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  1. #1
    Larger Chainring Oregon Southpaw's Avatar
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    New Crank or New Cassette?

    Hi guys,

    I am currently running a bike that has 52/42 chainrings, 6 speed. I live in Oregon and love climbing, but I do find I run out of spinnable gears on some of the wicked uphills. Freewheel on the rear hub.

    My gut reaction was to just throw a 39t chainring on but I have been told that my crank (Sugino Super Mighty) will take 41t at the smallest, and those aren't easy to track down (or worthwhile).

    I'm running friction with a Cyclone FD and a Sprint 9000 (index-capable) RD.

    So I'm looking for the cheapest way to go. I've got access to all the tools I would need and some capable help at the bike co-op down the street.

    Would the 42t -> 39t change be worth it? I'm looking at some really cheap 144BCD cranks online as we speak. I felt like I had all the gears I'd ever need on my dad's 7sp 52/39, but then again, that was Indiana where there is no climbing.
    Quote Originally Posted by Dovetube View Post
    At times my crotch has thought the title to this thread.

  2. #2
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    Sounds like you are riding some vintage steel there.

    I get by with a 42/53 and a 14-28 for hill climbing and would be loathe to swap my Sugino Mighty for some characterless modern crank...

    What is the gear range on your freewheel now ?

  3. #3
    Larger Chainring Oregon Southpaw's Avatar
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    14-24

    As this is neither C&V nor the Road Cycling forum, I'll ignore any HTFU comments since I spent a whole season doing that...

    Looking for some crank pictures while we're at it
    Quote Originally Posted by Dovetube View Post
    At times my crotch has thought the title to this thread.

  4. #4
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    Some options:

    Swap in a 6 speed megarange that has a 14 - 15 - 18 - 21 - 24 - 34 or pony up $50.00 for an IRC with a 13 - 15 - 18 - 21 - 24 - 32 or consider an upgrade to a 7 speed with a Shimano 14 - 16 - 18 - 20 - 22 - 24 - 34 or the IRC 7 speed with a 13 - 15 - 18 - 21 - 24 - 28 - 32.

    Your rear d will need to be able to handle the larger rear cogs and with a 7 speed upgrade you may need a spacing washer on the drive side... with a steel frame you can add a matching washer on the non drive and avoid having to re dish the wheel and it should still fit quite nicely.

    The 7 speed is a little tighter across it's top 6 speeds with 2 tooth jumps which can help with maintaining cadence and avoids bigger jumps in gearing.

    I use an 8 speed mega cassette on my touring bike... it makes for smoother shifting across the main 7 and I have a 34 there when things are pointing straight up.

  5. #5
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    Quote Originally Posted by Oregon Southpaw View Post
    14-24

    As this is neither C&V nor the Road Cycling forum, I'll ignore any HTFU comments since I spent a whole season doing that...

    Looking for some crank pictures while we're at it
    Try a 14-28 and see how that goes... with a 42/52 and a 14-28 you have a gear range similar to a compact but lose a little off the top.

    My set up for climbing... love those vintage Sugino cranks.


  6. #6
    Larger Chainring Oregon Southpaw's Avatar
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    Thank you Sixty Fiver, for options to consider. Those seem like valid options, and like you mentioned earlier, I don't think my friends would like me anymore if I swapped out the crank since they ask about buying it on a weekly basis.

    Sad, but this is the only good picture I have of it
    7834_676395256528_20720392_40291648_5247966_n.jpg
    Quote Originally Posted by Dovetube View Post
    At times my crotch has thought the title to this thread.

  7. #7
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Oregon Southpaw View Post
    Thank you Sixty Fiver, for options to consider. Those seem like valid options, and like you mentioned earlier, I don't think my friends would like me anymore if I swapped out the crank since they ask about buying it on a weekly basis.

    Sad, but this is the only good picture I have of it
    7834_676395256528_20720392_40291648_5247966_n.jpg
    Yeah, that crank is 144mm bolt pattern, which means 42 tooth is a small as you go (41, as you've found, is really rare.)

    The perfect swap for you would be an old set of Sugino Mighty Tour cranks, with a 38/52 double or even a 34/46/52 triple. Sadly, finding Mighty Tour cranks seems pretty tough. I found a set of arms on Ebay, but you'd have to get some 110mm rings to make 'em work.

    I have a set of NOS Mighty Tour arms in my collection, but I'm not letting them go, no way.

    Here's the modern version:
    http://www.suginoltd.co.jp/english/p...er_english.htm
    Jeff Wills

    All my bikes.

  8. #8
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    Quote Originally Posted by Oregon Southpaw View Post
    Thank you Sixty Fiver, for options to consider. Those seem like valid options, and like you mentioned earlier, I don't think my friends would like me anymore if I swapped out the crank since they ask about buying it on a weekly basis.
    I have gotten a few offers for my Mighty as well... they are dead sexy and very well made cranks.

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