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  1. #1
    pedal up
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    Scott Spark 24 * bling build JR

    finally completed the build and it fits my good boy real fine...

    shout out to xc71 for inspiration!


    Scott Spark JR 24
    X-Fusion 02 shock
    RockShox SID - carbon crown - 28mm stanchions

    RaceFace Sixc carbon cranks - 170mm
    XTR 24t ring
    XTR rapid fire plus rear shifter
    XTR shadow rear derailleur
    XTR 9-speed cassette - 11-34t
    KMC X10SL chain - gold nitride
    BBG superlight bash guard
    AEST pedals - ti axle magnesium platform

    XTR hydro brake lever set - BL-M975
    XTR front + rear brakes - BR-M975
    Ashima Ai2 rotors - 160mm front - 140mm rear
    Ashima aluminum rotor bolts

    Alex Ace20 rims
    Circus Monkey HDW2 hubs
    Circus Monkey ti skewers
    ti spokes
    Schwalbe Rocket Ron - 24x2.1 - front
    Schwalbe Mo Joe - 24x1.85 - rear

    RaceFace Next SL - low rise carbon bar
    Specialized Enduro Grips
    RH+O stem
    Box zero stem spacers
    Box helix quick release seatclamp
    RaceFace seatpost
    stock seat

    sub 22lbs

    he's not the aggressive rider of that 8yr old pack... this little machine sure stepped him up... charging the trails!


    Scott Spark 24 * bling build JR-img_2194.jpg

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  2. #2
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    Looks great, very nice.

  3. #3
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    Bling??? You ain't kidding!
    Very nice!
    I see you have the bashguard and the chainring mounted on the backside of the crank spider. Is there spacers between the two, or how did you do it?
    I think I may look into those pedals for my daughter. Look pretty light!

  4. #4
    pedal up
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    got my uber bike mechanic extraordinare Steve @ Atomic to do the build.

    not sure on the bashgaurd have to take a look / ask him... think he further ground down the old purple chainring bolts i had laying about.

    Toronto Cycles is the best place for the pedals. they were out when i got them. TC is the least expensive i've seen them and they even can anodize the spindles now!

    the pedals are sharp with the little grip bolts - potential shin scrap there - but uber light, great grip and perfectly sized for those little-big feet.

  5. #5
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    She's got some Sinz pedals with the metal posts and so far hasn't had any shin/pedal incidents. They probably are much heavier than those though.
    I think I found them listed at 80mm x 80mm. Is that actually what they measure? If so, they are 10m smaller each way than these Sinz, which wouldn't be a bad thing.

  6. #6
    Goat of Legend
    Reputation: mountaingoatepics's Avatar
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    Nice build!
    How long are you boys legs though running 170mm cranks?
    I just put my daughter (9yo) on a 24" bike. I noticed with a 25% bend at the knee full extension her knees were still coming up to her chest when the crank was at the 12 noon posistion with 152mm cranks. Got some 135mm cranks for her and she and I both have noticed a dramatic increase in her power and speed as well as a normal bend in the knee at 12 noon. She has a 24 inch inseam for reference. It can vary depending on preference but leg length in inches x 5.48 produces a fairly accurate crank length in mm.

  7. #7
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    i think they're about that. (don't have them at my fingertips to measure). was happy with the eyeball size. wanted as big a contact area as possible though they seem just right for a youngster.

    you definitely won't find a lighter pedal and the price point is great for the weight. i saved something like 200gr with the switch - ie nearly half a pound!

  8. #8
    pedal up
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    The crank length was a concern. My son is all leg (like me). We've only had 2 quick rides and i haven't gone over all the ergonomics but the setup as is looked like it was made for him. I'll scrutinize with him aboard tomorrow.

    It came with 152mm (which i thought was 160mm) and when i discovered we went up a full 18mm i thought f@#$ [hey can you swear on the family forum]? But then wasn't too concerned because the used Sixc cranks would always work on his next bike.

    The other concern was ground clearance & litteraly would his toe be hitting front wheel?. But this looks good. The 26" fork mounted to the 24" frame makes for a bit of a cool laid back geometry and does raise the bb height. Don't think he'll be doing any crazy rock gardens, nor will severe pedal strikes be a concern.

    I'll measure and do the 5.48 calculation tomorrow (:

  9. #9
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    You can look at the Utah Trikes cranks or Thorn cranks from Sjscycles. Both come as low as 150mm iirc and they are fairly light.

    Otherwise, that is an awesome build. It's better equipped than my own ride!

  10. #10
    try driving your car less
    Reputation: jh_on_the_cape's Avatar
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    Wow. That's pretty awesome. I wish you lived nearby so my kid could swing a leg over it! Enjoy some happy trails with your little one!
    Only boring people get bored.

  11. #11
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    went out with him again today... and though the cranks are long, he wasn't quite eating his knee caps. pretty sure these are going to work.
    Last edited by biobike; 06-18-2014 at 02:26 PM.

  12. #12
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    cranks do see pretty big for a kid - I use 165mm cranks lol

    what is his leg length, about 80-85cm

    watch out for the rear freehub on the HDW2's they are not the most reliable.

    I've got the thorn cranks on my boys bike who is 9, 150mm ones.


    edit - how wide are the bars?

  13. #13
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    There goes the college fund!

  14. #14
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    nice rig, i just got my sona stock Trek superfly 24 and its around 23-24 pounds - HT of course, not a FS like yours. Funny i ended up getting the same rocket ron as you up front. its been a GREAT tire. Not many choices for good 24 inch tires, i think that is the best out there. BTW Trek (Bontrager) makes a really nice light tire that came stock with this build, i didnt like it up front but left it in the back. Its really light and nice rolling resistance. Traction is ok for the light kids

    For all those parents with 20 inch bikes wanting to go to 26, the jump can be too much. Kids dont want to all of a sudden be 6 inches higher off the ground, which happens on 26 inch bikes especially on 26 FS bikes. I have a sweet 26 FS rig waiting for my boy from his older brother but he likes his low to the ground Trek superfly disk 24 for now. Go figure i would have bet the house he would have liked the FS bike better

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