Advertise on Bikeforums.net



User Tag List

Results 1 to 11 of 11
  1. #1
    PMK
    PMK is offline
    Senior Member PMK's Avatar
    Join Date
    May 2008
    Location
    Royal Palm Beach, Florida
    My Bikes
    2006 Co-Motion Roadster (Flat Bars, Discs, Carbon Fork), Some 1/2 bikes and a couple of KTM's
    Posts
    1,083
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Right or wrong we like it.

    When we recently bought this Speedster it was advertised as a medium 2002, but turned out being a 2000 model and a small. After some digging through the vintage parts boxes, I wound up building what seems to be a hot rod hybrid speedster.

    Most important thing is the wife / stoker is comfy, and we're pretty close. Being a MTB girl with no road experience, this has been a good compromise. With bar ends it's good for me too.

    So for now this will be how this one rolls.

    FWIW, I did go with downtube shifters, and just yesterday modified an adjustable 1 1/8 cheapy stem by boring it to 29.8. This made me feel better knowing that chrome tube of the Co-Mo adjustable stoker stem was gone, and not there to inflict injury in mounting or if we were to drop it.

    So from our original buy, we are using the frame, seatposts, captains saddle, wheels / tires, chains, cranks, BB's, brakes and derailuers.

    The changes included going with flat bars with bar ends, XT V brake levers, downtube shifters, rack, lights, Terry for the stoker and SPD 747's.

    The bike rolls fast, rides smooth, and is comfortable plus fun.

    So please don't tar and feather me for building what seems like a Corvette, with an Impala body.

    After seeing the recent ebay White Cannondale with Aerospokes and flat bars, I didn't feel quite as guilty.

    Thanks to everyone that offered advice, either from current or old posts.

    Jeanne and Paul
    Attached Images Attached Images
    Last edited by PMK; 11-23-08 at 11:56 AM.

  2. #2
    Senior Member zonatandem's Avatar
    Join Date
    Dec 2003
    Location
    Tucson, AZ
    My Bikes
    ariZona carbon fiber tandem & single
    Posts
    9,968
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Enjoy the ride TWOgether!

  3. #3
    Senior Member
    Join Date
    Nov 2006
    Location
    Lafayette, Colorado
    My Bikes
    1998 Co-Motion Co-Pilot
    Posts
    577
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My only concern would be with the stem. Boring out a stem - even a little bit - could weaken it significantly. This could be very dangerous in either position. You might be OK but it could break unexpectedly at any time - soon or in the distant future. If it is going to break, it will break when under the most stress.

    Be very sure this modification is OK.

    I doubt that many on this forum are concerned with how your ride looks if it suits you.

    Good luck & have fun.

  4. #4
    Gear Combo Guru Chris_W's Avatar
    Join Date
    May 2007
    Location
    Switzerland
    My Bikes
    Spec' Tarmac (road), Spec' Secteur Disc (commuter & tourer), Salsa Mamasita (MTB), CoMo Speedster (tandem), Surly Big Dummy (cargo), Airnimal (folder), a train pass, and NO car :)
    Posts
    2,046
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm all for customization, and not worrying would someone else might say based on aesthetics. However, I have to agree with oldacura - the bored out rear stem is very worrying. I would have kept the stem you like as it was, then found a seat post that fitted the stem without any modification, then used a shim to make the new seat post fit in the frame correctly. Anyway, enjoy the riding, it can be even more enjoyable when you have it dialed in just right for you both.

  5. #5
    Senior Member
    Join Date
    Mar 2007
    Location
    Charleston, WV
    My Bikes
    Trek Mountaineer modified with a NuVinci; Montegue Paratrooper folding mountain bike; Greenspeed recumbent; Surly Big Dummy with Stokemonkey
    Posts
    1,768
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    As long as you're happy, that's all that matters.

  6. #6
    PMK
    PMK is offline
    Senior Member PMK's Avatar
    Join Date
    May 2008
    Location
    Royal Palm Beach, Florida
    My Bikes
    2006 Co-Motion Roadster (Flat Bars, Discs, Carbon Fork), Some 1/2 bikes and a couple of KTM's
    Posts
    1,083
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by zonatandem View Post
    Enjoy the ride TWOgether!
    We will and do.

    Thanks
    PK

  7. #7
    PMK
    PMK is offline
    Senior Member PMK's Avatar
    Join Date
    May 2008
    Location
    Royal Palm Beach, Florida
    My Bikes
    2006 Co-Motion Roadster (Flat Bars, Discs, Carbon Fork), Some 1/2 bikes and a couple of KTM's
    Posts
    1,083
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Guys, I agree that boring the stem may not be ideal. I spent a while looking for a 1 1/4" stem of appropriate length and angle, non were found as of yet. I'll keep an eye open for one.

    In regards to boring this stem I used, it was resized from a 28.6 to a 29.8 mm ID., which removed .6mm (.0236") from the wall thickness. In the major support areas this was about 10% of the available wall thickness, in the reduced areas it was closer to 15%. I plan to keep an eye, and eddy current inspection on it.

    I'm still optimistic, a non adjustable 1 1/4 stem will Ebay for me to find. Just a waiting game being careful while we wait.

    PK

  8. #8
    PMK
    PMK is offline
    Senior Member PMK's Avatar
    Join Date
    May 2008
    Location
    Royal Palm Beach, Florida
    My Bikes
    2006 Co-Motion Roadster (Flat Bars, Discs, Carbon Fork), Some 1/2 bikes and a couple of KTM's
    Posts
    1,083
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    We don't mind the hybrid look, just odd posting about a hybrid on a road oriented site.

    FWIW, the look of the bike is not bad, it does slice the middle between road and mountain. This site is more road oriented, which is this bikes origins. Getting the wife on paved surfaces has been a new first step. The position and feel for her, riding with flat bars is making the transition easier.

    With each year that passes, her allergies and asthma seem to get worse. This was a big factor in me wanting the tandem mtb. As ZonaTandem always says ride twogether, and this makes that happen, with no guilt just pure fun.

    The Co-Motion was decided so as to allow us to ride twogether after work in these short daylight months. Where we live there are some parks with miles of paved winding bike paths. With lights we can ride for a couple of hours a few times a week.

    By riding less in the woods her breathing doesn't get as fouled up, and we are able to ride more.

    With luck, and a puffer, hopefully we will be riding MTB's till we can't. It is something we truly enjoy, be it on our singles or more so on the tandem MTB.

    As for this road and paved riding, she is starting to enjoy each ride more, be it for training, to go to dinner or for groceries.

    She knows, but won't admit knowing that ultimately we will get a drop bar tandem. We were eyeing the 2009 C'Dale RT2, then this Speedster came along. Granted it was not exactly perfect when we got it, but so far it's been fine and is getting better with each small adjustment.

    One other goal we may set, and we are finding out more details, is Team in Training. In the last few months our 16 year old nephew was diagnosed with stage 4 Lukemia. If our participation can help in some way, we will likely focus some attention in that direction also.

    So thanks for the kind words about our Hot Rod Hybrid Speedster, and I will keep a close watch on the stem.

    Thanks
    Riding Twogether
    JK&PK

  9. #9
    Senior Member
    Join Date
    Oct 2008
    Posts
    242
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    How will you be performing regular eddy current inspections? Do you have the equipment? As a level 2 UT inspector I find this an odd statement to make....

  10. #10
    PMK
    PMK is offline
    Senior Member PMK's Avatar
    Join Date
    May 2008
    Location
    Royal Palm Beach, Florida
    My Bikes
    2006 Co-Motion Roadster (Flat Bars, Discs, Carbon Fork), Some 1/2 bikes and a couple of KTM's
    Posts
    1,083
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Smokinapankake View Post
    How will you be performing regular eddy current inspections? Do you have the equipment? As a level 2 UT inspector I find this an odd statement to make....

    Plan was to fire up the Hocking, and scan the modified section. If you have access to the equipment and know how to utilize it, well, checking bicycle frames or parts is fairly easy, sometimes scary too.

    As a non current level II, I find it a lazy way to get good results with no fuss.

    PK
    2006 Co-Motion Roadster, flat bars, discs and carbon fibre fork, size 22 / 19
    2006 Ventana ECDM full suspension mountain tandem
    Some single bikes and a couple of KTM's
    And most important, someone special that enjoys them with me (except the KTM's)

  11. #11
    Senior Member zonatandem's Avatar
    Join Date
    Dec 2003
    Location
    Tucson, AZ
    My Bikes
    ariZona carbon fiber tandem & single
    Posts
    9,968
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    As for PMK stoker's breathing/allegy/asthma issue, have you considered moving to a less humid climate?
    We moved to the drier state of AZ from MI over 30 years ago due to spouse's family history of arthritis. Was a great/beneficial move for us. Now in our mid-70s we are still doing great.
    Nice conversion to a semi-hybrid . . . whatever floats your boat!
    This is a tandem forum, so you-2 fit right in!
    Pedal on TWOgethert!
    Rudy and Kay/zonatandem

Posting Permissions

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