Weight difference between Specialized M-5 Alum fork and Carbon fiber Chisel/FACT fork- Mtbr.com
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  1. #1
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    Weight difference between Specialized M-5 Alum fork and Carbon fiber Chisel/FACT fork

    Hey Dudes, Does anyone know what the weight difference in weight is between the Specialized Fatboy M-5 aluminum fork and carbon fiber Fatboy Chisel/FACT fork? Just getting trying to get an idea if it's worth swapping out.

  2. #2
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    I've heard it's close to a pound because I considered it myself. In the end for me I invested in less rolling weight.

  3. #3
    fat guy on a little bike
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    I do not have any experience with SpecialEd fat parts, but I have had a slew of borealis and RSD carbon forks in my possession, along with every suspension fork and a lauf.

    The carbon forks w/ carbon steerer typically weight 690 grams. My all STEEL Surly Wednesday fork weighs 1440 grams, so the typical carbon fork is half the weight of the steel fork.

    if i were a betting man, i would think aluminum would come in about halfway between the carbon and steel forks. Is it worth it? Totally up to you.
    Quiver:
    2016 Surly Wednesday
    2017 Lenz Fatillac
    2019 Lenz Fatillac

  4. #4
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    Thanks guys. I was guessing it might be around a pound. I think if I can pick up a used carbon fork for about $100 from someone that upgraded to a Bluto, then it'd be worth it. I don't want to pay much more though.

  5. #5
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    Quote Originally Posted by YamaBro View Post
    Thanks guys. I was guessing it might be around a pound. I think if I can pick up a used carbon fork for about $100 from someone that upgraded to a Bluto, then it'd be worth it. I don't want to pay much more though.
    I saw a carbon Chisel fat fork on ebay for $60 a few months ago. It lasted a few days.

    Sent from my SM-N950U using Tapatalk

  6. #6
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    Cool. I'll watch for one. Does anyone know if the carbon forks have changed geometry over the years or are they the same? I have a 2016 FatBoy.

  7. #7
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    I have a 2015 Fatboy SE size L. I weighed the Alu fork at 1120 g and the carbon one at 690 g. I bought a takeoff from another MTBR bro who bought a bluto. Mine is the QR model with 135 front spacing. I think 2016 was 150 x 15, but not sure. I liked the carbon fork while I was running it. I too bought a bluto, so I have the CF fork that I might consider selling if you are interested and it fits your bike.

  8. #8
    fat guy on a little bike
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    Quote Originally Posted by Rodney View Post
    The carbon forks w/ carbon steerer typically weight 690 grams. My all STEEL Surly Wednesday fork weighs 1440 grams, so the typical carbon fork is half the weight of the steel fork.

    if i were a betting man, i would think aluminum would come in about halfway between the carbon and steel forks.
    Quote Originally Posted by Chinman View Post
    I have a 2015 Fatboy SE size L. I weighed the Alu fork at 1120 g and the carbon one at 690 g...
    so, my bet was ~1065 grams for the alum fork. I was off by 55 grams... not bad for a guess!
    Quiver:
    2016 Surly Wednesday
    2017 Lenz Fatillac
    2019 Lenz Fatillac

  9. #9
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    You guessed closely enough the total amount of blue bubble bum balls in the coin bubble dispensing maching. You get a gold star.

    I am not concerned with 55 grams of weight.


    Quote Originally Posted by Rodney View Post
    so, my bet was ~1065 grams for the alum fork. I was off by 55 grams... not bad for a guess!

  10. #10
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    Quote Originally Posted by Chinman View Post
    I have a 2015 Fatboy SE size L. I weighed the Alu fork at 1120 g and the carbon one at 690 g. I bought a takeoff from another MTBR bro who bought a bluto. Mine is the QR model with 135 front spacing. I think 2016 was 150 x 15, but not sure. I liked the carbon fork while I was running it. I too bought a bluto, so I have the CF fork that I might consider selling if you are interested and it fits your bike.
    Cool, I'm interested. I'll send you a PM.

    Quote Originally Posted by Rodney View Post
    so, my bet was ~1065 grams for the alum fork. I was off by 55 grams... not bad for a guess!
    Nice! You win!

  11. #11
    Not the fake Jay Leno
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    Weight difference between Specialized M-5 Alum fork and Carbon fiber Chisel/FACT fork-e3bf6b66-548c-43d8-b456-d69f4a8e2841.jpg
    Hereís what the fork looks like. Itís the gloss black with the red design on the inside of the legs. It came off of a Fatboy Expert. Looks good with my stealth Fatboy SE.

  12. #12
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    I live up north so for 4 months i focus on tires not weight. But for 12 months it might be worth it. My all Alu Hellga is a great climber, she deserves 8 months off.

  13. #13
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    Quote Originally Posted by Chinman View Post
    Click image for larger version. 

Name:	E3BF6B66-548C-43D8-B456-D69F4A8E2841.jpg 
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    Hereís what the fork looks like. Itís the gloss black with the red design on the inside of the legs. It came off of a Fatboy Expert. Looks good with my stealth Fatboy SE.
    Oh yeah, that's a great looking bike!

  14. #14
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    A few years back my fatboy Alu fork was 135 and the carbon was 150 so i could not just put on a few $ to switch. Did you check that?

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