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  1. #1
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    Been a busy fall/winter so far -- (2) racing bike builds

    After the last change to the Hotrock 16, I should be done for a while on their street bikes. Time for race bikes! I've been collecting parts and researching the heck out of things over the last couple months, and have their builds just about done now.

    I'm still waiting for the grips to come in. I have a pair of KMC X10SL chains to put on once I get the gear ratios dialed in.

    Picked this up for $200 on Craigslist for my 4-year old.



    Picked this up for my almost-6-year old. Supercross Envy v3 mini.



    Picked up this Answer Anarchy Gromit Jr. for the parts, $275.



    Much better with all those god-awful stickers removed!










  2. #2
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    NIce!
    ELEVATE CYCLES | FTW FACTORY RACING | ODI | NEMA | 661| AZONIC | SPY

  3. #3
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    Awesome. Lookin FAST!

    Is that Answer frame steel?
    Sinister Bikes
    Wraith Bicycles
    Sunday River Mtn Bike Park
    NEMBA
    Wachusett Brewing Co.

  4. #4
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    Nope, it's "100% 7000 Series super matrix alloy with post-weld heat treating" according to the specs. 2.1 lbs. Be a while before they grow into that frame.

  5. #5
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    Both bikes look fantastic Dave. What size cranks id you end up going with? I'm guessing a micro 18" and mini?

  6. #6
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    Thank you! They are both 20" wheeled minis, but the Supercross is a little larger. Those pink Turn3 cranks on the SX are 130s, and the Speedlines on the GT are 125 if my memory serves correctly.

  7. #7
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    I know it's a mountain biking forum but I gotta update this anyways! Ready to race...


    I need some white wheels!











    Wife had a little fun with the camera.











  8. #8
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    The bikes look awesome. Good starting gear for a 4 year old is 34 - 15. For a 6 year old try 35 - 15. This is assuming they are riding 11/8 tyres. To compare ratios and tyres check out the gear calculator on bmxultra
    Gear Calculator | bmxultra.com
    Look for around 45 roll out for the 4 year old and 46 to 47 for your 6 year old.

  9. #9
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    Quote Originally Posted by silvascape View Post
    The bikes look awesome. Good starting gear for a 4 year old is 34 - 15. For a 6 year old try 35 - 15. This is assuming they are riding 11/8 tyres. To compare ratios and tyres check out the gear calculator on bmxultra
    Gear Calculator | bmxultra.com
    Look for around 45 roll out for the 4 year old and 46 to 47 for your 6 year old.
    Current setup:

    4 y/o
    40/16 on ITS Mk2 1-1/8" = 50.25"

    6 y/o
    39/15 on Vee Mk3 1-1/8" = 52.26"

    I have other chain rings to play with.

    I had a reason at the time for setting it up like that, I'll have to dig back through my notes to see what it was.

  10. #10
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    Wow, that's big gearing for sprockets. I know of adult pro men who train on 53 to 54 roll out. I race on 54. Smaller gear = faster out of the gate, teaches then to spin and less stress on the hips and lower back. It is track dependant though. On a 5 m start hill and a overall downhill track people tend o ride up a couple of inches.

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