20" BMX Rims on a 20" Mountain Bike- Mtbr.com
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  1. #1
    mtbr member
    Join Date
    Oct 2018

    20" BMX Rims on a 20" Mountain Bike

    I have a 36h 20" BMX wheelset that I was thinking about putting on my son's 20" mountain bike. I know that I will have to swap out the hubs, but is there anything else that I have to to consider?

  2. #2
    mtbr member
    Join Date
    Jun 2006
    So basically going to take the BMX wheels apart to get the rims, then replace the rims on the MTB with those?
    Have you built any wheels in the past?

    Fitment wise you should be alright unless the BMX wheels are from certain sizes of race bikes, as Mini/JR models 20" rims are actually bigger diameter than 'adult' 20" rims and need specific tires of which there aren't many that would be all that good for MTB. Easiest way to tell is look at the size stamp on the tire - if it's metric, you should be good, if it's fractional, they're different. You said they're 36 hole though, so not likely to be race wheels to begin with and nothing to worry about.

    You may or may not be able to use the same spokes.
    Sinister Bikes
    Wraith Bicycles
    Sunday River Mtn Bike Park
    Wachusett Brewing Co.

  3. #3
    turtles make me hot
    Reputation: NYrr496's Avatar
    Join Date
    Sep 2008
    Check out Velocity Cliffhangers. Great 20" rim. Lace em to Bike Hub Store hubs.
    I like turtles

  4. #4
    mtbr member
    Join Date
    Oct 2018
    Great! Thanks for the suggestion

  5. #5
    mtbr member
    Join Date
    Jun 2011
    36 hole is typically a pro set and the normal 20 inch size. Just watch out, my front and rear wheel are different on my race bike. Front is lighter with no brake surface

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