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  1. #1
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    Looking for a good compact 46-34 crank to replace my 11 speed 50-34 Shimano 105

    I don't need the speed of 50T on my big ring. Yet I would like an at least as good 46-34 crankset that will fit the BB that my GT Grade Alloy105 has. I'll be very much obliged for any recommendations or suggestions for a good crankset.

  2. #2
    George Krpan
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    Is it possible to simply change the chainring? Also, find a gear inch calculator and check to see if going from 50 to 46 is a material difference.

  3. #3
    Senior Member bikemig's Avatar
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    Swap the big chainring out. The 46 will be easier to spin.

  4. #4
    Senior Member robow's Avatar
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    I have a Shimano 46/34 crankset and bottom bracket that is like new, if interested PM me.

  5. #5
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    Quote Originally Posted by robow View Post
    I have a Shimano 46/34 crankset and bottom bracket that is like new, if interested PM me.
    Thanks, but I live in Thailand, and shipping cost +import tax would be prohibitive.

  6. #6
    Senior Member catgita's Avatar
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    Dropping 4 teeth doesn't sound like much, and won't feel any different other than pedaling down steep hills. What it does do is change which rear cogs you use most of the time, which may avoid front shifting every time the grade changes a bit. Where I ride, I hate 50t rings with a passion. They are momentum killers.

    Be aware that Shimano front shifters are a little more sensitive to non Shimano chainrings with their standard combinations. Their ramps and pins and shift gates are designed to move the chain easily at specific spots, even under power.

    This being said, with a 46t you probably won't be front shifting nearly so often, and a little more patience and technique will still do the job nicely.

  7. #7
    Have bike, will travel Barrettscv's Avatar
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    When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.

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    This seems to be the most practical route. Thank you very much Barrettscv. I wonder if compact Ultegra chain ring 34T is available for this crankset seperately? I'd like to go lower than 36T.

  9. #9
    Have bike, will travel Barrettscv's Avatar
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    Last edited by Barrettscv; 02-08-16 at 08:31 PM.
    When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.

  10. #10
    Team Water Andy_K's Avatar
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    Ribble has a 34T ring for the 6800 cranks. Shimano claims their chainrings are matched, so the ramps on the 50T ring are optimized for a 34T small ring and the ramps on the 46T are optimized for a 36T small ring, but they will still work together. The 6800 crank uses a non-standard bolt pattern, so you need to get the Shimano rings.

    A cheaper option, which is probably still as good as what came on your bike, is the Shimano CX50. This is a 105-level crank with 46/36 rings, but it uses the standard 110mm bolt pattern, so replacement rings are easier to find. In the US I was able to get a 34T ring for the CX50 for under $20.

  11. #11
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    Quote Originally Posted by Andy_K View Post
    Ribble has a 34T ring for the 6800 cranks. Shimano claims their chainrings are matched, so the ramps on the 50T ring are optimized for a 34T small ring and the ramps on the 46T are optimized for a 36T small ring, but they will still work together. The 6800 crank uses a non-standard bolt pattern, so you need to get the Shimano rings.

    A cheaper option, which is probably still as good as what came on your bike, is the Shimano CX50. This is a 105-level crank with 46/36 rings, but it uses the standard 110mm bolt pattern, so replacement rings are easier to find. In the US I was able to get a 34T ring for the CX50 for under $20.
    Thanks. I'll look into it.

  12. #12
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    I got almost the same problem but have SRAM Apex hardware. It's 46/36 crank with a 10 speed 11-28 cassette. I would like to get some lower gearing for hill climbing but don't want to spend too much money for a new cassette and a rear derailler. So I was thinking of changing my small ring on the crank for maybe a 34 which I think is available. Would this 34/28 combination be noticeable or am I wasting my money? Not even sure SRAM will even sell just the 34T ring by itself or even if it will fit but it is an option.

  13. #13
    coprolite fietsbob's Avatar
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    Want New? OEM Cranksets * made to Build up CX bikes, come in 46-36, change the 36 to a 34t.
    * including 105 series .

    2 teeth is really a Small % difference Wear down the one thats on there

    when replacement time comes then get the 34..

    You probably done even neet the replacement to come from Sram,

    a 110 BCD from other companies will probably fit.

    Campag is the one that engineered their new compact double to use Only their chainrings..
    Last edited by fietsbob; 02-11-16 at 12:11 PM.

  14. #14
    Senior Member volosong's Avatar
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    I just put a 46-34 Ultegra 6800 on my new cross bike. It shifts fantastic. No issues at all.

    I purchased a 46-36 6800 crank set and a separate 6800 34 ring. The costs of the inner rings are a whole lot less than the outer ring. It was a trivial swap.

    On the back, I'm running a 6800 11-32. So even the steepest gradients should be possible. (Note: if you go 11-32 on the back, be sure you have the mid-length 6800 RD. The standard length RD won't work.)
    Deut 6:5

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  15. #15
    Team Water Andy_K's Avatar
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    Quote Originally Posted by RockiesDad View Post
    I got almost the same problem but have SRAM Apex hardware. It's 46/36 crank with a 10 speed 11-28 cassette. I would like to get some lower gearing for hill climbing but don't want to spend too much money for a new cassette and a rear derailler. So I was thinking of changing my small ring on the crank for maybe a 34 which I think is available. Would this 34/28 combination be noticeable or am I wasting my money? Not even sure SRAM will even sell just the 34T ring by itself or even if it will fit but it is an option.
    You can get a SRAM 34T ring here: https://www.universalcycles.com/shop...&category=2628

    You'll notice it is labeled as "34t for 50t outer" which has to do with the shift ramp option I mentioned earlier, but the 34T ring has no pins or ramps at all. I've used 34T small rings with 46T big rings and never had a problem with the shifting. I think it's a much better combination than 50-34 for most urban/suburban riding because I don't find myself crossing the threshhold where I want to shift between rings nearly as frequently as I would with a 50-34.

    As for the difference you'll get going from a 36T to a 34T small ring, it's small but as cheap as it is I recommend it. A 34-28 gear is just a bit higher than a 36-30 would be. You'd get a bigger difference with a new cassette, but it costs more. That said, cassettes are getting cheap these days and your current derailleur may be able to handle a 30T or 32T big cog cassette. So maybe do both.

  16. #16
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    Sugino OX901d can get you down to 30t inner:

    SUGINO OX901D Compact Plus+ 11spd

  17. #17
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    Also running 46-34 Ultegra 6800 on my rain/commute/cross bike

    80% of the time I can stay in 46 ring with an 11-28 cassette. it shifts fine.

    When I ride it with roadies I keep up but have to spin really fast, but I'm riding with a guy who uses 54x11

  18. #18
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    Quote Originally Posted by Andy_K View Post
    You can get a SRAM 34T ring here: https://www.universalcycles.com/shop...&category=2628

    You'll notice it is labeled as "34t for 50t outer" which has to do with the shift ramp option I mentioned earlier, but the 34T ring has no pins or ramps at all. I've used 34T small rings with 46T big rings and never had a problem with the shifting. I think it's a much better combination than 50-34 for most urban/suburban riding because I don't find myself crossing the threshhold where I want to shift between rings nearly as frequently as I would with a 50-34.

    As for the difference you'll get going from a 36T to a 34T small ring, it's small but as cheap as it is I recommend it. A 34-28 gear is just a bit higher than a 36-30 would be. You'd get a bigger difference with a new cassette, but it costs more. That said, cassettes are getting cheap these days and your current derailleur may be able to handle a 30T or 32T big cog cassette. So maybe do both.
    Thanks for this link. Will probably go for it. Its like adding another low gear for about $20 or so.

    My rear derailler max says it 28T. So if I do go with a different cassette I will need to replace it. My bike is brand new so it will be rather difficult (wife will start asking questions) to spend this much to upgrade it. Chainring is cheap and hopefully still flies under the radar as far as upgrades go. Maybe in the distant future as I get older and can't get up hills as easily this will be justifiable purchase ...
    Last edited by RockiesDad; 02-12-16 at 01:29 PM.

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