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  1. #1
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    Got a friend who has a bike with 6" disk brakes and want's to change the rotor to 8". Is it possible to change the rotor while keeping the rest of the brake intact? Or does he need to get a whole new disk brake set for a bigger rotor? I'm assuming he needs to get a new 8" brake set but I dont own any disk brake bikes at the moment so i wouldn't have a clue!

    Thanks for help.

  2. #2
    Senior Member Drunken Chicken's Avatar
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    Quote Originally Posted by blue_neon
    Got a friend who has a bike with 6" disk brakes and want's to change the rotor to 8". Is it possible to change the rotor while keeping the rest of the brake intact? Or does he need to get a whole new disk brake set for a bigger rotor? I'm assuming he needs to get a new 8" brake set but I dont own any disk brake bikes at the moment so i wouldn't have a clue!

    Thanks for help.
    I think all he needs is an adapter, and then he's golden.
    2005 Ironhorse 7.3
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  3. #3
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    Normally all that is needed is the 8 inch disk and the adapter. Everything else will work fine. You may have to get some shims to align the caliper to the rotor since the adapter may not position the caliper perfectly and the adjustment range may need help. It really isn't a big deal, takes maybe 15-20 minutes to do the swap.
    Toybox: Litespeed Tuscany & Niota

  4. #4
    The Rabbi seely's Avatar
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    Quote Originally Posted by motomickey
    Normally all that is needed is the 8 inch disk and the adapter. Everything else will work fine. You may have to get some shims to align the caliper to the rotor since the adapter may not position the caliper perfectly and the adjustment range may need help. It really isn't a big deal, takes maybe 15-20 minutes to do the swap.
    Shims? What? When you remove and reinstall a caliper, of course you are going to have to realign it to the disk however, I fail to see a need for shims if you know what you are doing and its a non-Shimano brake. For Hayes and Avid you just need a 8" mounting bracket and an 8" rotor. All their calipers up to a 10" rotor are the same.
    commuter turned bike mechanic turned commuter (also a Velocity USA employee, but this is my personal account)

  5. #5
    likes to ride bikes
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    Can anybody find a link for these adapters? Preferably for Avids?

  6. #6
    Local Genius
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  7. #7
    blithering idiot jhota's Avatar
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  8. #8
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    Quote Originally Posted by Drunken Chicken
    I think all he needs is an adapter, and then he's golden.
    A word of warning though. His fork may not be capable of handling the increased forces of the 8" rotor.

  9. #9
    Chopped Liver Dannihilator's Avatar
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    Quote Originally Posted by willtsmith_nwi
    A word of warning though. His fork may not be capable of handling the increased forces of the 8" rotor.
    Ditto, also the frame may not be designed for an 8" rotor either.
    Strike like an eagle and sacrifice the dove.
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  10. #10
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    Thanks for replies. His fork is a Suntour Magnesium to my knowledge, would this be 8" compatible?

  11. #11
    The Rabbi seely's Avatar
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    Sweet mother of God, no. Unless its some Suntour I have never seen before, no no no no no.
    commuter turned bike mechanic turned commuter (also a Velocity USA employee, but this is my personal account)

  12. #12
    likes to ride bikes
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    how about a dj3?

  13. #13
    Chopped Liver Dannihilator's Avatar
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    Quote Originally Posted by TroyLeeRacer199
    how about a dj3?
    If it's the 20mm version it should be ok, if the QR version, then no.
    Strike like an eagle and sacrifice the dove.
    Words and Stuff.

  14. #14
    I drink your MILKSHAKE Raiyn's Avatar
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    Quote Originally Posted by blue_neon
    Thanks for replies. His fork is a Suntour Magnesium to my knowledge, would this be 8" compatible?
    Gotta back seely on this one.
    No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! A thousand more times NO!

  15. #15
    Just Ride
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    I think we get the point Raiyn...

  16. #16
    I drink your MILKSHAKE Raiyn's Avatar
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    Quote Originally Posted by sS-bEn
    I think we get the point Raiyn...
    Really? That's good, because I was trying to show a bit of restraint.

  17. #17
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    Raiyn - you posted 'No' 326 times, and 'NO' 1 time. You show no signs of restraint .

    I have another fork for the '6" to 8" changeover'... Marzocchi MZ-3? Possible?


  18. #18
    Chopped Liver Dannihilator's Avatar
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    Quote Originally Posted by blue_neon
    Raiyn - you posted 'No' 326 times, and 'NO' 1 time. You show no signs of restraint .

    I have another fork for the '6" to 8" changeover'... Marzocchi MZ-3? Possible?


    Nein.
    Strike like an eagle and sacrifice the dove.
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  19. #19
    I drink your MILKSHAKE Raiyn's Avatar
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    Quote Originally Posted by blue_neon
    Raiyn - you posted 'No' 326 times, and 'NO' 1 time. You show no signs of restraint .
    I was planning on doing an entire page of them but held back. I kept them all at normal text size to boot

  20. #20
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    Quote Originally Posted by KonaRider24
    Nein.
    Habe Zustimmung, dunke für Ihre Hilfe, ich nie gewusst, dass Sie Deutsch sprechen könnten?
    Last edited by blue_neon; 09-14-05 at 02:29 AM.

  21. #21
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    Cool, well it looks like some of the 'cheaper' forks arn't compatable.

  22. #22
    Senior Member Drunken Chicken's Avatar
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    Let me guess: RST Gila - NO NO NO?
    2005 Ironhorse 7.3
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  23. #23
    Just Ride
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    Quote Originally Posted by Drunken Chicken
    Let me guess: RST Gila - NO NO NO?
    I'd say so.

  24. #24
    Senior Member Drunken Chicken's Avatar
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    Quote Originally Posted by sS-bEn
    I'd say so.
    Damn! How come? Is it that the fork will have play in it? Will it snap? 'Cause I already have a front Juicy 5 with 8" rotors.
    2005 Ironhorse 7.3
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  25. #25
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    Quote Originally Posted by Drunken Chicken
    Damn! How come? Is it that the fork will have play in it? Will it snap? 'Cause I already have a front Juicy 5 with 8" rotors.
    Yes you will crash and burn, crash and burn good .

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