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  1. #1
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    One question about free wheels

    HI,
    I have a centurion ironman 1986, I wonder what was the gear ratio for that model bike it has freewheel gear, and I may need to replace the freewheel do to excessive hopping and wear to chain and cogs.
    I ve had the axle cleaned and degreased derailer, lubed cables, and it stil dosent like the larger gears works best in the smallest or 6th gear.
    I ordered a NAshbar 6 spd gear for it, but I am alitttle worried about gear size changes with such a small number of gears. My LBS said get the lowest ratio I can, avoid the MTB gears their not needed on a bike that will be ridden mostly on flat land.
    Doug

    her's the ratio I ordered. Quote:
    ((Modern shift ramps and machined teeth in a classic SIS compatible freewheel, all at one great price, what more can you ask for! Use standard Park FR-1 freewheel tool for installation/removal. Choose from 14-24 (14,16,18,20,22,24) ))

  2. #2
    Senior Member
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    Not sure of the question. I'd think 14/24 would work on most anything, even 14/28 if you need to go a little lower. Range of freewheel is determined by type of rear derailler and difference between chainrings in front.

  3. #3
    "Purgatory Central" Wino Ryder's Avatar
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    Quote Originally Posted by djnzlab1 View Post

    her's the ratio I ordered. Quote:
    ((Modern shift ramps and machined teeth in a classic SIS compatible freewheel, all at one great price, what more can you ask for! Use standard Park FR-1 freewheel tool for installation/removal. Choose from 14-24 (14,16,18,20,22,24) ))



    Actually thats a decent ratio spread in a 6-speed, riding mostly flat land. I have an '85 Centurion 6-speed that I converted to 7-speed with the same ratio spread as yours, but with a 28t low gear over the 24. Works great for me.
    ~ "I like the way the brake cables come out of the top of the levers and loop around to the brake calipers!...I like those downtube shifters too!...No no no, don't take 'em off, don't take 'em off,...leave 'em on, leave 'em on! - Thats right baby!!

    ~BF - Steel Club Member #00051

  4. #4
    My bikes became Vintage OLDYELLR's Avatar
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    Quote Originally Posted by djnzlab1 View Post
    14,16,18,20,22,24
    The teeth increase by 2 for each cog. That does not give you a very good percentage progression through the gears. I.e., the step between the 14 and 16 (14%) is much bigger than the step between the 22 and 24 (9%) and you will feel it. Usually you would expect a 1-tooth difference in the smallest cogs and a larger difference in the larger ones.
    1981 Nishiki Ultimate
    1977 Nishiki Landau
    1967 Jeunet Captivante track bike
    1951 Claud Butler New Allrounder under construction
    "index shifters = frets on a fiddle"

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