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Tektro dorado disc size

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    Tektro dorado disc size

    I definitely want to use the dorado ebrakes on my up coming build. The question is that my front fork specs say max disc size is 185mm. This is not a clearance issue but supposed strength issue. Do I really need to be concerned or should I just go 180mm front and rear. This will be a bbshd build and I weigh 175 lbs. Bike should weigh 45 to 50 lbs all up.
    Thanks!

    #2
    I have Tektro Dorado hydraulic brakes with 203mm rotors on all four of my bikes, and they have served me very well, converting countless would be accidents into close calls.

    If I were you, I would absolutely follow the manufacturer's recommendation and warning. If you run a larger rotor, you risk a catastrophic mechanical failure which could injure or kill you or somebody else.

    If you must run the 203mm rotors, get a stronger fork and sell your old fork on eBay.

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    • funwithbikes
      funwithbikes commented
      Editing a comment
      Excellent point,

      We think about torque arms and drive train load on our ebike builds. But seldom consider the mechanical load on the brake system. The extra speed and weight of an ebike put an impressive amount of torques on the front forks during a stop. Especially those long heavy cargo bikes that are out and about in traffic.

    #3
    I have a Cycle Analyst so I can read the values for the amount of regenerative braking in Watts.

    It is usually over 1000W and I have seen it as high as 2800W, so this is definitely torque arm territory.

    The braking force from my Tektro Dorado hydraulic brakes with 203mm rotors is definitely more than any regen I have experienced.

    I imagine a hard braking scenario that takes a fork beyond its limits could spin or crack the dropouts on the fork or damage the brake mounts on the fork. In either case, you would lose your front brakes under hard braking. Not the kind of excitement that we are looking for.
    Last edited by commuter ebikes; 04-18-2017, 12:24 PM.

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      #4
      Argh! Looks like the dorado e710 is impossible to find now without paying a huge premium. The Tektro e725 looks to be it's replacement and is 4 piston calipers but who is going to sell them ??
      I am ordering my bike from bikes direct next week. I may go with the more expensive model that has Tektro Draco hydraulics with 180mm rotors front and rear. The bike I wanted was cheap mechanicals to be replaced with Dorado's. Will the Draco be enough and I will cob the cutoffs onto them or will someone get the e725's in lol. Trouble with the build already lol!!

      Comment


        #5
        Originally posted by Scott S View Post
        Argh! Looks like the dorado e710 is impossible to find now without paying a huge premium. The Tektro e725 looks to be it's replacement and is 4 piston calipers but who is going to sell them ??
        I am ordering my bike from bikes direct next week. I may go with the more expensive model that has Tektro Draco hydraulics with 180mm rotors front and rear. The bike I wanted was cheap mechanicals to be replaced with Dorado's. Will the Draco be enough and I will cob the cutoffs onto them or will someone get the e725's in lol. Trouble with the build already lol!!
        Here are some: https://www.empoweredcycles.com/collections/performance-e-brake. As you know, these have the wiring for an e-brake. It looks like he is currently out of stock of the front brakes, but you could order one and wait. I have bought eight of these exact brakes from Matt Hughes and had him build me six wheels. He is top notch.

        This place has front ones in stock with a 203mm rotor: http://propelbikes.com/product/tektr...brake-hd-e710/.

        I see what you mean about paying a premium as Amazon only has four front ones left: https://www.amazon.com/Tektro-Dorado.../dp/B0168E7WZC, and that price doesn't even include a rotor.

        If I were in your shoes, I would cough up the cash and get the E710s. That is still more economical than the Magura MT4e.

        Are you going to use 180 or 203mm rotors?

        Here's the manual, by the way: https://drive.google.com/file/d/0Bwl...dZcE1GV1U/view. The torque spec on the rotor bolts is a mere 4-6 Nm.
        Last edited by commuter ebikes; 04-21-2017, 04:28 AM.

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          #6
          I am going to have to use 180mm rotors to be in the"safe" zone of the front fork specs.
          This is the bike I want to get. It has mechanical brakes that will get swapped with good ebrakes. It is not a full blown MTB hard tail but 99 percent of my riding will be on the road. Just an 8 speed but I understand I don't need a zillion gears with the bbshd.
          What do you all think of this bike as a bbshd platform. I would get the red color lol.

          http://bikeshopwarehouse.com/cgi-bin...ils&ProdID=732

          This would be my other choice with hydraulic 180mm rotors. Fitting the brake cutoffs for now. Not tubeless compatible as the bike above but OK with me. In the burnt orange color!

          http://www.bikesdirect.com/products/...antom29_x4.htm
          Last edited by Scott S; 04-21-2017, 12:31 PM.

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            #7
            Great news. I just received an email from Matt at empowered. He has more e710's coming around the 25th this month. He said he is also going to order the new e725's when they become available. So everything is looking good now.
            Now what bike to order lol.

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