Specialized Fat Boy SE 2016 crankset replacement.- Mtbr.com
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  1. #1
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    Specialized Fat Boy SE 2016 crankset replacement.

    I need to replace (upgrade) my crankset on my Fat Boy SE. I want to go to a single chainring and lighten it up from the stock crankset while I am at it.

    I know the Bottom Bracket is a PF30 (Press Fit). I do not know what width spindle I need. I am thinking a 100, but I am not sure. The rear hub is 190 QR and it can fit 5.0 tires, so my guess is the wider spindle is needed. But I am not entirely sure.

    If anyone knows of any cranksets that would be a good upgrade so I can update the rest (shifters, chain, rear cassete and rear derailleur) to a 1 x 11 or 1 x 12 setup that would be greatly appreaciated.

    I upgraded my Enduro bike with a RaceFace Turbine crankset and like it a lot, but I don't think that crankset is available for a Fat Bike, at least not according to the RaceFace website.

  2. #2
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    RF definitely makes the Turbine for fatbikes. Just need to make sure you get the correct spindle length for your frame. Safe bet would be a spindle that is listed for 190mm rear.

    If you got deep in the maths you could figure out if the smaller 170mm rear-based spindle would actually fit the frame and where it would place your chainline.

  3. #3
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    Quote Originally Posted by bme107 View Post
    If you got deep in the maths you could figure out if the smaller 170mm rear-based spindle would actually fit the frame and where it would place your chainline.
    Wouldn't the width of my bottom bracket play a role in how wide the spindle needs to be?

  4. #4
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    It isn't specifically what you asked for, but it is a data point. I have a 2013 Fatboy Comp. It also has 190mm rear spacing. I'm using the 170mm Race Face Turbine on it and I like it a lot. The 170mm version may not be for everyone, but I'm glad I used that one and not the wider 190mm compatible one.

    The crank arms are close to the chainstays, but not too close. It results in a little better Q, although I'm one of three humans that actually is more comfortable on a wide Q anyway. The arms were only about 1mm closer to the stays compared to the Sugino junk my Fatboy came with. The pre-load adjuster is much better than the wavy washer that the stock crank on that model used. I really don't care about weight, so I didn't weigh the stuff as I did the swap. Plus I went from 2X to 1X so I likely lost a few hundred grams.

    If anything my chainline is just a smidgen outboard still. It is the price to be paid for 5 inch tire clearance on a fat bike. I used the widest range 11 speed I could from Shimano, so I have the 46 tooth. I bought it as a set with the shifter, rear der, and cassette. The system "sounds" cross chained in the 46t, although it works perfectly. I really wanted the 46t because I ride this bike 6 months out of the year, and I actually use it in snow. The Shimano concept of the 37t to 46t jump works best for me because I get a nice 10 speed ratio, and a big jump for a bail out in high resistance snow.

  5. #5
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    Quote Originally Posted by manual63 View Post
    Wouldn't the width of my bottom bracket play a role in how wide the spindle needs to be?
    Yes and no. You need a "fatbike" crank (spindle). Your BB will be 100mm if it has threaded cups or 120-122mm(?) if it is press-fit. Add the threaded cups to the former and you are at the same width as the latter.
    The major difference between the 170 and 190 rear-based cranks is that the 190's use spindle spacers between the outer BB bearing race and the back of the crank-arm to give more width and allow for wider chainstays and a larger tire. Many are able to get away with the shorter spindle if the arms physically can spin past the chain stays.

  6. #6
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    Spec have spec some turbine in the past with a 170mm spindle and a reverse chainring on 190mm rear end. I think itís the way to go if you want a shorter q-factor.

  7. #7
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    Quote Originally Posted by bme107 View Post
    Yes and no. You need a "fatbike" crank (spindle). Your BB will be 100mm if it has threaded cups or 120-122mm(?) if it is press-fit.
    The Fatboy has 100mm BB and is press fit.

    OP...You can use the spindle specified for the 170mm rear.

  8. #8
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    You got me, it has some abomination of a press fit yet external bearing on the AL models.


    I'm totally guessing that it is still 120-122 from outer race to outer race.

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