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  1. #1
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    Do I need boost specific cranks or not?

    I'm getting conflicting answers.

    Plan to build up a new frame. It has a boost rear hub at 148mm.

    I have a new set of Shimano SLX M7000 cranks which have a chainline of 48.8mm I would like to use.

    I'm running 1 x 11 speed Shimano cassette 11-46 tooth.

    Do I need boost specific cranks with a 52mm chain line?

    I have heard if you are running 11 speed the NON-boost cranks with the 48.8 chain line is actually better.
    Is that only for 11-42 cassetts? Not 11-46?

    Anybody have any input?

  2. #2
    RAKC Industries
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    the bigger the rear cog the better the non-boost chain line is especially with bikes that have short chain stays.

    And depending on the shinamo bottom bracket the chain is adjustable a little bit via the spacers if you get an issue of chattering on the bottom of the cassette.

    Also depends on where you expect to spend most of your time on the cassette. If your on the bigger cogs most of the time the non-boost. If your on the bottom half on the smaller cogs most of the time then boost would be beneficial. these narrow chains and wide cassettes are put strain on chains (hence they dont last as long) so if you dial your chain line to there you spend most of your time on the cassette that will help.

    But boost chain line isnt needed unless you need the tire clearance.

    Sent from my SM-G950U using Tapatalk
    Life on a bike doesn't begin till the sun goes down.


  3. #3
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    Quote Originally Posted by RAKC Ind View Post
    the bigger the rear cog the better the non-boost chain line is especially with bikes that have short chain stays.

    And depending on the shinamo bottom bracket the chain is adjustable a little bit via the spacers if you get an issue of chattering on the bottom of the cassette.

    Also depends on where you expect to spend most of your time on the cassette. If your on the bigger cogs most of the time the non-boost. If your on the bottom half on the smaller cogs most of the time then boost would be beneficial. these narrow chains and wide cassettes are put strain on chains (hence they dont last as long) so if you dial your chain line to there you spend most of your time on the cassette that will help.

    But boost chain line isnt needed unless you need the tire clearance.

    Sent from my SM-G950U using Tapatalk
    Ok. Thanks. That helps.

    As far as BB, it will be a press fit.

    I was considering one of the the thread together types like the Wheels MFG ones. Does that matter? Is that still adjustable?

    I'll probably be in the middle and bigger cogs most of the time.

    Running a Maxxis 2.3 Aggressor in the rear.

  4. #4
    RAKC Industries
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    I dont know with press fit, havent messed with it. Current bike doesnt have shimano (cannondale cranks that came on it) and it is press fit but vastly different design. If I have to replace it then I'll be getting the conversion cups so I can run threaded bottom brackets.

    And your far from a tire width that is on any concern.

    Sent from my SM-G950U using Tapatalk
    Life on a bike doesn't begin till the sun goes down.


  5. #5
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    Quote Originally Posted by RAKC Ind View Post
    I dont know with press fit, havent messed with it. Current bike doesnt have shimano (cannondale cranks that came on it) and it is press fit but vastly different design. If I have to replace it then I'll be getting the conversion cups so I can run threaded bottom brackets.

    And your far from a tire width that is on any concern.

    Sent from my SM-G950U using Tapatalk
    Really appreciate the help.

    The Wheels MFG comes with some shims/spacers. So that may help.

    I may give the cranks I have a try and see how it goes. If it doesn't work right I'll get new cranks.

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