Advertise on Bikeforums.net



User Tag List

Results 1 to 14 of 14
  1. #1
    Senior Member MrCjolsen's Avatar
    Join Date
    Nov 2004
    Location
    Davis CA
    My Bikes
    Surly Cross-Check, '85 Giant road bike (unrecogizable fixed-gear conversion
    Posts
    3,954
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Does moving your wheel change the bikes geometry?

    When you have horizontal dropouts?

    When I flip my rear wheel, I go from a 15t cog to a 17t cog. With the horizontal campy dropouts I have, I know it raises the rear wheel slightly.

    However, is this enough to be felt and warrant an adjustment of my bars or saddle? Anyone else have experience with this?

  2. #2
    stay free. frankstoneline's Avatar
    Join Date
    Dec 2007
    Location
    Ellensburg, WA
    My Bikes
    EAI Bare Knuckle, 1980's Ross Signature 292s 12 speed
    Posts
    1,557
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    No, the point where the force of your wheel is applied is where the dropouts join the rear triangle as far as I know, so changing wheel placement in the dropouts shouldnt change geometry, and evev if it does, it will be minimal. I wouldnt worry about it.
    xoxo David
    Quote Originally Posted by metaljim View Post
    katana's out frank! always be ready.
    <edited>

  3. #3
    70mm4$!n! freeskihp's Avatar
    Join Date
    Aug 2006
    Location
    DC
    My Bikes
    Sworks E5, ritte Bosberg
    Posts
    1,757
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    if you have to ask online and you can't feel it than it doesn't matter
    "The only reasons anyone should ever ride in the rain is because a) youíve had your license to operate a motor vehicle suspended by the state. b) youíre in a bike race in which case youíre not allowed to use fenders anyway. c) youíre from Portland- in which case my main problem is with your neck beard- not your bicycle...If you need to train when itís pissing rain- buy a trainer or one of those cheap charter flights to Mallorca."

  4. #4
    Perineal Pressurized dobber's Avatar
    Join Date
    Oct 2003
    Location
    In Ebritated
    Posts
    6,556
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    No.
    This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.

  5. #5
    Senior Member
    Join Date
    Aug 2007
    Location
    Minneapolis, MN
    My Bikes
    Surly CrossCheck, Miyata 310 (conversion)
    Posts
    854
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ^^^^

    Yes it would change the wheelbase of the bike, due to using the same chain length, when you switch from 15 Tooth to 17 Tooth (larger diameter), all it would do is move your wheel forward by what ever fraction of an inch of the difference in the diameters of the two cogs.

    Nominal differences really, you shouldn't notice a thing.
    derailleur? I hardly know her
    http://a2bikegeek.wordpress.com/

  6. #6
    Senior Member
    Join Date
    Jun 2007
    Location
    four 1 OHHH , Maryland
    My Bikes
    nagasawa, fuji track pro
    Posts
    2,588
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    why does the rear wheel raise? i don't get what u mean by that, because if it's horozontal then it should be shifting laterally.

  7. #7
    Balls exhibitx's Avatar
    Join Date
    Jul 2007
    Location
    Toronto
    Posts
    678
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    most horizontal drops aren't completely level, infact i've never seen them level ... track drops are usually level

  8. #8
    moving target c0urt's Avatar
    Join Date
    Oct 2006
    Location
    birmingham, al
    My Bikes
    a masi speciale, and a kuota k-factor.
    Posts
    2,831
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    from what i have read, the back wheel is minimal. when you start changing the front wheel is when big things happen
    how to tape your bars http://www.flickr.com/photos/89572419@N00/sets/72157629279270681/

  9. #9
    :)
    Join Date
    Nov 2006
    Location
    duluth
    My Bikes
    '07 Pista, '09 Fantom Cross Uno, '8? Miyata, '67 Stingray, '0? Zoo mod trials, Tallbike, Chopper, '73 Schwinn Collegiate, '67 Triumph Chopper, '69 CB350, '58 BSA Spitfire, '73 CB450
    Posts
    3,391
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It totally matters! Even a couple miles of riding a flipped wheel without a professional resetting of your bars, seat, and a possible stem swap could lead to a critical geometry failure!








    j/k yer fine.

  10. #10
    Senior Member
    Join Date
    Aug 2007
    Location
    Minneapolis, MN
    My Bikes
    Surly CrossCheck, Miyata 310 (conversion)
    Posts
    854
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ^^^^

    man that would suck to have happen. That frame AU ?
    derailleur? I hardly know her
    http://a2bikegeek.wordpress.com/

  11. #11
    :)
    Join Date
    Nov 2006
    Location
    duluth
    My Bikes
    '07 Pista, '09 Fantom Cross Uno, '8? Miyata, '67 Stingray, '0? Zoo mod trials, Tallbike, Chopper, '73 Schwinn Collegiate, '67 Triumph Chopper, '69 CB350, '58 BSA Spitfire, '73 CB450
    Posts
    3,391
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Metricoclock View Post
    ^^^^

    man that would suck to have happen. That frame AU ?
    Donno, random google image of "bike hit by car"

  12. #12
    Al noisebeam's Avatar
    Join Date
    Jun 2004
    Location
    AZ
    My Bikes
    Cannondale SuperSix, Lemond Poprad. Retired: Jamis Sputnik, Centurion LeMans Fixed, Diamond Back ascent ex
    Posts
    13,916
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    When use 15 let 15psi out front tire. when back to 17 let 15psi out back tire

  13. #13
    Perineal Pressurized dobber's Avatar
    Join Date
    Oct 2003
    Location
    In Ebritated
    Posts
    6,556
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Metricoclock View Post
    ^^^^

    Yes it would change the wheelbase of the bike, due to using the same chain length, when you switch from 15 Tooth to 17 Tooth (larger diameter), all it would do is move your wheel forward by what ever fraction of an inch of the difference in the diameters of the two cogs.
    He didn't ask about geometry, he asked whether the change would affect handlebar and saddle placement.

    Quote Originally Posted by The other guy asked
    why does the rear wheel raise? i don't get what u mean by that, because if it's horozontal then it should be shifting laterally.
    The horizontal drop outs typically have a slight angular alignment such that repositioning the wheel does not affect the relationship between rim and brakes.
    This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.

  14. #14
    70mm4$!n! freeskihp's Avatar
    Join Date
    Aug 2006
    Location
    DC
    My Bikes
    Sworks E5, ritte Bosberg
    Posts
    1,757
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by dobber View Post
    He didn't ask about geometry, he asked whether the change would affect handlebar and saddle placement.
    Check the thread title again chief
    "The only reasons anyone should ever ride in the rain is because a) youíve had your license to operate a motor vehicle suspended by the state. b) youíre in a bike race in which case youíre not allowed to use fenders anyway. c) youíre from Portland- in which case my main problem is with your neck beard- not your bicycle...If you need to train when itís pissing rain- buy a trainer or one of those cheap charter flights to Mallorca."

Posting Permissions

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