2020 Fourstroke FS 01 Build- Mtbr.com
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  1. #1
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    2020 Fourstroke FS 01 Build

    Well, after six years with virtually the same bike (BMC Fourstroke FS 01, albeit different frames and components every two years), I've built a new bike from just a frame!!! Here id the list of details and weights:

    BMC Fourstroke FS 01 RAD Size Large: 2780g (includes all hardware, droper lever, lockout lever, rear axel, etc.)
    Fox Float 32 SC 100mm: 1400g (with Kabolt and uncut steerer
    No Tubes Stan's Crest CB7: 1480g (with rim tape and valves)
    Vittoria Mezcal XC Race Graphene 2.0 29x2.25: 696g, 702g
    Magura MT8 Race SL: 225g, 224g (uncut lines)
    Selle Italia SLR Kit Carbonio Flow: 130g
    Enve M5 Bar: 192g (760mm)
    BMC stock stem
    Magura Storm SL rotors 160mm: 99g, 100g
    SRAM XG-1295 cassette: 355G
    SRAM X01 Shifter: 121g (with cable)
    SRAM X01 Rear Derailleur: 278g
    SRAM GXP BB: 90g
    SRAM X01 GXP Crankset with 32t ring: 502g (replaced ring with a 36t X-Sync 2 SL)
    Stages PM: +52g (compared to regular X01 crank arm)
    Eggbeater 11 pedals: 174g
    Elite Canibal bottle cage: 35g
    ESI Chunky Grips: 60g
    SRAM X01 12 speed chain: 242g

    After adding up housing, lines, etc., it adds up to 23lbs 5 oz. or 10.56kg.

    Here is a pic from last night after finishing the project.

  2. #2
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    Looks good!

  3. #3
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    Nice work Carlos, that is a sweet rig. Looking at building one up very similar, but starting from the Three model, stripping it down to mostly the frame and suspension, and upgrading from there.

    I'd love to see some additional pictures of the front end and how you did the cable management. Lots of cables to route on this bike, and making it look good can be tough. Looks like you have wrapped them, which is a good call.

    Thanks man,
    Josh

  4. #4
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    Quote Originally Posted by jlm0976 View Post
    Nice work Carlos, that is a sweet rig. Looking at building one up very similar, but starting from the Three model, stripping it down to mostly the frame and suspension, and upgrading from there.

    I'd love to see some additional pictures of the front end and how you did the cable management. Lots of cables to route on this bike, and making it look good can be tough. Looks like you have wrapped them, which is a good call.

    Thanks man,
    Josh
    Iíll post some more pictures. Iíve still got some cable cutting to do though.


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  5. #5
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    Did the frameset come with the three position remote? If so, where you able to get a Fox StepCast with the three position remote top cap? I only see the two position ones listed for the latest model SC forks. I may end building another FS01 from a frameset and looking at fork options.
    Thanks

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    Quote Originally Posted by norty_mtb View Post
    Did the frameset come with the three position remote? If so, where you able to get a Fox StepCast with the three position remote top cap? I only see the two position ones listed for the latest model SC forks. I may end building another FS01 from a frameset and looking at fork options.
    Thanks
    The frame comes with a 3 position rear shock and lock out lever. I did get a Fox Float 32 SC 2 Position Remote but had the shop retrofit the fork to 3 position remote with the 820-05-514-KIT from Fox. Parts and labor added like $140 extra to the fork, which I got at a good discount.


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  7. #7
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    Quote Originally Posted by jlm0976 View Post
    Nice work Carlos, that is a sweet rig. Looking at building one up very similar, but starting from the Three model, stripping it down to mostly the frame and suspension, and upgrading from there.

    I'd love to see some additional pictures of the front end and how you did the cable management. Lots of cables to route on this bike, and making it look good can be tough. Looks like you have wrapped them, which is a good call.

    Thanks man,
    Josh
    Pic of final cable management...


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  8. #8
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    Thanks for the cable management picture. You did well wrestling all those birds nest of cables into a tidy package.

    Have you got any rides on the bike yet? If so, can you give us your takeaways?

    What are the Enve M5 bars like? I'm considering upgrading to those, but haven't heard if they are better (lighter, more damping) than the carbon BMC bars that come stock.

    Thanks for the feedback.

  9. #9
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    Quote Originally Posted by jlm0976 View Post
    Thanks for the cable management picture. You did well wrestling all those birds nest of cables into a tidy package.

    Have you got any rides on the bike yet? If so, can you give us your takeaways?

    What are the Enve M5 bars like? I'm considering upgrading to those, but haven't heard if they are better (lighter, more damping) than the carbon BMC bars that come stock.

    Thanks for the feedback.
    Well, for starters, the bike is a lot stiffer than the previous generation. Also, I like how the seat tube angle puts me in a better position for climbing. Itís true what they say about long reach and slacker head tube angle; point and shoot with ease on downhills.

    As for the bars, I only had BMC bars between 2013-2015 and then switched to Enve bars. The reason I did was for width, itís the only XC flat bars I could find that were at least 760mm wide. I donít care much about weight or damping.


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  10. #10
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    Hey guys, for those who are interested, I'm picking up my 2020 FS 01 Three model this week and will be doing a strip down of almost every component and build up with new spec in the coming weeks. I'll post weights and my feedback of how things come together as I build it up. Looking forward to it. I'll keep this thread going with the details. Thanks!

  11. #11
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    Pictures and build info please...

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    Look forward to seeing the progress and build

  13. #13
    FIRENZE rulez !!
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    This is my close-to-goal build

    Missing change of seat post hardware (one of the yokes came without internal threads)

    However less than 10 kg









    Hopp Carbon




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  14. #14
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    Picked things up from the shop last night.

    This progress will probably be slow, so don't expect the build to be done in the next few days, so please be patient with me.

    Picked the bike box up from my local shop last night, by the looks of the box, it seems like FedEx just drug it behind their truck from Chicago, IL distribution center to my Columbus, OH shop.
    I fully expected things to be broken into a million pieces when I got home, but luckily BMC packs their bikes up very well, and so far from my initial inspections it seems to be OK.
    All I got done last night was pulling all the foam off the bike and placing it my stand, as well as checking out the box of stuff that comes with it.

    A couple quick impressions:
    1) the oval seat post is more tricky to clamp to than a round post, at least for my stand.
    2) the down tube and BB area of the frame are absolutely massive. It honestly looks more like an e-bike than a XC bike.
    3) BMC includes a cheap little handlebar bell (maybe a Euro requirement?), but they don't install the plastic dork disc in the rear wheel (thank you!).
    That's about as far as I got, I hope to make more progress of stripping things off the bike this weekend.
    ps, frame is made in Taiwan in case you wondered.

    2020 Fourstroke FS 01 Build-img_4728.jpg
    2020 Fourstroke FS 01 Build-img_4729.jpg
    2020 Fourstroke FS 01 Build-img_4730.jpg
    2020 Fourstroke FS 01 Build-img_4734.jpg2020 Fourstroke FS 01 Build-img_4733.jpg

  15. #15
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    I believe the bell, reflectors, lights are a Swiss requirement. BMC does a great job of setting up and packing bikes. Probably the best I've seen in 30 yrs of building bikes.

    In case you missed it in an earlier post, a little bit of lateral play is built into the lower shock mount by design. Seems odd, but have to trust the engineers.

    If you want a full lock out with the remote on the fork you have to either tighten the cable enough to clock the dial or get a Scott Twinloc. I've been using the Twinloc and like the adjustment better than the stock DT. The DT lockout does not have enough cable pull. It will lock out the rear fully and leave the front almost locked. By clocking the dial you lose a little of the firm/soft settings which I believe these adjustments are just for when the fork is fully open.

    I can't tell from the pictures but it looks like you have the new rubber chainstay protector. When the chain hits the plastic protector on the 2019 model it would echo loudly throughout the frame. If anyone has noticed this you can wrap the rubber electrical tape that sticks to itself around the chainstay to deaden the sound.

    Enjoy the build and the ride.

  16. #16
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    No pictures to share from this weekend's tear down and build activity, but I'll share some weight detail for those interested.
    First, my FS01 Three is an XL (I'm 6' 2.5", ~35" inseam).
    Stock bike as sold by BMC, not so svelte, which matches my feeling picking it up...
    Total Stock Bike with everything except pedals = 27.4 lb, 12.43 kg

    Now for a break down of the stock parts I've taken off so far, still a few more to go, I'll post those as soon as they come off (fork, stem and bar).

    Front (Fr) wheel w/tire, tube, 180mm rotor = 2045g
    Rear (Rr) wheel w/tire, tube, 160mm rotor, cassette = 2808g

    inner tube = 185g x 2
    Vitorria Barzo tire = 685g (Fr), 660g (Rr) -- not sure why these are different, I measured them multiple times to confirm.
    Shimano SM-RT54-M 180mm rotor = 164g
    Shimano SM-RT54-M 160mm rotor = 140g
    SRAM PG1230 11-50 cassette = 614g

    Alex MD25 w/Deore hub Fr wheel stripped down completely = 1013g
    Alex MD25 w/Deore hub Rr wheel stripped down completely = 1210g

    SRAM SX Eagle chain = 253g
    SRAM NX Eagle Rr Der = 345g
    SRAM X1 Eagle Crank w/34t ring = 452g
    SRAM X1 Eagle non-drive crank arm 175mm = 355g
    SRAM NX Eagle shifter w/cable, no housing = 120g

    Fizik Antares R7 saddle = 231 g
    Fox Kabolt Fr thru axle = 36g
    BMC lock-on grips = 48g x 2
    Shimano MT500 Fr brake lever, hose, caliper, pads = 280g
    Shimano MT500 Rr brake lever, hose, caliper, pads = 307g

    I've installed a few of my new lighter parts, but I'll save those weights for a future post.
    Thanks for following along. Its coming together well.

  17. #17
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    The pleasures of building a new bike...enjoy!!!

  18. #18
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    One of you who has an FS01, could you see if there is slight play in your seatpost that you can feel/see at the clamping bolt? When the suspension is locked out can you press and pull on the seat and see/hear/feel the clamp bolt moving? I know dropper posts should and always will have some play in them but wondering about the clamping bolt and collar moving enough to make a slight noise when it hits the frame. Might not even notice it while riding.

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