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  1. #1
    Medicinal Cyclist Daytrip's Avatar
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    Shimano 105 Brake Installation Problem

    I decided to upgrade my Giant OCR-1 to all Shimano 105 components, which on the 2008 model includes the BB, crank and brakes. And I also put on an 11-23 cassette to replace the stock 12-25.

    Anyway, I thought the brakes would be the easy part, but they turned out to be a real pain, and I'm scratching my head over the current pad placement. As you can see in the photos, both sets of pads are as low in the slots as they can go, and they're still barely (or maybe not even barely) missing the tires when the brakes are engaged.

    This really isn't addressed in the documentation that I can find. Obviously something ain't right. I rode it around the block and I don't think the brakes are hitting any rubber now, but it's pretty darn close.

    Other than that, everything went very well. I was surprised to find that after just 2,000 miles, the BB shell had a bunch of grit and other crap accumulated in it. I assume it got in through a weep hole somewhere, but is that normal?
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    Let your freak flag fly.

  2. #2
    Senior Member
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    Your OCR problem came with long reach brake calipers originally. Shimano makes a few different sets which will allow you plenty of adjustment. Alternatively since you are so close, you could slightly extend the slot in your current calipers using a file to get the pads to clear the tires. If it were my bike, I'd buy the right calipers for the job though.

  3. #3
    Senior Member
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    If it were my bike, I'd do the same thing I've done on my other bike when installing a 105 brakeset on it. That is, as joejack951 suggested, extend the reach of the brakes by filing off some material and making the brake slots extend further downwards.

    To do this, all you need is a round file, some cutting fluid (any bike oil will do just fine), and patience. After a few thousand kilometers I've experienced no problem at all with my modified, extended reach 105 brakes.

    Keeping the area you're filing off well cleaned and lubricated makes the filing process go more smoothly.

  4. #4
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    Quote Originally Posted by Daytrip View Post
    Other than that, everything went very well. I was surprised to find that after just 2,000 miles, the BB shell had a bunch of grit and other crap accumulated in it. I assume it got in through a weep hole somewhere, but is that normal?
    Yes, it is magic dirt. It doesn't matter what measures you take to keep dirt out of your BB, it will always end up in there.

    PS: I agree on the brakes. File a mm out of the bottom of the slot. Not going to hurt a thing. (And according to some in the Road Cycling forum, it will make you faster since your bike will be lighter.)

  5. #5
    Medicinal Cyclist Daytrip's Avatar
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    Thanks. My other obsession is cutting firewood, so I have a nice selection of round files and 'cutting fluid.' It's so close to being right, I don't think I'll have to remove much at all. Nice and tight, you know, not a bad thing all around. I'll add the annual BB cleanout to my maintenance routine. I think the dirt gets in through the keyhole in the seat tube on rainy rides. Grit gets everywhere else, so why not in the BB?
    Let your freak flag fly.

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