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  1. #1
    Have bike, will travel Barrettscv's Avatar
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    Will a Shimano SG G-26 granny gear fit on a 105 triple crank?

    I'm considering a 26 or 28t granny gear for my Shimano 105 Crankset. The crank now has 50, 39 & 30t chainrings. I'm using a 105 triple front derailluer and an Ultegra GS rear derailluer.

    I'm using a 10 speed chain.

    The SG G-26 is the correct 74 BCD, but is discribed as a MTB chainring: http://cgi.ebay.com/Shimano-SG-G-26-...92346847569163
    Last edited by Barrettscv; 06-24-10 at 01:30 PM.

  2. #2
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    Since the BCD matches, it should fit. It's likely listed as a MTB chainring simply because road bikes never come equipped with such a small chainring. Your deraillers should have no trouble handling that chainring swap either. I'm running a 52/42/28 triple on my commuter with the same deraillers (9 speed versions) with a 12/27 cassette.

  3. #3
    cycles per second Gonzo Bob's Avatar
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    "Fits most mountain bike cranks" ?1? 110/74 BCD cranks haven't been used much on mountain bikes for about 15 years!

    It'll fit. You may need a chain watcher to prevent the chain from falling off the inside on down shifts but then probably not since your middle ring is 39 and not 42 so the jump isn't so large.

  4. #4
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Barrettscv View Post
    I'm considering a 26 or 28t granny gear for my Shimano 105 Crankset. The crank now has 50, 39 & 30t chainrings. I'm using a 105 triple front derailluer and an Ultegra GS rear derailluer.

    I'm using a 10 speed chain.

    The SG G-26 is the correct 74 BCD, but is discribed as a MTB chainring: http://cgi.ebay.com/Shimano-SG-G-26-...92346847569163
    Yes. I have a variety of chainrings on my Ultegra crank:
    http://home.comcast.net/~jeff_wills/...-grr%20008.htm
    That's SR, a Shimano, and a Sugino rings on a Shimano crank. As long as the bolt circle matches, the rings don't care.
    Jeff Wills

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  5. #5
    Senior Member ClarkinHawaii's Avatar
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    This is the chain ring mentioned by OP.

    Why the strange-shaped attachment tabs, and why the 2nd set of holes?

    Also, it just says "steel"--Is that stainless, or is it going to rust like a chain, or does anybody know?
    Last edited by ClarkinHawaii; 06-25-10 at 12:04 PM.

  6. #6
    Senior Member ClarkinHawaii's Avatar
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    bump

  7. #7
    Senior Member
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    I can answer part of your question. Steel means steel. It will have a protective coating on it (similar to cassettes) but if left out in the elements long enough, it will rust. I had two steel chainrings on a bike that I frequently used at the beach for several years. I never had a rust problem on the chainrings.

  8. #8
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    It fits 2 different bolt patterns.74 and 58 or something.
    Everything should be as simple as possible...But not more so.---Albert Einstein

  9. #9
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    Quote Originally Posted by Booger1 View Post
    It fits 2 different bolt patterns.74 and 58 or something.
    Doubtful. Those inner holes are much too small for any chainring bolt that I've seen.

  10. #10
    Senior Member ClarkinHawaii's Avatar
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    Quote Originally Posted by joejack951 View Post
    Doubtful. Those inner holes are much too small for any chainring bolt that I've seen.
    Yeah, those inner holes just look too small for anything I can imagine. I asked the guy who's selling them on ebay--If and when he replies, I'll post the answer here.

    I have 2 105 triple cranksets that are crying out for something like this--and the cheapest steel I've been able to locate before today is Blackspire stainless, $30+. The way you describe this steel, apparently carbon steel, should work just fine for me; so I save $40 if i buy 2 of these.

    Thanks for the help!

  11. #11
    Senior Member ClarkinHawaii's Avatar
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    After giving this a lot of thought, I don't think this granny will work on a 105 triple crankset with external bottom bracket. Just eyeballing how far those tabs extend in toward the axle of the bb, it looks like they would hit the external bearings (Hollowtech II). On a square-taper bb they'd be fine.

  12. #12
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    Trim the tabs back and add a little black paint.

  13. #13
    Senior Member ClarkinHawaii's Avatar
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    Living in a small high-rise apartment, no way to trim. Take it somewhere to get it done, I've lost the price advantage. Not worth it.

    i heard back from the seller--Don't know Jack about Jack. Forget it.

  14. #14
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    Get a 24t small ring. It will work and you will have a very low gear when you need it. You can find them without the extra metal on the mounting tabs. I have put them on my friends bikes and on my RAAM rider's climbing bike.
    The shift from the smaller ring to the middle won't be smoothly indexed, but with practice it works fine.

  15. #15
    Senior Member ClarkinHawaii's Avatar
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    I already have, but aluminum.

    I'd like to replace with steel when the alum wears out.

  16. #16
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by ClarkinHawaii View Post
    This is the chain ring mentioned by OP.

    Why the strange-shaped attachment tabs, and why the 2nd set of holes?
    The inward-projecting tabs prevent a dropped chain from getting jammed between the frame and the chainring. Moot point now.

    If you're still looking, try to find an old SR Ninja chainring. Steel, silver, very, very durable. No inward chain de-jammers.
    Jeff Wills

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  17. #17
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    Quote Originally Posted by ClarkinHawaii View Post
    I already have, but aluminum.

    I'd like to replace with steel when the alum wears out.
    Unless you spend hours in the granny ring on a daily basis, you will never wear out the Al chainring.

  18. #18
    Senior Member ClarkinHawaii's Avatar
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    Quote Originally Posted by Jeff Wills View Post
    The inward-projecting tabs prevent a dropped chain from getting jammed between the frame and the chainring. Moot point now.

    If you're still looking, try to find an old SR Ninja chainring. Steel, silver, very, very durable. No inward chain de-jammers.
    Looking at Ninjas now. Thanks

  19. #19
    Senior Member ClarkinHawaii's Avatar
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    Quote Originally Posted by HillRider View Post
    Unless you spend hours in the granny ring on a daily basis, you will never wear out the Al chainring.
    You and opthers have told me this before; and you are probably correct. All I know is that I wince every time the chain falls ker-chunk from the 39t ring to the aluminum 24t.

    What it boils down to is that I'm not buying just a steel chain ring--I'm also buying peace of mind and freedom from wincing.

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