, and I feel very comfortable putting my kid on the child seat.

    DSC_6083..jpg

    --

    edit: I needed to widen two of the extender holes on the rack with a 15/64 inch drill bit to accomodate the M6 screws
    Last edited by dchsueh; 09-02-10 at 11:41 AM. Reason: added mounting information

  9. #9
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    549
    Mentioned
    31 Post(s)
    Tagged
    0 Thread(s)
    Long rack mounting struts the stainless steel strips with the end twisted 90 degrees, can be readily bent,
    and should work fine ..

    but as above post shows getting a whole different rack is a better stimulation of the consumer economy..

  10. #10
    Senior Member
    Join Date
    May 2010
    Location
    Toronto, ON area
    My Bikes
    2010 Globe Live 2
    Posts
    72
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    To clarify, I did not buy a new rack; I managed to find really strong extenders to mount the original discussed EX-1 necessary to mount CoPilot seats. (The MEC clone rack will not work; PM me if you are interested why.)

    I posted a follow-up in case people were interested.

Posting Permissions

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