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  1. #1
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    Aiming for sub 20lbs Fatbike build.... Lightest 31.6mm mtb seatposts?

    Wondering if I can go lighter? Anyone know the lightest 5 31.6mm seatposts for this year that can take xc mtbing?

    I am debating a new seatpost or run what I have for my new ww fatbike for snow riding. I am 140lbs. Aiming for sub 20 lbs with front suspension.

    I have a Woodman Carbo EL seatpost, 30.9 x 400mm at 125g. Add a 40g aluminum shim puts me at 165g.

    I can drill out my shim and knock off 10g easily and safely I believe. Might be able to trim post down too but still waiting for my frame to come in the mail.

    WW Wisdom is appreciated...

  2. #2
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    Schmolke TLO for the win. 31.6 x 350 = 91 grams.

  3. #3
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    Perfect xc71! I shoulda known. I run a sub 100g 34.9mm TLO on my race machine. I also just searched my pile of bits and found a 31.6 aluminum post. Weighs in a 131g.

    Hmmm so for about $18 a gram I can drop 33g..... To be decided upon frame arrival and weigh in.

    Thanks xc71

  4. #4
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    You bet. Very interested in your build, as I ride snow covered singletrack for approx. 5 months of the year. Will this bike be geared at sub 20 lbs.?

  5. #5
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    Borealis Custom Build Sub 20lbs (Hope so)

    I will weigh in when I have all parts but here is the guesstimate:

    Borealis Yampa m 1270g
    Next SL 175mm (30t ring/bb incl) 585g
    Egg Beater 11 174g/pr
    XX1
    Chain 253g
    Shifter w cable 105.5g (minus 10g switch to mini ilinks/swift)
    Cable Housing 61g
    Derailleur 242.1g (minus approx 40g for flite pulleys and cage mech)

    Extralite 90mm stem 81g
    Extralite grips cut 10g
    Extralite headset (w topcap/bolt/taper adapt) 55g
    Schmolke bars 80g (or 110g nn wider bars I have depending on how twitchy it feels in the snow),
    Bar Plugs 1g/pr
    Teknologika seat 126g
    6KCycles Seatpost 131g (might have to go TLO 91g)
    MT ZOOM clamp 5.5g
    Total: 3130.1g

    Wheelset #1: 5037g
    Northpaws 550g (x2= 1100g)
    Borealis hubs 189g + 359g= 548g
    XD-11 Drive 82.3g
    Cassette 263.9g
    SiCCC SFL 160mm rotors 55g (x2= 110g)
    Rotor Bolts 4.8g
    Sapim Superspokes 64 spokes 240g
    Husker Du's 1240g (x2= 2480g)
    Skewers
    Tape
    Sealant 100g (x2= 200g)
    American Classic Valve Stems 4g (x2= 8g)

    Tubeless Wheelset #2: 5715.8g
    Crazy drilled out Darryls 1170.8g
    Borealis hubs 189g + 359g= 548g
    XD-11 Drive 82.3g
    Cassette 263.9g
    SiCCC SFL 160mm rotors 55g (x2= 110g)
    Rotor Bolts 4.8g
    Sapim Superspokes 64 spokes 240g
    Bud 1563g
    Lou 1528g
    Skewers
    Tape
    Sealant 100g (x2= 200g)
    American Classics Valve Stems 4g (x2=8g)



    And then of coarse my Look Fat Fournales 1578g (but drilling/shaving also say approx -150g) (EDIT Done: came out to 1519.8 but still swapping out bolts)

    Will give true weights when come in but these are pretty close.

    Using the lightest variance here I am 9720.5g/ 21.43 lbs not including skewers and rim tape.

    I really want to hit 20 even or under just to do it.
    Last edited by WickedLite; 12-15-2013 at 06:06 PM. Reason: keeping all calculations in one spot

  6. #6
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    Very nice. Gonna be a killer Fat Bike.

  7. #7
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    Thanks xc71. I just reposted more specs. Just missing skewers and tape. I'm .55 lbs over my goal. what do ya think?

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    I'm doing a very similar build with a Lefty and I'm projecting it out to be 28lbs. One of us is way off (hopefully me). My XL Yampa is 1398g, plus X01, Bud/Lou, drilled RD, R1's, etc.

    Your housing will be much less than 61g (~20g) because of the internal routing. But I'd like to see a pic of your RD's at 550g or even 700g. I drilled mine to go from 870g to 800g each.

  9. #9
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    Looks like its going to be tough getting under 20 lbs. as you've done a great job so far.
    At your weight and for snow riding you could look at Sapim Superspokes. I have a wheelset built with them and so far so good. (not a Fatbike )
    Tune Speedneedle saddle is light at 87 grams, still has a leather cover which is nice for winter riding and the saddle does have alot of flex which I find makes it comfy.
    I would go Powercordz prime housing with Powercordz cable or I-Links and Powercordz cable. I wouldn't run PC cable with Mini I-Links.
    I'm really happy with Kettle's carbon brake pads for the SFL rotors - great stopping power and there only 8 grams for the set = XTR 985.

  10. #10
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    Good point on the housing. I still need some weight loss.

    My total bike weight was with the lighter Northpaws with Dillingers which makes a huge diff in weight right there. Looks like I'm gonna be 21lbs or a hair under unless I drop my suspension.

    I went with the Surly site stock weight on the Holy RD's 700g each. I weighed but lost paper and forget. RD's are at my machinist/engineer to get every gram I can outta there. A shop showed me a 30g drop drilling the odd spoke holes out that were not being used. In comparison, I should be a for sure 150g each off and hopefully a little more. I will get pics when I get them back, before and after anodizing. Huge cuts and many side profile holes.

    It's all the little bits that add up and I think I am close to on track. I had a +38lb Necro TANK last year. I rode it so much last winter, I figured I earned this one.

  11. #11
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    Never heard of the Superspokes. Always ran CX-Ray. I see the they are about 40g lighter. Nice!

    Hard to change the saddle. That Tune is crazy lite and scary..yikes. Teknologika just seems to fit and feel right. Every other saddle has always hurt. I prefer the flow but I have both on 2 bikes and 1 already for the fat.

    I will have to weigh in the Formula organics. Google-ing I am seein 20.4g 2 pads.

    All great info and I appreciate the help!

  12. #12
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    EDIT: nevermind, just saw that you already have rims!
    Good luck with the build! sub 20lbs would be pretty impressive!

  13. #13
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    Those rims sure look sweet, tubeless ready and at 590g/ 85mm... very nice but at $1500 they are outta of my budget this year.

    My Darryls should really come in between 630-650g if I am correct (so not too far off the carbondales) but then I have tape and more tape for a good seal. Hoping to get away without going ghetto which will pain me.

    Northpaws are 120g each so huge weight savings in comparison but narrow with less float. Easy tubeless conversion.

    Dropping my suspension puts under the mark forsure. Borealis fork at 575g uncut is crazy light but I gotta do my Fat Look Fournales at 1578g. It was magic when I put them on last year for longer funner rides. Gonna try and knock some weight off with the drill here too.

    This is MAAAD science

    So the dream now is weight drops for TLO post -40g, Superspokes -40g, rims -140g, housing -30g, fork unknown, brake pads unknown. That puts me at sub 20 lbs. These are still going to be a give and take when true weights come in and I still have to add skewers/tape/spacers and misc.

    I will start getting picks when everything starts coming together. Frame should be any day. New 6 paw hubs are delayed till Dec 5th. So I'm itchin hard utilizing this time for cold hard calculating, hoping and customizing.

  14. #14
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    Lightest Holy Darryls Ever! I didn't say safest...

    I stopped in to see how my Holy Rolling Darryls were comin. HOLY!!

    So they weighed in at 853g and 871g before. Here is a pic of one after drilling. Still need to smooth the edges so it's not a rolling flat.

    Now 600.5g for one and the other one is getting it's trim.

    I don't know how safe this is but it's done now. I have seen bigger cutouts on clownshoes so not too worried but yes a little.

    Aiming for sub 20lbs Fatbike build.... Lightest 31.6mm mtb seatposts?-img_3428.jpgAiming for sub 20lbs Fatbike build.... Lightest 31.6mm mtb seatposts?-img_3429.jpg

  15. #15
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    Quote Originally Posted by WickedLite View Post
    Click image for larger version. 

Name:	IMG_3428.jpg 
Views:	267 
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ID:	848474
    This is awesome. I cant wait to see the finished build. I really hope those hold up!

  16. #16
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    WW Fatbike eh? I have seen it all...

  17. #17
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    Quote Originally Posted by moefosho View Post
    WW Fatbike eh? I have seen it all...
    Really? Have ya seen a sloth with sunglasses before..probably. Name:  Sloth.jpg
Views: 2488
Size:  5.9 KB

    Maybe not a Ze-brant?
    Aiming for sub 20lbs Fatbike build.... Lightest 31.6mm mtb seatposts?-ze-brant.jpg

    Worth a WW look for real:
    Found: Outrageous 64g Dura Ace Derailleur
    Aiming for sub 20lbs Fatbike build.... Lightest 31.6mm mtb seatposts?-64g-dura-ace-derailleur1-499x600.jpg

  18. #18
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    try not to eat before riding those rims

  19. #19
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    I'm 140lbs full and the bikes lookin like 20.5lbs. Fat tires for cush. Front suspension for cush and then the snow. I outta be alright. Don't ya think?

  20. #20
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    The more cush you get from the tyres, the lighter you can go on the rims.

  21. #21
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    Re: Aiming for sub 20lbs Fatbike build.... Lightest 31.6mm mtb seatposts?

    Quote Originally Posted by WickedLite View Post
    I'm 140lbs full and the bikes lookin like 20.5lbs. Fat tires for cush. Front suspension for cush and then the snow. I outta be alright. Don't ya think?
    You should be just fine. I wouldn't worry for a second. Still plenty of meat on those wheels.

  22. #22
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    Quote Originally Posted by WickedLite View Post
    I'm 140lbs full and the bikes lookin like 20.5lbs. Fat tires for cush. Front suspension for cush and then the snow. I outta be alright. Don't ya think?
    I don't think I would run those at a bike park in the summer, but for snow riding at your weight along with the monster Bud & Lou tires it should be fine.

  23. #23
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    Thanks for the reassurance guys! I usually push the limits of safety in everything without worry but was really curious on this one after looking at them.

    Frame shows tomorrow or next and I will get a true weigh in before and after paint. I have always loved the Smokey & the Bandit and Smokey Yunick's gold/black theme but I think I am gonna love old school bmx, chrome (Alsa Killer Chrome) with black letters. Anno red wheels and hubs.

  24. #24
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    I have seen all of those things.

  25. #25
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    If you are lucky you might get lighter tyres. My dillingers (albeit studdless) weighed in around 1180g each.
    Would rather be out riding!

    It's not just about a bike

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