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Thread: Shimano 525 disc brakes - make em quiet and powerful

  1. #1
    MoJo PoLaR BeAr
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    Shimano 525 disc brakes - make em quiet and powerful

    In June '02 I got a new ride - a Specialized Enduro FSR with these disc brakes. All was wonderful, until the first time the brakes got wet and I found how loud a squal can be. Power didn't seem to fade much if at all, but the noise was irritating.

    Did a 24-hr race in Nov and the noise was horrid because of the constant wet from mud and stuff.

    This noise got even worse when I finally had to change brake pads and went with the EBC Gold sintered-metal pads instead of the standard resin pads.

    I go real intense trying to figure out a fix.

    Which turned out to be easy.

    I initially changed out the rear rotor for an avid 160mm to try to get ride of the noise-when-wet characteristic of the Deore stainless steel dinner plates - and that worked wonderfully. Power and modulation was as good if not better than with the factor rotor, however there was no longer any noise when wet.

    Logical progression made me want the same improvement on the front, and I had been thinking for a long time that even more power would be good - particularly when I go to Moab this spring. Some extended conversions with many people and in particularly with Charles from Hammerhead Bikes later, and some trial fitting, and viola.

    Replacing the front rotor with the Avid 185mm and the caliper mount with the Avid 185 adapter mount was a bolt-on no-tweak replacement. Schweet.

    The Avid adverts say that the 185 rotor will yield 15% more power than the 160mm. Since their rotors clear and are better ventilated than the Shim 525 stock rotors I believe I'm expecting even better improvements.

    Will try to post a follow-up in a while after this setup has been in use longer ( I've had the rear rotor on since Christmas ).

    <p>

    Front Shim 525 w/Avid 185 rotor on Chris King hub and Marzocci MX Comp fork:
    <img src="http://gallery.consumerreview.com/webcrossing/images/Shim525cAvid185r.jpg">

    <p>

    Rear Shim 525 w/Avid 160 rotor on Chris King hub, '02 Enduro FSR frame:
    <img src="http://gallery.consumerreview.com/webcrossing/images/Shim525cAvid160r.jpg">

  2. #2
    mOjO cHaUfuRr toonces's Avatar
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    Sweet.

  3. #3
    MoJo PoLaR BeAr
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    Supplemental data: rode City Park today, the front brake RULEZ.



    Okay, okay, pipe down. I'm sure the top end Hayes is better, and some of the offshore stuff is good. But we're talking about a brake that is spec'd on a LOT of bikes these days 'cause it is CHEAP ( <100 bones stock, full hydro brakes ). Even after adding the money I spent on these rotors they're still cheap, and they're working fantastically.



    If there's any more significant info I'll post, but I kinda feel like this is going to be the result.

  4. #4
    mOjO cHaUfuRr toonces's Avatar
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    I wish I could get some thicker rotors for my hayes hydros, but the clearance between pads is slim enough as it is.

  5. #5
    Got Mojo? Cosa Nostra's Avatar
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    Toonces, do you have issues with having to align the calipers on your hayes hydros at all? I've had to realign my 3 or 4 times now.

    Bear, when are you heading to Moab in the spring? Myself and a co-worker are trying to figure out a date for our annual spring trip and was thinking about inviting any MoJo's that wanted to go.
    Where's the Mojo?

  6. #6
    mOjO cHaUfuRr toonces's Avatar
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    Originally posted by Cosa Nostra
    Toonces, do you have issues with having to align the calipers on your hayes hydros at all? I've had to realign my 3 or 4 times now.

    Bear, when are you heading to Moab in the spring? Myself and a co-worker are trying to figure out a date for our annual spring trip and was thinking about inviting any MoJo's that wanted to go.
    Yes. That's how Hayes are. Any slight misalginment of anything such as wheel, rotor, hub, or piston will cause rubbing. Best thing to do is make sure 100% that the wheel is square in the dropouts before aligning the brake body. Then, if it rubs on the trail, make sure the wheel is still aligned. But I also have had issues with bent rotors. That can be fixed with an adjustable cresent wrench and a good eye. I wish there was some breathing room and more adjustability. But the brakes rock.

    --

    About this Moab thing... I was thinking about a trip up there too this spring. When do ya'll plan on going?

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