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  1. #1
    veggie
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    Convince me - 200 or 185 REAR brake rotor?

    I am probably ordering new brakes soon. I have decided what brakes I want already. What I haven't decided is the size of the rear rotor. Feel free to share why you think either one is better. It will be on a bike that does everything from all mountain to downhill. I don't care about the weight difference.
    Thanks!

  2. #2
    bike rider
    Reputation: Lelandjt's Avatar
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    For DH definitely 200mm for max heat management and because a DH tire will have enough grip to still have good feel with the 200's power. For AM I like 185mm because the tires used lock up too easily with a 200. They still have good enough heat capacity for most descents.
    Keep the Country country.

  3. #3
    Five is right out
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    What do you weigh, how long are your downhill runs, do you use good brake technique or do you drag your brakes? What brakes are you using?

    Without this info, any suggestions are completely random.

  4. #4
    Glad to Be Alive
    Reputation: SHIVER ME TIMBERS's Avatar
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    Quote Originally Posted by womble View Post
    What do you weigh, how long are your downhill runs, do you use good brake technique or do you drag your brakes? What brakes are you using?

    Without this info, any suggestions are completely random.
    yep the key is weight......if you are over 180 get the 203's
    the trick is ENJOYING YOUR LIFE EACH DAY, don't waste them away wishing for better days

  5. #5
    veggie
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    I weigh 170 without gear.
    Sustained downhill maybe 15 minutes. Mostly downhill up to an hour.
    I am getting better at using pretty good brake technique. I like to use the rear to scrub or control speed. I try not to skid, unless I'm playing around.
    I'll be using Avid Code R brakes, but I don't want this to get into a brake discussion.
    Tires are Intense 909 dual ply grippy awesomeness.

    I like the power of 200's, my fear is possibly locking up the rear too easily. I've ridden juicy 7 200mm front and rear. That was fine. 200 front 185 rear elixir 5 is what is on my bike right now and feels pretty good. But if I can have more power/heat resistance with still having control I'm all for it.

    Thanks for the replies so far

  6. #6
    mtbr member
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    I'm over 200 and have never had an issue with 180mm rotors in the back, even on 20 min brake burning descents.... I say either is fine.

  7. #7
    mtbr member
    Reputation: JefedelosJefes's Avatar
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    200. Why would you not want more braking power? The only bennefit to 185 is to save like 20 grams... who cares, it's a DH bike.

  8. #8
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    I keep all my rotors at 203mm so if i bend one I can take it from another bike.

  9. #9
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    180 mm will make you faster! Scarry fast.
    The guy yo' momma "act" like she don't know!

  10. #10
    Perpetual Hack
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    Depends upon what you are looking for and the terrain you are riding.
    I am about 220 on bike, and have a 203 in front and a 180 in back.
    Was 203 front and back, but I had a bit too much on the rear, so dropped it down to 180. That gives a nice balance.
    Any runs I am going to do / have access to are less than 10 minutes, with most half of that, so ultimate heat dissipation over an extended time is not a worry.

    Brakes are:
    Avid Trail X0 with stock 200/180 rotors
    Magura Louise BAT with 203/180 Venti-rotors

    michael
    A Dirtbag since 1969.
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  11. #11
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    Quote Originally Posted by JefedelosJefes View Post
    200. Why would you not want more braking power? The only bennefit to 185 is to save like 20 grams... who cares, it's a DH bike.
    I agree with this, I am not racing high level national or world level, 20 grams isnt going to make the kind of difference for me, or anyone really IMO, except I like to know I have brakes ANT TIME I want them. For me it is about reliability... I know I pretty much cant make them fade.
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