Specialized Grom Hit FSR build- Mtbr.com
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  1. #1
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    Specialized Grom Hit FSR build

    I picked up a used 2008 Specialized Grom Hit FSR for my 7 years old son last fall. Although it was in excellent condition, there were a few issues with the bike:


    • The color! My son wasn't a big fan of purple!
    • The weight, which was a little over 33.5 pounds.
    • The gearing. The Grom Hit is designed for DH and had a 34t chainring and 11-32t cassette.


    So the goal with this build was to make the bike a bit more versatile, by reducing the weight and improving the gearing for a 7 years old. Here's the bike when I picked it up:

    Specialized Grom Hit FSR build-img_1025.jpg

    I took it apart entirely and got it powder coated flat black:

    Specialized Grom Hit FSR build-img_1031.jpg

    Specialized Grom Hit FSR build-img_1086.jpg

    Reassembled the frame, with all new bearings. The old one were actually still in great shape, but I damaged a few when removing them prior to sending the frame for powder coating:

    Specialized Grom Hit FSR build-img_1121.jpg

    I rebuilt the bike using a combination of spare parts I had laying around and new or used parts I got good deals on. I also reused the seat, cranks and brakes from the original bike. Here are the main components I replaced:


    • RockShox Reba Race dual air
    • Shimano XT M8000 11 speed shifter, rear derailleur and 11-42t cassette
    • Race Face 30t narrow-wide chainring
    • Stans ZTR Crest 24 holes laced to Novatec D771SB/D772SB hubs.


    The Truvativ Howitzer Blaze cranks were initially 165mm. I shortenned them to 140mm, reducing the weight by 72 grams at the same time:

    Specialized Grom Hit FSR build-img_5843-2.jpg

    Final weight of the bike is a hair under 25 pounds. Here's the final result:

    Specialized Grom Hit FSR build-img_1485.jpg
    Specialized Grom Hit FSR build-img_1489.jpgSpecialized Grom Hit FSR build-img_1490.jpgSpecialized Grom Hit FSR build-img_1492.jpgSpecialized Grom Hit FSR build-img_1493.jpgSpecialized Grom Hit FSR build-img_1483.jpg

    Here's the bike next to his Trek Superfly 20, for size comparison:

    Specialized Grom Hit FSR build-img_1496.jpg

  2. #2
    Bikes in jeans
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    That's amazing, I'd have no shame riding that myself (purple or black).

  3. #3
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    Can I ask what's the weight of Superfly 20 ?
    2012 Trek Slash 9
    2012 Trek Session 9.9

  4. #4
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    Quote Originally Posted by CaRaBeeN View Post
    Can I ask what's the weight of Superfly 20 ?
    I don't have the exact weight but I believe it's around 18 pounds.

  5. #5
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    Hi, nice build btw! I am working on the same bike for my friend's kid. Just wondering since the original rear hub that comes with the Gromhit is 135mm, how did you fit the 142mm Novatech on it? I am thinking of getting a pair of 24in Spank Spoon for him and they come with 142mm hub. Please advise.

  6. #6
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    It'm using the QR 135mm version, so it fits without issues.

  7. #7
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    Hi

    This is my rebuild of the gromhit. Did the paintjob, fork, rear shock, paint, wheels, tyres brakes, gears and more.

    Used a fox rp23 rear shock lowered @100mm, rs1 100mm air fork, shimano saint brakes.

    Nice ride and my 10 year olds favorite bike

    12.5 kilos




    Specialized Grom Hit FSR build-5f365420-cf58-4b9f-956e-60d8cde71a12.jpgSpecialized Grom Hit FSR build-ea005d2c-77ef-440c-89e3-1d84e4d8c8a5.jpgSpecialized Grom Hit FSR build-77f15cd1-7855-4ce5-ba43-73abefe52f12.jpg
    Attached Thumbnails Attached Thumbnails Specialized Grom Hit FSR build-21f4eede-2ee8-413e-941d-6b5235286aea.jpg  

    Specialized Grom Hit FSR build-df00a983-dd52-4994-a9f5-d60c07c6b9cf.jpeg  

    Specialized Grom Hit FSR build-1b1b1268-b691-4bf8-86c0-de0826191de1.jpg  

    Specialized Grom Hit FSR build-77dca066-7ab8-4985-8443-ff4f4dacd99d.jpg  


  8. #8
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    Quote Originally Posted by Pirmin View Post
    Hi

    This is my rebuild of the gromhit. Did the paintjob, fork, rear shock, paint, wheels, tyres brakes, gears and more.
    Nice... Sik paint job!

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