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Thread: So you want to go one chainring...

  1. #1
    MoJo Mother Superior RidingAgain's Avatar
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    So you want to go one chainring...

    Just thought I'd ask about chainline, cranks made for a single chainring vs. older cranks made for two or three, differing geared cassettes, rear derailleurs, and how the BB type/design comes into play? Did I forget something?

    Thanks.

  2. #2
    Mojo Bike Part Terminator Seths Pool's Avatar
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    to keep it really simple, whatever 104 BCD single chain ring you get will go where the middle chain ring was on the triple ring cranks. super common change people used to make, you shouldnt have a problem. dont over think every one of these component upgrades you've been interested in lately. I have a buddy like you named Steven. it took him over 4 months to build a wheel set. making spread sheets, graphs, charts, powerpoint presentations to himself to weigh his options, constant questions on our opinions on every rim and spoke option you can think of... by the end of it we basically had banned him from asking any more questions about it. lol
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    Don't worry about the youtube hype trying to drive youtube dollars to their channel with click bait titles. My 1x11 SRAMs are fantastic and do not back off any of the cogs under backspin in the stand. I don't backspin on the trail more than a 1/2 turn ever to set up a move. If you are doing more, you are doing it wrong and should think about your timing.

    Direct mount chainrings are the bomb. Make sure you get the correct spaced chainring 0-3-6mm.

    People do run into issues with running the shimano medium cage 11s on the larger cassettes because they should have bought a Long cage, especially with the 11-46. Especially if their frame is slightly tweaked, and especially if there is bearing play in their freehub.
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    MoJo Mother Superior RidingAgain's Avatar
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    Thanks, Seth, but I don't do graphs, etc.... I just like to know what's what regarding what I'm looking at. For instance, I want to go with Shimano 180mm cranks. I can buy an older used set, or the newest set; and from what I've read there's a difference re. chainline between them. Do I buy new so that if I upgrade my bike I can switch the 180mm cranks to the new bike? I've also come across some thoughts that a medium cage derailleur works better with a 1 x 11 set up. I'm just asking for feedback from the experience of riders here on Mojo. BTW... Also recently found out that there are different types of Lefty hub sizes, and not all work with the different Lefty versions.

    Here's an article on the chainline matter...

    https://www.oneupcomponents.com/page...-and-non-boost

  5. #5
    MoJo Mother Superior RidingAgain's Avatar
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    Quote Originally Posted by FJsnoozer View Post
    My 1x11 SRAMs are fantastic and do not back off any of the cogs under backspin in the stand. I don't backspin on the trail more than a 1/2 turn ever to set up a move. If you are doing more, you are doing it wrong and should think about your timing.
    Far as I know, the only time I backspin is to avoid hitting a rock with my crank, or trying to reset for an uphill... And in each case it pretty minimal.

    Quote Originally Posted by FJsnoozer View Post
    Direct mount chainrings are the bomb. Make sure you get the correct spaced chainring 0-3-6mm.
    Cool, thanks for the tip.

    Quote Originally Posted by FJsnoozer View Post
    People do run into issues with running the shimano medium cage 11s on the larger cassettes because they should have bought a Long cage, especially with the 11-46. Especially if their frame is slightly tweaked, and especially if there is bearing play in their freehub.
    That's interesting, as I've read that people have problems with the long cage, but that may be with 36-42T cogs... Haven't really read much feedback on larger sizes.

    I have noticed that some folk change their cages to one of the companies other than Shimano and SRAM... Any thoughts on why?

  6. #6
    MoJo Pope throet's Avatar
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    Before we start down this path again, can you update us on where you landed with your last project?

    "So I'm about to pull the trigger on having my Lefty converted to a PBR (air) system (currently spring). I can go two ways... Retain the 140mm travel which will work with up to a 27.5" wheel size... Or get it set up for a 29" wheel size, which means a shorter 110mm (some say they can get 120mm to work with lower profile tires) travel."

    I'm not one to make recommendations, but as an outside observer it would appear that you are as interested in debating the merits of everybody else's suggestions as you are in actually upgrading your bike. Just saying!
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    Quote Originally Posted by RidingAgain View Post
    Far as I know, the only time I backspin is to avoid hitting a rock with my crank, or trying to reset for an uphill... And in each case it pretty minimal.
    Then you should have no issues anyways. most of the threads on MTBR are people who unnecessarily backspin their pedals and bitch about their chain dropping off the 42.

    I have worked on a few bikes that did this in the stand and there are always other issues at hand with their setup and it is not just their 1x. I am no professional bike mechanic, but I have fixed more of their mistakes that I like to think about. I do take the time to isolate what is actually at the root instead of blaming a new drivetrain setup.

    Think about an aluminum bike or a full suspension bike that has had one wreck, or enough parking lot shenanigans to flex the chain stays to the side. if it was off by just enough, it WOULD drop when spinning the pedals backwards in the stand. There is enough drag in the freewheel and Mech to create slack in the links between the chainring and the cassette and drop down and to the left. Same thing can happen if you have slop in your freewheel and it happens to be tilted inwards.

    Most people will never know that their frame is out of alignment because its not noticeable or even an issue until you perform this feat.

    Since you are most likely considering this on your ooooold frame, you might keep the above rant in mind.


    Quote Originally Posted by RidingAgain View Post
    That's interesting, as I've read that people have problems with the long cage, but that may be with 36-42T cogs... Haven't really read much feedback on larger sizes.
    Do yourself a favor, Get a SRAM GX long cage and the forged 10-42 (non pinned) 1195 or 1199. Why spend more on the cassette? Its strong. I have run through 6 - 7 1150, 1175 (OEM only) and 1180 cassettes. If you put big torque through the chain or aren't the smoothest shifter, you can do bad things to the climbing rings.

    Quote Originally Posted by RidingAgain View Post
    I have noticed that some folk change their cages to one of the companies other than Shimano and SRAM... Any thoughts on why?
    Not on Sram really... Are you talking about 10speed?

    One-up makes a replacement cage to get the correct geometry for 11-42; I have one and it is flawless. (wolftooth makes the goat link to achieve the similar alignment) I have the Rad-R cage which is meant for the short cage derailleur on the Saint and Zee. I've had this since I was on 26' and had only ever ridden greenbelt. In the beginning I ran an expander cog and it never ever had an issue. Then I just ran it on an 11-36 and it now lives on its 4th bike. It is has been bulletproof. It is really compact and out of the way if you are bad at line choice.

    The SRAM GX 10s are usually good to go out of the box with a little tinkering with B screw placement. in some cases you need a longer B screw. They have a clutch too.

    The same cannot be said for 11-42 10s setups. You either run an expander cog which can always be finicky with the 16T replacement, or you run a Sunrace cassette, which you will probably bend at some point. These are so cheap, I would buy two and keep a spare.


    As much as I would love to argue the topic, please don't post hyperlinked rebuttles of one dude's experience on a bike for which he hasn't completely isolated the issue or setup at least 10 of the same drivetrain on multiple bikes.
    Last edited by FJsnoozer; 12-27-2017 at 03:42 PM.
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  8. #8
    Mojo Bike Part Terminator Seths Pool's Avatar
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    Quote Originally Posted by throet View Post
    Before we start down this path again, can you update us on where you landed with your last project?

    "So I'm about to pull the trigger on having my Lefty converted to a PBR (air) system (currently spring). I can go two ways... Retain the 140mm travel which will work with up to a 27.5" wheel size... Or get it set up for a 29" wheel size, which means a shorter 110mm (some say they can get 120mm to work with lower profile tires) travel."

    I'm not one to make recommendations, but as an outside observer it would appear that you are as interested in debating the merits of everybody else's suggestions as you are in actually upgrading your bike. Just saying!
    so basically he is saying you need to make a graph showing us your progress on correlation to the amount of requests for opinions you've made recently
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  9. #9
    MoJo Mother Superior RidingAgain's Avatar
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    Quote Originally Posted by throet View Post
    Before we start down this path again, can you update us on where you landed with your last project?

    "So I'm about to pull the trigger on having my Lefty converted to a PBR (air) system (currently spring). I can go two ways... Retain the 140mm travel which will work with up to a 27.5" wheel size... Or get it set up for a 29" wheel size, which means a shorter 110mm (some say they can get 120mm to work with lower profile tires) travel."

    I'm not one to make recommendations, but as an outside observer it would appear that you are as interested in debating the merits of everybody else's suggestions as you are in actually upgrading your bike. Just saying!
    Dude... Fuck off and don't waste your time on my threads then. It really isn't rocket science.

    Now...

    The above reality aside... Let's see if I can help you.

    Each thread I've started is dealing with a particular matter. And each matter is one related to questions/comments I've come across in face-to-face conversations with people, or on other online forums... And beside feedback helping me, I hope it helps others as well.

  10. #10
    Mojo Bike Part Terminator Seths Pool's Avatar
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    Quote Originally Posted by RidingAgain View Post
    Dude... Fuck off and don't waste your time on my threads then. It really isn't rocket science.

    Now...

    The above reality aside... Let's see if I can help you.

    Each thread I've started is dealing with a particular matter. And each matter is one related to questions/comments I've come across in face-to-face conversations with people, or on other online forums... And beside feedback helping me, I hope it helps others as well.
    that doesnt look like a graph
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    Quote Originally Posted by RidingAgain View Post

    Each thread I've started is dealing with a particular matter. And each matter is one related to questions/comments I've come across in face-to-face conversations with people, or on other online forums... And beside feedback helping me, I hope it helps others as well.
    Yes, but to his point...

    You post these threads and ask for local opinions and then you copy and past Other People's opinions from other forums to rebut our opinions and then ask us to respond to and defend our opinions.

    It gets old.
    Last edited by FJsnoozer; 12-27-2017 at 04:00 PM.
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  12. #12
    MoJo Mother Superior RidingAgain's Avatar
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    FJsnoozer says... "As much as I would love to argue the topic, please don't post hyperlinked rebuttles of one dude's experience on a bike for which he hasn't completely isolated the issue or setup at least 10 of the same drivetrain on multiple bikes."

    I try not to argue... It's a waste of time.

    And thankfully, having some experience in research, I know not to take one person's speaking as the last word on a matter.

    And thank you for your feedback, it was very helpful and much along the line of what I'm looking for.

  13. #13
    MoJo Mother Superior RidingAgain's Avatar
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    "...and then you copy and past Other People's opinions from other forums to rebut our opinions and then ask us to respond to and defend our opinions."

    I see this (and I do it very infrequently) as simply adding to the discussion. I'm not asking anyone to defend themselves. For me it's just a way to dig deeper into the matter so that I can better understand it.

  14. #14
    I came here for the Tacos redrider3141's Avatar
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    Last year I finally admitted that my 2x9 (3x9 minus the 3rd cog) drivetrain was sacked on my 2007 DB Mission and I was set on getting the SRAM NX or Shimano XT 1x11 systems. I am a graph person and review reader and it was close but decided to go with the Shimano XT 11-42. I've never replaced a full bike drive train, even so, installation was easy and I had no issues, even on my "older" frame/ wheelset. I also installed an AbsoluteBLACK 32T oval at the same time, this actually might be my favorite part of the whole system. Chainline is wide at the extents but matches well with where I usually ride at. It never gets too close to the frame/tire, etc. Shifting is smooth and easy, no backpedaling issues and so far have had no chain drop problems. I only recently started riding with the derailleur clutch engaged, the trails are much bumpier than where I used to live.

    I've been very happy with it, probably would have been happy with the NX too.

    I eneded up going with:
    -11-42 cassette
    -32T AbsoluteBLACK Oval
    -M8000 XT Cranks
    -M8000 Rear derailleur and Rear Shifter
    -Shimano 11 speed Chain
    -XT BB shell (I think)

    It's not too hard to shop around and find it for far less that list price from a reputable store.
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    For Trails: 2007 Diamondback Mission FS
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    Quote Originally Posted by RidingAgain View Post
    "...and then you copy and past Other People's opinions from other forums to rebut our opinions and then ask us to respond to and defend our opinions."

    I see this (and I do it very infrequently) as simply adding to the discussion. I'm not asking anyone to defend themselves. For me it's just a way to dig deeper into the matter so that I can better understand it.
    The way that you do it sure feels like you are baiting people. You clearly have done your forum research on these topics. Most people would post all of their research and findings in the original post where it could be addressed in their first post.

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    MoJo Pope throet's Avatar
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    Quote Originally Posted by RidingAgain View Post
    Dude... Fuck off and don't waste your time on my threads then. It really isn't rocket science.

    Now...

    The above reality aside... Let's see if I can help you.

    Each thread I've started is dealing with a particular matter. And each matter is one related to questions/comments I've come across in face-to-face conversations with people, or on other online forums... And beside feedback helping me, I hope it helps others as well.
    So in another words you haven't done jack with that POS bike of yours but want to continue antagonizing others uninhibited. You're a real piece of work!
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  17. #17
    MoJo Mother Superior RidingAgain's Avatar
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    Thank you, redrider3141...

    I'm thinking...
    - 11/42 Sunrace cassette
    - 32T AB Oval
    - XT cranks (not sure what series)
    - SLX r. derailleur
    - Hope BB (have it already)
    - KMC/SRAM chain

  18. #18
    MoJo Mother Superior RidingAgain's Avatar
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    "The way that you do it sure feels like you are baiting people. You clearly have done your forum research on these topics. Most people would post all of their research and findings in the original post where it could be addressed in their first post."

    Not trying to bait people with threads... No interest in that.

    Now when someone acts like an ass in a thread, that's fair game.

    And yes, I do my research, and can put more into my OP... And will from now on. But feedback from local knowledge gives me a different POV from feedback coming from folks in different parts of the country.

  19. #19
    MoJo Mother Superior RidingAgain's Avatar
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    Quote Originally Posted by throet View Post
    So in another words you haven't done jack with that POS bike of yours but want to continue antagonizing others uninhibited. You're a real piece of work!
    LOL... Dude... Really... A thread on an online forum antagonizes you.

  20. #20
    MoJo Mother Superior RidingAgain's Avatar
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    ^^^See the above, FJsnoozer... That's baiting.

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