Can I run mix sprockets chain size?

Discussion in 'General' started by assjuice cyrus, Sep 21, 2020.

  1. assjuice cyrus

    assjuice cyrus Well-Known Member

    Can I run a 420 front sprocket and a 415 rear sprocket with a 420 chain?
  2. Dave K

    Dave K DaveK über alles!

    You could I guess but why would you? You could end up dead.
  3. TurboBlew

    TurboBlew Registers Abusers

    not for
    Sabre699 likes this.
  4. Knotcher

    Knotcher Well-Known Member

    this. A chain bind at the wrong time could create a high side to end all high sides.
    SpeedyE likes this.
  5. skidooboy

    skidooboy supermotojunkie

    not just no... HELL NO!
    Sabre699 likes this.
  6. Wheel Bearing

    Wheel Bearing Professional low sider

    You can milk anything with nipples
  7. Dave K

    Dave K DaveK über alles!

    The door on a 1956 VW beetle or the swingingarm on a 1972 Norton Commando?
  8. Banditracer

    Banditracer Dogs - because people suck

    I can't believe you asked that. :Poke:
    Sabre699 and notbostrom like this.
  9. SirCrashAlot

    SirCrashAlot Well-Known Member crazy!
  10. Toadmeister00

    Toadmeister00 Well-Known Member

    I had a 415 front made for a DRZ125 minimoto project, and ran it with a couple of different 420 rear sprockets and a 420 chain. I did this just to figure out the gearing before having the proper 415 rears made. The pitch and pin diameters are the same between 415 and 420, the 415 stuff is just narrower. I'm not sure I'd try it on a triple digit speed 300/400 class bike, but I didn't give it a second thought on a 60mph mini.
  11. Knotcher

    Knotcher Well-Known Member

    Look, if we all listed the dumb shit we did/do on mini bikes...
  12. Toadmeister00

    Toadmeister00 Well-Known Member

    No kidding! The penalty for failure isn't nearly as severe, so caution is sometimes thrown to the wind.
  13. SPL170db

    SPL170db Trackday winner

    Gorilla George likes this.
  14. ChemGuy

    ChemGuy Harden The F%@# Up!

    this is guaranteed to happen if you do...

  15. Dave_SV

    Dave_SV Well-Known Member

    Looks like the pit bike adventure some lovely lass had during the last endurance round at PIRC...
  16. YamRZ350

    YamRZ350 Nicorette Dependent

    Ive seen it done a few times with 530 chain and 520 sprockets
  17. Boman Forklift

    Boman Forklift Well-Known Member

    When we ran RS concerted chassis with 65, 85, and 150R motors we did exactly this and so did most everyone else as far as I know. A friend found a place that made custom front sprockets and then we switched everything to 415.
  18. assjuice cyrus

    assjuice cyrus Well-Known Member

    This is what I'm being told but just doesn't seem right. All front sprockets i can find are 420. The chain that is on there now is 415. I gotta have the rears made and I need it by this weekend.

    I was told I could run a 420 front and and 415 rear with a 420 chain, but that just seems like disaster to me.
  19. Boman Forklift

    Boman Forklift Well-Known Member

    We did it for a couple years. Everything is the same except the chain is a little wider, so a little more side gap on the back sprocket.
  20. nigel smith

    nigel smith Well-Known Member

    Google PBI sprockets and then order a couple of 415 CR85 sprockets. Don't send your kid out on anything not as perfect as you can make it.

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