Hotrock 16 Build- Mtbr.com
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  1. #1
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    Hotrock 16 Build

    I thought I would share the Hotrock 16 I pieced together for my 5 year old. He bought the bike for $40 and was already starting to look a little big on it so I reconfigured it so the geo would work better and help it to last longer. I also wanted it to be a better trail bike. I think I have around $200 in parts. I think it may weigh no more than 1 lb heavier than stock. Most of the additional weight is from the 20" fork. We took it out today on some local green trails and he did great. The best upgrade was the 25T vs stock 28T sprocket combined with the longer pedals which allowed him to climb a lot easier.

    Upgrades
    • 25T sprocket
    • 5.5" 1 piece crank, drilled and shaved to save weight
    • 20" BMX fork, drilled for weight. If I could do it again I would have bought a trials fork because the BMX fork is 1lb more than stock.
    • 16" x 2.25" Vee Crown Gem tires, these cost me dearly because I had to pay $35 to have them shipped from the French Commencal website. There is no 16" tire selection within the US.
    • Ebay aluminum stem
    • Crupi 2" rise handlebar
    • Insight mini BMX seat



  2. #2
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    It looks like there is a rim brake installed, did you do that yourself or did it come with it? I don't think these bikes came with hand control brakes from the factory.
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  3. #3
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    I got as far as finding a 20" fork for my sons Hot rock. I've got a couple questions.

    what crank did you use? Is there a standard specification I should look for ordering something online?

    And what I'm realy curious about is the "drilled and shaved to save weight" process?
    is that a BMX thing?

    Thanks, Woody

  4. #4
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    A 5 year old is big enough for a 20" If you are going to spend $200 on parts, why not just watch craigslist or FB marketplace for a Trek Superfly 20 or similar. I bought one for my 5yo for $150 on FB. Seems that or $200 is the going rate.

  5. #5
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    Quote Originally Posted by Marshfly View Post
    A 5 year old is big enough for a 20" If you are going to spend $200 on parts, why not just watch craigslist or FB marketplace for a Trek Superfly 20 or similar. I bought one for my 5yo for $150 on FB. Seems that or $200 is the going rate.
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  6. #6
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    Quote Originally Posted by bark-eater View Post
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    Haha.

    The fun is watching your 5year old actually be able to go UP the hill because he can shift.

    Seriously though. By this point, if they are still in good condition, they probably have been upgraded nicely. The one I bought has upgraded BB and 140mm cranks as well as a Rapidfire shifter and XT V-brakes.

    Regardless, it's nice to see people keeping quality older kids bikes in nice shape so they can continue to be passed around to get kids pumped about riding.

  7. #7
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    Ok you win.

  8. #8
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    Quote Originally Posted by bark-eater View Post

    And what I'm realy curious about is the "drilled and shaved to save weight" process?
    is that a BMX thing?
    No, it's mainly a MTB dad-who's-a-bike-geek thing.
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  9. #9
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    Quote Originally Posted by slapheadmofo View Post
    No, it's mainly a MTB dad-who's-a-bike-geek thing.
    Haha. Its a slippery slope.


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