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Thread: ST-RX810 Shimano GRX (Mechanical) Brake Lever Optimization

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    Default ST-RX810 Shimano GRX (Mechanical) Brake Lever Optimization

    I'm brand spankin' new to these ST-RX810 hydraulic mechanical levers. Loving the shape and shifting. I've adjusted the reach to it's furthest (to the sun) and am still looking for some adjustment. When closed, both levers will contact the bars. Admittedly, I'm probably on the deck at that point but it bugs me that I have to close them this far.

    Questions. What is an acceptable reach (page 60: https://si.shimano.com/pdfs/dm/DM-GADBR01-01-ENG.pdf ) and with the adjustment at it's max (open/clockwise) is there more I can get out of it?

    Questions. Adjusting freestroke is a bit more nebulous (page 61: https://si.shimano.com/pdfs/dm/DM-GADBR01-01-ENG.pdf ) Clockwise adjustment should narrow the lever travel however the adjustment screw is already closed as far is it can go (clockwise). Is the answer to back it out and squeeze the levers hard a few times to allow the pistons to self-adjust?

    Gentle responses welcome ;)

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    Default Re: ST-RX810 Shimano GRX (Mechanical) Brake Lever Optimization

    Are you sure you don't have any air in the hydro lines? If they are bled the amount of lever pull should stop before the bars. Although these do pull in tighter than the 785s (or whatever the first Shimano road hydros were numbered).
     

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    Default Re: ST-RX810 Shimano GRX (Mechanical) Brake Lever Optimization

    Quote Originally Posted by SpeedyChix View Post
    Are you sure you don't have any air in the hydro lines? If they are bled the amount of lever pull should stop before the bars. Although these do pull in tighter than the 785s (or whatever the first Shimano road hydros were numbered).
    Fixed. Thanks for ax'in. What I did was to cycle the freestroke adjustment and they tightened up alot. Go figure? Prior to this I did a very scrupulous bleed as in medieval alchemist bleed and was able to pull/push several bubbles.

    Either I just needed to cycle the levers or the freestroke adjustment and all is well. It's still mystery science theater.

    This is really no different than any car I've worked on. The principles are the same.

    Anywho, I'm very VERY pleased with the bike and the brakes now. Did I mention @44bikes knocked this one out of the park. I'm a little sad mine is so much better than everyone elses ;)

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    Default Re: ST-RX810 Shimano GRX (Mechanical) Brake Lever Optimization

    make sure you cycle reach/freestroke when doing your bleed

    also note that the servowave mechanism in the 810 levers means they will continue to pull a bit past the contact point, but the power is better than almost anything else
     

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    Default Re: ST-RX810 Shimano GRX (Mechanical) Brake Lever Optimization

    Quote Originally Posted by andrew flowers View Post
    make sure you cycle reach/freestroke when doing your bleed

    also note that the servowave mechanism in the 810 levers means they will continue to pull a bit past the contact point, but the power is better than almost anything else
    Ahh ha! Thanks Andrew. They are real REAL good stoppers.

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    Default Re: ST-RX810 Shimano GRX (Mechanical) Brake Lever Optimization

    Quote Originally Posted by Too Tall View Post
    Ahh ha! Thanks Andrew. They are real REAL good stoppers.
    I guess final comment would be after a ride or two put the bleed cup back on and do your burp procedure again. Often this is needed to get the final few bubbles out
     

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    Default Re: ST-RX810 Shimano GRX (Mechanical) Brake Lever Optimization

    Quote Originally Posted by andrew flowers View Post
    I guess final comment would be after a ride or two put the bleed cup back on and do your burp procedure again. Often this is needed to get the final few bubbles out
    Noted.
    I think we have achieve lift off. This is probably as good as it gets. I'm happy >>
    brake.jpg

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