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  1. #1
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    1x9 conversion, should I replace the crank or just run as is?

    So I have converted my bike to a 1x9 from 3x9 and was wondering if I really "NEED" to replace the crank with a single crank unit or if it is perfectly fine to just run with the middle ring? Do I need to replace the middle ring with a purpose built single ring? Will I have chain alignment issues to run things as they are?

    If/when I do get around to replacing the stock unit, what would be a good replacement for what I have now? It is an FSA powerdrive BB and FSA alpha drive crank arms.

  2. #2
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    I have no idea if it is better or not. I can say I've never had a problem running a 3X crank just using the middle with a single speed chain-ring. Actually I really like running a bash and an inner guide BBG bashwich, just so simple.

  3. #3
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    As lew posted a BBG bashwich and single speed ring should do the trick. BBG stuff is lite great quality and color choice.

    A Wolf single ring is a good option and I have been running a single Wolf with my 3X crank and no chain guard or bashwich and have not dropped the chain, but I am using a clutch derailleur.

    Your derailleur is critical, as a 3x drive train may be long cage and while this may work it can be less than ideal for your application. Think most 1x use medium or short cage.

  4. #4
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    I jut removed the outter chainring and took an old front derailluer and chopped it down with a dremel to make a chain guard so it won't pop off over rough terrain. Works like a charm, no issues at all. You can also shorten the chain as well if you want, this also helps with the chain not coming off and chain slap.
    Giant XTC 2 29er
    KHS Flagstaff 29er FS
    Neon Bow Trials Bike
    Norco Fluid 9.2 29er FS
    Norco BIGFOOT FATTY

  5. #5
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    Quote Originally Posted by lew242 View Post
    I have no idea if it is better or not. I can say I've never had a problem running a 3X crank just using the middle with a single speed chain-ring. Actually I really like running a bash and an inner guide BBG bashwich, just so simple.
    lew, do you ever get noise from the chain rubbing the bashwich guides?

    Fred

  6. #6
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    Quote Originally Posted by BacDoc View Post
    A Wolf single ring is a good option and I have been running a single Wolf with my 3X crank and no chain guard or bashwich and have not dropped the chain, but I am using a clutch derailleur.

    Your derailleur is critical, as a 3x drive train may be long cage and while this may work it can be less than ideal for your application. Think most 1x use medium or short cage.
    +1

    I was dropping chains occasionally and considered a chain guide/bashwich, but ended up getting a Shimano single chainring for my Shimano M660 and haven't dropped the chain since. I use a medium cage derailleur. I was going to get a clutch derailleur as a last resort before getting some kind of chain guard, but there hasn't been the need.

  7. #7
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    lew, do you ever get noise from the chain rubbing the bashwich guides?
    Nope, only on an old square taper crank when the Q-factor and chainline was miles out and only on the largest cog on the cassette.

    Oh yeah, good points raised, get a short cage derailleur. I'm thinking about getting a Zee and one of those fancy new high ramped chain rings and ditching the bashwich.

  8. #8
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    I recently converted to 1x9 and used my 3x9 crank. I dropped the small ring and replaced the outer ring with a bash-guard. Then I used one of these N-Gear Jump Stops for $10 to avoid dropping the chain. Works great! You can go ahead and buy other stuff if you like, but you don't have to.

    N-Gear Jump Stop Chain Guide > Components > Drivetrain > Chain Tensioners and Guides | Jenson USA Online Bike Shop

  9. #9
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    I have two bikes running 1x9 on 3x cranks......I run a BBG on the outside and a jump stop on the inside and never had a problem....they run great. Why spend more $ then you have too?

  10. #10
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    1x9 conversion, should I replace the crank or just run as is?

    Did a 1x conversion on my son's bike and it worked great until he started getting more aggressive. I then added a pauls guide and no more issues.
    Riding slowly since 1977.

  11. #11
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    Sounds good, thanks for all the advice. As usual, MTBR always comes through with excellent advice from the community.

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