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  1. #1
    [CTRL Z] ponchotempest's Avatar
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    140mm rear disc, am I the only one?

    So I just set up my hardtail with 160/140 front/rear BB7 brakes, and after one ride I am very happy. After a short break-in the 140mm rear seemed great even with a real grippy 2.1" tire. Is anyone else running 140 rotors with mountain calipers?

    Last edited by ponchotempest; 05-16-09 at 06:36 PM.

  2. #2
    ed
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    I would never admit to it if I was...I'd never live that one down.

  3. #3
    [CTRL Z] ponchotempest's Avatar
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    Well before i was using 203/160 front/rear with an '01 SID fork. That was a little too flexy for 203...

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    ed
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    So you're saying now you have plenty of braking power...but not so much as to flex the dickens outta the SID?

    I've been told that some 140mm rear rotors are much, much quieter than some 160mm rear rotors...on some frames, and if you don't live in an area with a ton of DH where you'll make it glow...you may as well go with the smaller ones.
    Last edited by ed; 05-16-09 at 04:40 PM.

  5. #5
    [CTRL Z] ponchotempest's Avatar
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    I have more braking power than grip in the rear it seems. The 160's weren't to noisy before except for the occasional squeal when muddy. I'll have to go for a nice muddy ride with the 140 to test that out.

    With a 203mm rotor that SID would flex so much that the brakes would rub while cornering on pavement. That was quite the overkill.

  6. #6
    bikes are sexy Lebowski's Avatar
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    im running the 185/160 but i want to go to 185/185. it bugs me that my rear rotor is smaller than the dork disc on my cassette
    [2010] Specialized P3 - [09] Origin8 Scout 29er - [08] Specialized Epic Comp - [08] Specialized Allez - [06] - Specialized SX Trail II - (((In Pieces - '08 Jamis Parker -- '07 specialized Hardrock Sport -- 2005 KHS DJ200)))

  7. #7
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    Quote Originally Posted by ponchotempest View Post
    So I just set up my hardtail with 160/140 front/rear BB7 brakes, and after one ride I am very happy. After a short break-in the 140mm rear seemed great even with a real grippy 2.1" tire. Is anyone else running 140 rotors with mountain calipers?
    I use 140mm calipers, but on a smaller wheel - not on a 26" wheel.

    Just curious as to why you opted for a 140 at the rear instead of the usual 160. Did you do it so that it would minimize rear wheel lock? If you're planning to run "skinnier" tires than the 2.1 on the rear, this makes even more sense.

    A smaller rotor would theoretically be more likely to overheat during prolonged braking, but if you hardly do that in your style of riding, then a 140 would probably hold-up as well as a 160 rotor...

    Out of intererst, is your 140 an original Avid rotor? I'm interested in the rotor shape... any pics?


    .
    Quote Originally Posted by dminor View Post
    Like clever mice, if there is a any crevice to exploit, a chain will find room to jump and derail; you can count on it.

  8. #8
    [CTRL Z] ponchotempest's Avatar
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    It still locks up pretty easy with the 140, but obviously not quite as easy as 160. I'm not really worried about overheating anything on this bike, it only weighs about 25 lbs or so.

    Its an Avid Roundagon rotor, but i'm not sure if they sell the 140mm rotor with a mountain caliper as a package. I could be mistaken, though.

  9. #9
    [CTRL Z] ponchotempest's Avatar
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    Quote Originally Posted by Lebowski View Post
    im running the 185/160 but i want to go to 185/185. it bugs me that my rear rotor is smaller than the dork disc on my cassette
    Naw, it's bigger than my 32t 1st gear

  10. #10
    ed
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    Quote Originally Posted by Lebowski View Post
    im running the 185/160 but i want to go to 185/185. it bugs me that my rear rotor is smaller than the dork disc on my cassette
    Invest in a 0mm dork disc.

  11. #11
    ed
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  12. #12
    ****** (can I say this?)
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    ^^^^
    We really need to stage an intervention.
    “Speed has never killed anyone, suddenly becoming stationary... that’s what gets you.”- Jeremy Clarkson

  13. #13
    ed
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    I had my own reasons.

  14. #14
    [CTRL Z] ponchotempest's Avatar
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    thats 140 rear?

    Heres mine before with the big brakes:

  15. #15
    ****** (can I say this?)
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    Quote Originally Posted by chelboed View Post
    I had my own reasons.
    It just seems like you came 180 compared with 6 months ago

    But I really do like your bike. Whatever works, right?
    “Speed has never killed anyone, suddenly becoming stationary... that’s what gets you.”- Jeremy Clarkson

  16. #16
    use your best eye kenhill3's Avatar
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    Quote Originally Posted by ponchotempest View Post
    that SID would flex so much that the brakes would rub
    Your SID was flexy? Unbelievable.
    "I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.

  17. #17
    use your best eye kenhill3's Avatar
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    Ed-

    I know you're a big fellah, but.............there's something wrong with your seatpost..........it's bent.
    "I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.

  18. #18
    unofficial roadie DirtPedalerB's Avatar
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    you need some more cable ties on that top tube
    I only pedal uphill.

  19. #19
    Senior Member
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    Quote Originally Posted by kenhill3 View Post
    Your SID was flexy? Unbelievable.
    In general, quick-release forks with 10mm drop-outs should be fitted with 185mm rotors as max. Larger 203mm rotors are better suited for forks with 20mm thru-axles.
    Quote Originally Posted by dminor View Post
    Like clever mice, if there is a any crevice to exploit, a chain will find room to jump and derail; you can count on it.

  20. #20
    use your best eye kenhill3's Avatar
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    Sids have never been known to be flexy.
    "I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.

  21. #21
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    i have one question. How is the pad placement on the disk, are they fully contacting the disk or partially?

  22. #22
    Official Website Waterboy born2bahick's Avatar
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    A friend with an 08 Epic, "Dealer Edition" in red. has a 140 rear. It's got all the stopping power a rear brake needs in this area.

  23. #23
    ed
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    +1

    Oh my crap...I woke up...and my sig... BWAHAHAHAHA!

    That's classic!

    Quote Originally Posted by DirtPedalerB View Post
    you need some more cable ties on that top tube
    Yah...it's a bit of overkill.
    Last edited by ed; 05-17-09 at 11:31 AM.

  24. #24
    Fool O' crap sscyco's Avatar
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    I ran a 140 (XTR centerlock) on the rear of my old Litespeed - rear disk conversion - it was the only disk that would fit my frame. Ran it for a year with no issues.

  25. #25
    [CTRL Z] ponchotempest's Avatar
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    Quote Originally Posted by rhyno View Post
    i have one question. How is the pad placement on the disk, are they fully contacting the disk or partially?
    They contact the disc properly as long as you have the correct adapter.

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