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  1. #1
    No Crybabies
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    Top speed on fixie?

    What's your top speed on a fixed gear? I suppose the trackies will beat out all of us road fixie riders, as they don't have to climb hills (well, maybe short ones).

    Speed, gears, rpms?

    39 mph
    70 inches (47x18)
    189 rpms (backed off just short of complete disintegration)

    Down hill, of course.
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  2. #2
    Moderatus Puisne
    Reputation: Argentius's Avatar
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    12 pounds.

    No, wait...

  3. #3
    Frog Whisperer
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    my gps showed max of 34 with a 48/18 and I have NO idea how many RPM because at those spin-speeds I was not looking at the "dash"
    Of course I'm sure...that doesn't mean I'm right......

  4. #4
    Frog Whisperer
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    thanks...i don't do math........

    I have spun up at 193 on the trainer......but on the road.......nope....not going there....
    Of course I'm sure...that doesn't mean I'm right......

  5. #5
    No Crybabies
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    math

    Quote Originally Posted by Touch0Gray
    my gps showed max of 34 with a 48/18 and I have NO idea how many RPM because at those spin-speeds I was not looking at the "dash"
    It's just math. 48x18 at 34 mph = 161 rpms.

    http://www.midcalracing.com/gears.xls
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    When my fist clenches, crack it open
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  6. #6
    No Crybabies
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    oh, it's fun

    Quote Originally Posted by Touch0Gray
    thanks...i don't do math........

    I have spun up at 193 on the trainer......but on the road.......nope....not going there....
    Oh, it can be fun to find out how fast is "too fast." Everything seems fine, then all the sudden at some unpredictable rpm it's like your legs turn to rubber and the whole bike starts bouncing around like you're riding down rail road ties. Very entertaining.

    Mr. Excel does my math, by the way.
    [SIGPIC][/SIGPIC]

    When my fist clenches, crack it open
    Before I use it and lose my cool
    When I smile, tell me some bad news
    Before I laugh and act like a fool

  7. #7
    Frog Whisperer
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    I saved the .xls.......from now on I'll know ......I still don't DO the math.....

    I really have NO idea how fast I have gone on fixed....at those rpm I really am NOT looking at anything but the road.......the faster I pedal, the harder i try to stay on top of it because I do NOT like the feel of the bike DRIVING me.....................

    FWIW I have both front and rear brakes and am NOT afraid to use them!
    Of course I'm sure...that doesn't mean I'm right......

  8. #8
    Baltic Scum
    Reputation: seeborough's Avatar
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    A couple of days ago, on the flats, I hit 32.5 mph with with a 49/18 and was mighty proud of myself.
    But 189 rpm? Dayummm!
    Chapeau, mon frere.
    Last edited by seeborough; 12-14-2008 at 04:43 PM.
    Was juckt es die stolze Eiche, wenn sich ein Schwein an ihr kratzt?

  9. #9
    RoadBikeReview Member
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    Best so far for me is 36.6 mph with 46x17 (approximately 71.5 gear inches) gearing downhill of course and felt like if it was longer could have gone faster without much problem. I'm guessing I would top out somewhere around 40 mph with this gearing.

    Longest sustained speeds with the same gearing on a group ride, I've followed the group slowly accelerating from 24mph - 29mph over approximately 1.5 miles, then finished with a 33-34 mph sprint up a slight hill (our normal sign sprint) for approx. 200 meters or so.
    Bikes:
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  10. #10
    Old and Fixed, Moderator
    Reputation: Dave Hickey's Avatar
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    Quote Originally Posted by Fixed
    Oh, it can be fun to find out how fast is "too fast." Everything seems fine, then all the sudden at some unpredictable rpm it's like your legs turn to rubber and the whole bike starts bouncing around like you're riding down rail road ties. Very entertaining.
    .
    you are a sick man Doug...
    Dave Hickey/ Fort Worth

    My 3Rensho Blog: http://vintage3rensholove.blogspot.com/

  11. #11
    Eat Fast. Die fat.
    Reputation: Hagakure's Avatar
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    39.95 Mph
    If you can't fix it with a hammer, you have yourself an electrical problem.

  12. #12
    Frog Whisperer
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    Quote Originally Posted by Dave Hickey
    you are a sick man Doug...
    SERIOUSLY SICK........I like my heart rate up because I am working hard, not because I am scared I am going to die!
    Of course I'm sure...that doesn't mean I'm right......

  13. #13
    jaded bitter joy crusher
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    Quote Originally Posted by Argentius
    12 pounds.

    No, wait...
    Is that an English or Italian bottom bracket?
    Fredke commented in your thread. You won't believe what happens next!

  14. #14
    jaded bitter joy crusher
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    Quote Originally Posted by Touch0Gray
    SERIOUSLY SICK........I like my heart rate up because I am working hard, not because I am scared I am going to die!
    For high heart-rate, fast cadence has nothing over dropping your chain on a downhill.
    Fredke commented in your thread. You won't believe what happens next!

  15. #15
    hello
    Reputation: roadfix's Avatar
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    I guess about 25.

  16. #16
    No Crybabies
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    jaded

    Quote Originally Posted by Touch0Gray
    SERIOUSLY SICK........I like my heart rate up because I am working hard, not because I am scared I am going to die!
    I guess I'm just jaded. We have ginormous hills around here, and since we're doing it all the time, you just get used to it. I do think that 39 mph on the fixed was much scarier than when I put on my 67 tooth chainring on my timetrial bike and passed cars at 57 mph, averaging 50 mph for 8.5 miles.
    [SIGPIC][/SIGPIC]

    When my fist clenches, crack it open
    Before I use it and lose my cool
    When I smile, tell me some bad news
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  17. #17
    Carbon Fiber = Explode!
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    32 mph on a flat. 42*14
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    1 hour of running = 1 hour of wasted time when you could have been riding. - Alaska Mike

  18. #18
    RoadBikeReview Member
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    This is pretty illuminating. I've hit 56 mph on a SS coastie, but top speeds on fixies seem to be under 40 (mine very much included). I guess I never thought that much about the speed difference; I wonder how much time you'd shave on a given route by coasting? Probably not much, since the downhills are always the shortest part of the ride, but I'm sure there's a difference.

  19. #19
    RoadBikeReview Member
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    Are y'all riding fixed gear bikes with the little computers on the bars? or you calculating these speeds by gearing and cadence. Riding a fixed gear with a little cateye or whatever sounds like a good topic for bikesnobnyc, from here!
    Waxahachie, Texas
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  20. #20
    Cat 6 rider
    Reputation: California L33's Avatar
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    Quote Originally Posted by Touch0Gray
    thanks...i don't do math........

    I have spun up at 193 on the trainer......but on the road.......nope....not going there....
    I'm not sure what the red line is for the human ankle/knee/hip, but I'd guess you're getting pretty close to valve float there.
    To the troll mobile, away...

  21. #21
    duh...
    Reputation: FatTireFred's Avatar
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    Quote Originally Posted by David Loving
    Are y'all riding fixed gear bikes with the little computers on the bars? or you calculating these speeds by gearing and cadence. Riding a fixed gear with a little cateye or whatever sounds like a good topic for bikesnobnyc, from here!


    yeah, I don't even have a computer on my fg, and never bother to count cadence.

  22. #22
    Frog Whisperer
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    Quote Originally Posted by Fredke
    For high heart-rate, fast cadence has nothing over dropping your chain on a downhill.
    OR losing footing on a pedal. there is a reason I use clipless.......................................... ................................. (or your wife saying...honey...I'm pregna............................................ .................................................. .........
    Of course I'm sure...that doesn't mean I'm right......

  23. #23
    Frog Whisperer
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    Quote Originally Posted by California L33
    I'm not sure what the red line is for the human ankle/knee/hip, but I'd guess you're getting pretty close to valve float there.


    better than 3.44 x my age.......like I say...I ain't trying it on the road on purpose....
    Of course I'm sure...that doesn't mean I'm right......

  24. #24
    RoadBikeReview Member
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    Stand For Something.

  25. #25
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    Holy smokes...
    The road? Oh, I guess....

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