Cassette gearing for high speed flat riding
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  1. #1
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    Cassette gearing for high speed flat riding

    Hey guys, I just ordered a new bike (17' giant propel) which comes with Shimano Ultegra 11x28 and wondering if that would be ideal for riding at 26-31mph on the flats with zero climbing (south Florida a1a)

    A buddy of mine recently got a 17' dogma f8 with an ultra cassette as well however his gears appear to be a bit smaller and have less of a jump in size going gear to gear however his gearing is unknown.

    thanks!

  2. #2
    hfc
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    11-21, if it's 11 speed I believe 11-23 is as corn cob as it gets.

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    Quote Originally Posted by hfc View Post
    11-21, if it's 11 speed I believe 11-23 is as corn cob as it gets.

    Awesome, thanks! 11x23 it is.

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    while am at it, would you replace the 36/52 crank with more teeth? 53/39?

  5. #5
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    Quote Originally Posted by illlili View Post
    while am at it, would you replace the 36/52 crank with more teeth? 53/39?
    A 52/11 @ 100 rpm is going to get you 37 mph, I don't think you're going to need the 53
    If you try to fail, and succeed, which have you done?

  6. #6
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    Quote Originally Posted by redondoaveb View Post
    A 52/11 @ 100 rpm is going to get you 37 mph, I don't think you're going to need the 53
    .....and if you do, I will declare you "hors catagorie', and enter you into next year's TdF....
    "L'enfer, c'est les autres"

  7. #7
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    If you're going that fast why bother changing the cassette? You'll be in the 11/12/13/14 either way. You're wasting money.
    I work for some bike racers
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    Quote Originally Posted by cxwrench View Post
    If you're going that fast why bother changing the cassette? You'll be in the 11/12/13/14 either way. You're wasting money.
    Yeah, you can get a four cog cassette, think how much weight you'll save.
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  9. #9
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    11-23 and block out the 11, 12, and 13.....A 14x52 will take you into the low 30's.
    If your opinion differs from mine, ..........Too bad.
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  10. #10
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    Quote Originally Posted by redondoaveb View Post
    Yeah, you can get a four cog cassette, think how much weight you'll save.
    Oh no he can't, he can't live without his 16~
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  11. #11
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    Quote Originally Posted by duriel View Post
    Oh no he can't, he can't live without his 16~
    You know I'm the only one with a 16.
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  12. #12
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    Well we were talking cassettes today up the mountain, so I did a little research when I got home & dang if I don't have a 16 on my 11-32. But I never know when I'm in it, but it is only for 5% of the time I am sure!~
    I think I was in the 28 75% of the time going up & the 12 most the way down, which would be about 25% of the time.
    But my Seven don't have one, I know that for a fact!
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    Quote Originally Posted by cxwrench View Post
    If you're going that fast why bother changing the cassette? You'll be in the 11/12/13/14 either way. You're wasting money.
    Sure, use the 15, 16, 17 for tempo riding; keep the 20, 23, 26, 28, for the highway overpasses.

  14. #14
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    You could build one of these on a modern cassette using the appropriate 11 tooth gear.

    polecogL.jpg

    17t x 17t cogset
    Too old to ride plastic

  15. #15
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    If I were you I'd replace the crank with 39/53 and the cassette with 11-23. Actually that's the gearing I have on my bike and the only gearing I've ever had since getting into road bikes in '96. I won the Mt. Washington hill climb on that gearing so it'll get you over a few overpasses.

    The point of it though is to have small steps between gears, the larger chainring lets you use a larger cog in back for less friction and longer wear, and the tall gears let you slow down your cadence and rest.

  16. #16
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    Is there wind? However I do not know what kind of cassette you should get other then whatever is the most corn cob available. .

    I would probably just get a fixie. Maybe the Specialized Langster for $600.00.

  17. #17
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    So here we have someone who rides around at 26-31 MPH getting advice from a guy who won Mt. Washington with 39x23 as the easiest gear.
    Gotta love the internet.

  18. #18
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    '17 ... 2017

    17' ... 17 ft
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    thanks for all the replies guys. got both a new crank and cassette on the way. https://youtu.be/ZCX-cuWJobE gotta love flat south Florida a1a riding.

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    Quote Originally Posted by blackfrancois View Post
    '17 ... 2017

    17' ... 17 ft
    I just thought he was pretty tall.
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  22. #22
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    Quote Originally Posted by Fredrico View Post
    Sure, use the 15, 16, 17 for tempo riding; keep the 20, 23, 26, 28, for the highway overpasses.

    ^ So much this.

  23. #23
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    11-23: 11-12-13-14-15-16-17-18-19-21-23
    11-25: 11-12-13-14-15-16-17-19-21-23-25 -- This drops the 18 and adds the 25.

    Here's Mike Sherman's Gear calculator with the 11-23 and 36-52 settings. You can bookmark the URL to recall those settings later.

    The charts update on the fly as you change cadences or gearing.


    Your current 11-28 cassette at high racing cadences:
    11-28 and 36-52.JPG

    And the 11-23 at the same cadences:
    11-23 and 36-52.JPG

    With the 18 and 16 cogs added, you get better, closer shifts in the 20-25 mph range. Your current cassette already has the 11,12,13,14,15, same as the 11-23, so your 25-30 mph cadences won't change.

    Yes,
    Quote Originally Posted by cxwrench View Post
    If you're going that fast why bother changing the cassette? You'll be in the 11/12/13/14 either way. You're wasting money.
    That video link was impressive, a lot of 25-30mph riding. But you'll have windy days or slower speeds and will still use the rest of the cassette.
    Last edited by rm -rf; 12-24-2016 at 08:54 PM.

  24. #24
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    Quote Originally Posted by rm -rf View Post
    11-23: 11-12-13-14-15-16-17-18-19-21-23
    11-25: 11-12-13-14-15-16-17-19-21-23-25 -- This drops the 18 and adds the 25.

    Here's Mike Sherman's Gear calculator with the 11-23 and 36-52 settings. You can bookmark the URL to recall those settings later.

    The charts update on the fly as you change cadences or gearing.


    Your current 11-28 cassette at high racing cadences:
    11-28 and 36-52.JPG

    And the 11-23 at the same cadences:
    11-23 and 36-52.JPG

    With the 18 and 16 cogs added, you get better, closer shifts in the 20-25 mph range. Your current cassette already has the 11,12,13,14,15, same as the 11-23, so your 25-30 mph cadences won't change.

    Yes,


    That video link was impressive, a lot of 25-30mph riding. But you'll have windy days or slower speeds and will still use the rest of the cassette.
    Above chart illustrates it well. The top red steps has a gap between the 17 and 15 and the 17 and 19, that gets filled in by the 16 and 18 on the 11-23 cluster. These gears are in the range 15-20 mph, the speeds rider will be going most of the time "tempo-ing" on the flats, training the aerobic system below AT. I wouldn't want to give them up.

    The 28 wouldn't get used much. All grades could be handled in the 21 or 23 at typical climbing cadences, which would be around 60-70 rpm at typical climbing speeds, 6-12 mph. Rider could probably spin up those overpasses at 90 rpm in the 23, going 11-12 mph, easy.
    Last edited by Fredrico; 12-24-2016 at 09:20 PM.

  25. #25
    coaster
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    Quote Originally Posted by Jay Strongbow View Post
    So here we have someone who rides around at 26-31 MPH getting advice from a guy who won Mt. Washington with 39x23 as the easiest gear.
    Gotta love the internet.
    P.S. Junior class. Tyler Hamilton won the overall that year. I think he had the same gearing.

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