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  1. #1
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    26" wheels on 24" boys frame (Specialized Hotrock)?

    I inadvertently bought a Specialized Hotrock frame (X Large, 2003'ish), thinking it was a 26" frame. It's a boys 24" frame.

    I compared the Hotrock frame to a 26" frame..the clearance for rear-tire is the same. However, the V-brake studs for 24" frame sit closer to rear dropout. Will V-brakes still "fit"?

    if I put a 26" fork on this frame, will this disrupt the geometry?
    Attached Thumbnails Attached Thumbnails 26" wheels on 24" boys frame (Specialized Hotrock)?-00a0a_byxsjtusn42_600x450.jpg  


  2. #2
    rebmem rbtm
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    Have you put a 26" wheel on the back to see how well it fits.

  3. #3
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    Run away!!!!
    You'll have to fab some adapters for the rear brake posts to make them fit if you can even get the wheel in there.
    I made my son a 46er by putting a 26" fork and wheel on a 24" frame. Works for him offroad.

  4. #4
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    That's a good idea. Back in the day Cannondale and maybe some others made regular mountain bikes with a 24" rear and a 26" front.

    The brake in the rear is going to be a serious problem, if the wheel and tire even fit back there. But a 46er would be simple.

  5. #5
    I Tried Them ALL... Moderator
    Reputation: Zachariah's Avatar
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    Sell it, man. A 26" fork will indeed alter the geometry and possibly hurt the frame. eBay will bring you the highest dollar for that bike, since most buyers for quality, 24" boys bikes are parents. Craigslist buyers are mostly looking for Walmart bikes, under $200.
    "The mind will quit....well before the body does"

  6. #6
    Si Vis Pacem, Para Bellum
    Reputation: CannondaleF9's Avatar
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    I agree, sell it and buy a "Hardrock".
    Big Wheels Keep On Rolling

    Forth Eorlingas!

  7. #7
    gobsmacked Moderator
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    26" wheels on 24" boys frame (Specialized Hotrock)?

    If the wheel fits back there, Paul makes some bmx brakes that could work. Mavic once upon a time had an adapter as well.
    Wanted: WTB rollercams and brake bridges

  8. #8
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    Quote Originally Posted by cobba View Post
    Have you put a 26" wheel on the back to see how well it fits.
    It will fit..the v-brake lugs (distance to rear dropouts) are the only difference.

    As others have pointed out, I can figure out a rear brake solution (BMX brakes, adapters, etc)

    Frame is a real beauty, got it for only $25 (included BB, front derailleur, seatpost).

  9. #9
    FriendlyNeighborhoodMTBer
    Reputation: kabayan's Avatar
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    Here is something similar:
    Need your V-brake expertise: 26in wheel in 24in frame
    Please post up the make and model of the rear brake if you find one that works.
    If you can't play, display.

  10. #10
    gobsmacked Moderator
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    26" wheels on 24" boys frame (Specialized Hotrock)?

    Have you tried the Paul's? You can use them for 26" bikes with 700c wheels. The brake pads slide up and down on the arms.

    http://www.paulcomp.com/motobmx.html
    Wanted: WTB rollercams and brake bridges

  11. #11
    gobsmacked Moderator
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    26" wheels on 24" boys frame (Specialized Hotrock)?

    Here's some more info.

    http://forums.mtbr.com/650b-27-5/26-...er-684165.html

    And I've been hunting for these forever if anybody ever sees one:26" wheels on 24" boys frame (Specialized Hotrock)?-imageuploadedbytapatalk1375296474.204012.jpg
    Wanted: WTB rollercams and brake bridges

  12. #12
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    Incredibly, I put on some rims/tires & the Deore V-brakes fit OK. I'm nearing completion on the build using Deore LX crank, 9 speed trigger shifters, 9 spd cassette in rear, front RockShox shock (from '99 Specialized Rockhopper).

    I bought it from a guy who said it was 26", but this bike model is for boys 24"...??!!

  13. #13
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    I finished the build yesterday (3x9 drive), & took it for a test-ride around East LA..ridess great!

    The rear V-brakes seem to work fine, the pads sit lower on the arm (since the boys v-brake lugs are closer to rear dropout). I still can't figure out why the Deore v-brake arms "fit". The above responses claim (correctly) an adapter is needed.

    26" wheels on 24" boys frame (Specialized Hotrock)?-20130804_004335a.jpg

    from '99 Specialized Rockhopper A1:

    - Fork & headset is RockShox Jett
    - Ritchey wheel set

    STX crank from Craiglist
    seat from Craigslist
    9-speed SLX shifters from Craigslist
    brake levers & Deore V-brakes from Craiglist
    stem & 31.8 bar from Craigslist
    rear derailleur (Forte 9 speed), from PerformanceBike.com
    front derailleru Deore, from Craigslist
    KMC 9 speed chain (new, from Blueskycycling)

  14. #14
    mtbr member
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    That frame looks like it was made for 26". Wierd.

  15. #15
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    Quote Originally Posted by smilinsteve View Post
    That frame looks like it was made for 26". Wierd.
    It's an XL size, I compared the "clearance" for the rear tire/wheel with a 26" frame -- identical. It's just the v-brake lugs that are "set closer" to rear dropouts for a 24" frame. The v-brake calipers are thus set more "inboard" (on each side), meaning that bigger tires could have clearance issues..

  16. #16
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    Quote Originally Posted by chimpanzee00 View Post
    I finished the build yesterday (3x9 drive), & took it for a test-ride around East LA..ridess great!




    The rear V-brakes seem to work fine, the pads sit lower on the arm (since the boys v-brake lugs are closer to rear dropout). I still can't figure out why the Deore v-brake arms "fit". The above responses claim (correctly) an adapter is needed.

    Click image for larger version. 

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    from '99 Specialized Rockhopper A1:

    - Fork & headset is RockShox Jett
    - Ritchey wheel set

    STX crank from Craiglist
    seat from Craigslist
    9-speed SLX shifters from Craigslist
    brake levers & Deore V-brakes from Craiglist
    stem & 31.8 bar from Craigslist
    rear derailleur (Forte 9 speed), from PerformanceBike.com
    front derailleru Deore, from Craigslist
    KMC 9 speed chain (new, from Blueskycycling)
    I dont really like it. looks likea 26

  17. #17
    Rollin 29s
    Reputation: isleblue65's Avatar
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    Wrong thread
    Attached Thumbnails Attached Thumbnails 26" wheels on 24" boys frame (Specialized Hotrock)?-image.jpg  

    Whoever invented the bicycle deserves the thanks of humanity.
    - Lord Charles Beresford

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