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  1. #1
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    4 piston calipers

    I'm thinking of switching to a 4 piston caliper on my front break. I currently have a standard XT break setup, front & back with 160 mm disc rotors.

    Want to have a 4 piston caliper at front with a 203 mm disc rotor. Any suggetions on brand/type? The new Hayes Stroker Ace and Hope m4 look great
    Any other alternatives?
    Mosso TI frame, RockShox REBA Team fork, Shimano XT package, XTR M975 wheels w/centerlock discs, Xpedo TI pedals.

  2. #2
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    Just try using a 203mm rotor with your current brake to start with. Changing rotor size will have a much bigger effect on power than changing caliper.

    Failing that Avid Codes, Shimano's new Saint and the old XT-755 caliper are all four piston.

  3. #3
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    It's BRAKE, not BREAK.

    And the m4 uses the same pads as the 755, if that means anything. However, unless there's something wrong with the 755's, why not just go with a bigger rotor?

  4. #4
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    Are these going on a DH bike?

    If I put my Saints on my XC hardtail, I think I'd end up hurting myself.

    I question the setup or maintenance of your XTs if they aren't feeling up to the task.

  5. #5
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    Quote Originally Posted by Jerk_Chicken
    It's BRAKE, not BREAK.

    And the m4 uses the same pads as the 755, if that means anything. However, unless there's something wrong with the 755's, why not just go with a bigger rotor?
    By the way he writes that he wants 4 piston brakes, I'm guessing OP doesn't have m755s to begin with, probably m765s.

  6. #6
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    If you want to upgrade just the caliper, you can only use a Shimano caliper.

    I would suggest a bigger rotor and a different pad compound first (assuming that the fork allows for a bigger rotor).

  7. #7
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    Yeah, BRAKE and not break, sorry :-D

    I'm thinking of a 4 piston caliper just for the look of it ;-) It looks sooo cool. My XT calipers are working just fine, but I might just go for a 203 mm rotor up front. Will look cool as well... Thanks for all the replys!
    Mosso TI frame, RockShox REBA Team fork, Shimano XT package, XTR M975 wheels w/centerlock discs, Xpedo TI pedals.

  8. #8
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    Quote Originally Posted by birkebeiner
    Yeah, BRAKE and not break, sorry :-D

    I'm thinking of a 4 piston caliper just for the look of it ;-) It looks sooo cool. My XT calipers are working just fine, but I might just go for a 203 mm rotor up front. Will look cool as well... Thanks for all the replys!
    Ok, time for me to unsub.

  9. #9
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    Quote Originally Posted by birkebeiner
    I'm thinking of a 4 piston caliper just for the look of it ;-) !
    I think XT 755 w/ their polished outer face is the sexiest design ever.

  10. #10
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    If you don't need the extra power, why add the unnecessary weight?

  11. #11
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    You, apparently don't understand how sexy a pair of well designed calipers can be.

  12. #12
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    I have a set of 755s. Yeah, they're cool. But there are two piston designs that work just as well though. And some are lighter too.

    And he's just thinking about getting a larger rotor... no point if he has enough braking power. It's just going to add rotational and unsprung mass. As well stress the fork more. It'll be closer to the ground and more likely to get banged up.

    Form follows function.

  13. #13
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    Yeah I don't like the 203mm rotors on bikes very much. They're too big they look like cutouts rather than precision equipment. Sexiest combo would be m755's w/ 160mm rotors.

  14. #14
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    XT M755 are just sexy in the front with 180mm rotors.

    102_1559.JPG
    If I disagree with you, it's because you are wrong.

  15. #15
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    Are you putting these on a Formula 1 car? Overkill in nearly every situation!

  16. #16
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    Quote Originally Posted by sundowner
    XT M755 are just sexy in the front with 180mm rotors.
    Naw, makes the brake tract look too narrow. I maintain 160mm rotors are sexier.

  17. #17
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    Deja Vu?

  18. #18
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    Quote Originally Posted by vk45de
    Naw, makes the brake tract look too narrow. I maintain 160mm rotors are sexier.
    Its not about how it looks which it pretty cool, its all about performance and a 180 rotor in the front does that. 203 is over kill though.
    If I disagree with you, it's because you are wrong.

  19. #19
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    Quote Originally Posted by RIfreeDE
    Are you putting these on a Formula 1 car? Overkill in nearly every situation!
    Only if you ride it like a road bike or the rider is small and lite.
    If I disagree with you, it's because you are wrong.

  20. #20
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    Thanks everyone for the inputs. Did go for a larger disc rotor, Shimano XT 203mm The stopping power with the XT M775 calipers and 203 and 160 mm rotors f&b is just amazing! I guess a 4 piston caliper would be a bit overkill

    Did test this setup today and works just fantastic!

    The picture of the setup is not so great though...
    Attached Images Attached Images
    Mosso TI frame, RockShox REBA Team fork, Shimano XT package, XTR M975 wheels w/centerlock discs, Xpedo TI pedals.

  21. #21
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    M4s are awsome

    I'm running M4s on my FXR and they not ony work great, they look as cool as any brakes I've ever seen.
    Attached Images Attached Images
    Last edited by slowrider; 06-02-2009 at 07:58 PM. Reason: wrong pic

  22. #22
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    Holysh!t, that's a frigging big @ss spring

  23. #23
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    Quote Originally Posted by slowrider
    I'm running M4s on my FXR and they not ony work great, they look as cool as any brakes I've ever seen.
    The brakes looks nice. Any closeup photos?
    Mosso TI frame, RockShox REBA Team fork, Shimano XT package, XTR M975 wheels w/centerlock discs, Xpedo TI pedals.

  24. #24
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  25. #25
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    yup

    11.25" eye to eye; and the 08/09 is about an inch longer. Sucks trying to find an airshock to fit tis thing.
    Quote Originally Posted by vk45de
    Holysh!t, that's a frigging big @ss spring

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