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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!


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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
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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
    Heads up Flyboy!!
    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
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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

  15. #15
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    nice on the stock Trek tire... light 24" not an easy find and the most important upgrade we parents can do for our children's cycling enjoyment. ie. lessen rotational weight - it's a moral obligation

    and agreed on the necessary 24" graduation to a 26"... a too big bike is counter productive to a little one garnering the required skills for the sport.

    buying a good used pimped out 24" isn't as big a cash layout as it appears. resell will recoup much of the investment. i bought a virtually new used Scott... took a bunch of parts laying around / off of my other bikes... scoured Pinkbike... hit up ebay Taiwan... and with the help of my uber bike mechanic Steve... created a machine that really hooked my kid and has helped him really enjoy the sport. nb. my guy wasn't that into biking, nor the strenuous nature of it all... this steed has him engaged and getting out there, sweaty and off his iPad!

  16. #16
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    Hi, could I ask the shock length and is it longer than the stock shock? Any issues with this? Also I assume the fork is for a 26" wheel set?

  17. #17
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    think the SID is a 4"... we've got it under inflated to keep it supple for a smaller persons weight and ability which makes it ride a little lower. and yes its meant for a 26" wheel but works real nice on a 24" setup. it's fantastic. you can find the SID carbons in the $250-300 range on ebay, etc.

    we actually were out today... our new home backs on to Cypress Mtn in West Vancouver and just started to explore the hood. wow. we're talking bike in bike out. and that bike is great for my 9 year old boy! definitely find the shock out there and mount it up. it's super light and pretty supple for an air shock. you'll be able to sell it for what you paid.

  18. #18
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    oh... and check out mtbr member "xc71" he deserves all credit for first doing up a high end Scott Spark Jr build. he's got an excellent thread on the subject.

  19. #19
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    Thanks for the info, I am also interested in the length of the rear shock and where you bought it, I can't seem to find the x-fusion in the smaller size? Cheers.

  20. #20
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    i believe the shock was specifically made for the Scott Spark RC Jr (which was fazed out in 2010 i think). it wasn't an aftermarket product. i upgraded my stock Jr to the RC spec'd X-Fusion. don't think there's any other option worth trying out there.

    call Brian @ Renegade 250-483-6677 - they're the Canadian / West Cdn distributors of X-Fusion if i remember it right. he had like 3 left or something when i called last year. shipped to me it was $220 and change. the US distributer has been drained of stock for quite a while. if that doesn't work get back ahold of me... i was given some number for a contact in Belgium that might have something - part# 210325 (Europe side?).

    ? 75mm stroke ? - 125mm eye-to-eye ? but might be off on those numbers

    its a good little shock - though the brackets that hold it on the Scott tend to over tighten causing it to bind. i just leave the bolts holding it to the frame finger tight and it does the job. xc71 did some ti-bolt washer thing with his or something like that... either way it makes for a real full suspension mtn bike. all the spring shocks for that size are fake-believe.

    only other 24" full suspension frame i've seen that could be built up xc/am capable is the...

    Lil Shredder Bikes

    really nicely done but'll cost a bit more to bring up to a worth build. pretty new on the market probably not many used for sale out there.

  21. #21
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    Like Biobike mentioned the older Sid carbon 80mm, 26" forks are an excellent upgrade on the 24" Spark/Scales. You have 3 benefits 1) approx. 1 lbs. lighter than 24" spring and air forks. 2) Being able to set rider sag and excellent suspension action. 3) Improves the Geo on the spark/Scales. By raising the headtube the bike steers better esp on faster corners. Much more stable on downhills, rockgardens, park features, etc.
    My son could climb some really steep hills and said there was no neg effects of the 26" climbing, he loved the fork mod. Keep in mind comparing the A to C on the stock 24" fork to the 26" Sid is not accurate due to fact that you will have rider sag on the Sid and most 24" spring forks barley move.
    Biobike is correct that the X-Fushion was stock on the Spark RC 24. 125mm length, 20mm stroke, 75mm travel.
    To get the rear suspension to function properly you need to do one of the following.


    "There is an issue with the shock bolts causing massive stichion. I bought Ti bolts from torontocycles. You have to make sure the shoulder (none threaded part ) of the bolt is correct. To get the correct shoulder length the bolt length will be way to long - simply cut off the extra threads to the correct length. You will also need the Ti low profile nylon locknuts for the bolt ends, this of course allows you to leave the bolts slightly loose with no chance of the nuts backing off. Check the rear end for any play/knocking from time to time. If there is, just turn the locknuts 1/8 of a turn and it will eliminate it.
    Another option is to apply a small amount of red locktite to the stock bolts so they don't back off."
    These pics show the low profile nylon Ti locknuts.
    Attached Thumbnails Attached Thumbnails Scott Spark 24 * bling build JR-img_0330_1.jpg  

    Scott Spark 24 * bling build JR-img_0328_1.jpg  


  22. #22
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    Awesome looking builds on here! "Santa" just brought my 8 yr old son a 3-4 year old Spark RC Jr 24 and I've been inspired to do some upgrades by what I've seen on the forum. I've got a light SID coming this week but can't get my head around the custom modifications needed for the rim brake. I've seen the 700 to 26" adapters, but can anyone share photos or a more detailed description of how they made rim breaks work with 24" wheels and a 26" SID? Thanks in advance!

  23. #23
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    This one was CNC machined but there are easier/cheaper versions out there.
    Attached Thumbnails Attached Thumbnails Scott Spark 24 * bling build JR-v%2520brake%2520adator%2520slots%2520r1.jpg  

    Scott Spark 24 * bling build JR-img_0316_1.jpg  

    Scott Spark 24 * bling build JR-img_0319_1.jpg  

    Scott Spark 24 * bling build JR-img_0332_1.jpg  


  24. #24
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    That is absolutely beautiful. I read with envy your account of getting those made up with a friend's CNC machine (I think it was your post...). Alas, no access to CNC router here. Will have to resort to a lower tech option or something commercially available. My back up plan is to put a disc brake up front, but I'd prefer to stay w/ rim if possible. Thanks for posting the photos. Anyone have a commercially available option? or backyard mod?

  25. #25

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