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Best Heavy Duty Rotors? (e-bike related)

Discussion in 'Downhill & Freeride' started by gemini2k, Dec 30, 2018.

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  1. gemini2k

    gemini2k Turbo Monkey

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    What the verdict on the best heavy duty rotors these days? I don't really care about weight, since this would be going on my e-bike. As it turns out, constantly pinning it up and down SF hills and stopping from 25+ mph on flats while me being 200+ pounds on a 50+ pound bike is overwhelming the stock 7inch rotors a bit more than I'd like. The fork/bike (Specialized Vado) are only rated for 7inch, so I'm hesitant to throw 8inch rotors on there. I figure if I can find something thicker/more solid that might help with cooling and warping.

    Thoughts?
     

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  2. commencaldh

    commencaldh Jeremy Hottinger

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    my hope rotors seem to be doing well with the abuse i put them through, but maybe mod the e-bike with some moto rotors and brakes.
     
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  3. buckoW

    buckoW Turbo Monkey

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    My understanding is that the new thicker rotors designed for Ebikes need a wider caliper to go with them. TRP makes an ebike caliper and thicker rotor, btw.
    I have Hope rotors on mine and they hold up well. We put 225mm Hope rotors on my 68yr old Mom’s eMTB with great success. (I no longer hear complaints about brakes every other day.).
     
  4. HardtailHack

    HardtailHack used an iron once

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    Phwoar, a road E-Bike post in the DH section, awesome!

    Hope only make a ventilated 8" rotor and you need their Tech V2,3,4,5 calipers, maybe the newer ones work in the wet but my old ones didn't.
    Things have no doubt changed, even Magura make brakes that work now.
     
    #4 -   Dec 30, 2018
    Last edited: Dec 30, 2018
  5. rideit

    rideit Bob the Builder

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    My HS- 33’s were fucking AWESOME
     
  6. Flo33

    Flo33 Turbo Monkey

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    Trickstuff Dächle HD (=Heavy Duty) are very solid.
     
  7. gemini2k

    gemini2k Turbo Monkey

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    But I'm pinning it super hard down SF hills?
     
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  8. vinny4130

    vinny4130 Monkey

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    Magura, Hayes, Trp make a thick rotor.
     
  9. Toshi

    Toshi Harbinger of Doom

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    I've got 4-piston XTs with Ice Tech rotors on my Pivot Shuttle and they hold up fine.
     
  10. iRider

    iRider Turbo Monkey

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    No fixie, no care.
     
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  11. Jm_

    Jm_ Turbo Monkey

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  12. Kurt_80

    Kurt_80 Monkey

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    Are they the experimental Shimano dual discs from the early 2000s? The ones where pros were soaking them in oil prior to race runs as they were too powerful?
     
  13. Jm_

    Jm_ Turbo Monkey

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    Yep. I have to wonder how those would fare today...
     
  14. HardtailHack

    HardtailHack used an iron once

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    Guessing they are Hopes, look near identical to my Motos from 2009, I still have a ventilated rotor in the garage. Still have multiple types/brands of pads too, tried any type I could find to hopefully make them work in the wet. Everybody commented on how awesome they looked and I guess that was a pretty big part of DH, the banter at the top of the hill.
     
  15. Jm_

    Jm_ Turbo Monkey

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    They are not hopes. Shimano used a dual-rotor design that had 3 pads, one sandwiched in between two of the rotors. The had water-cooling and a radiator to boot. Hope ventilated rotors were a different thing.
     
  16. HardtailHack

    HardtailHack used an iron once

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    Well I apologize, I was wrong, had no idea that Shimano thing existed, a bike with those brakes and Airlines would be pretty sweet. It does look very British, just add bits until it starts working.

    So both the outer rotors floated? I don't see how the centre pad would be of any use otherwise, unless it relied on the discs flexing......?
    Crazy voodoo.Brakes seem like one of the simplest parts on a bike but they have taken many years to get performing at a level that everyone except the regulars in the Frankenbrake thread are happy with..
     
  17. mykel

    mykel Turbo Monkey

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  18. Sandwich

    Sandwich Pig my fish!
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    Maguras are usually thicker than others. If you're having trouble with overheating, I'd go for a two piece rotor like a hope, or grab a shimano icetech setup. That should help more than 0.1mm.
     
  19. Jm_

    Jm_ Turbo Monkey

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    I definitely noticed a big improvement moving to the icetech rotors on my two summer bikes. On the RFX, got me out of glazing the pads and holding on for dear life on the 45° grades, on the XC bike with only 6" rotors they never overheated during multi-thousand foot descents, power was never huge at 6", but it was adequate for XC race and the fact that I could use them so heavily and not overheat was impressive. The downside is like any rotor they will wear and at some point you should replace em (measure the thickness). It's a steel-aluminum sandwich so you don't want to get let it go too far, but I don't now of anyone that has.
     
  20. mykel

    mykel Turbo Monkey

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    I have a couple of sets of old Magura Venti rotors from the Louise BAT days.


    (not mine, pic from teh 'netz)

    I fucking love them. They get / got ported all over the place.
    All of them are pretty much at their limit at about 1.75 according to Magura.
    Thing is, now they are the size of some new rotors....
    Currently being used with Hope Tech3V4 and Avid XO Trails.

    They still stop my fat ass, they run true and don't gobble...

    Are they really done??
     
    #20 -   Dec 31, 2018
    Last edited: Dec 31, 2018
  21. slimshady

    slimshady ¡Mira, una ardilla!

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    I summon @jackalope to this thread, and also someone with the necessary powers, to change the thread title for what it really is: a massive outing campaign for closet e-bike riders.
     
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  22. 'size

    'size Turbo Monkey

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    my OG galfer rotors are thicker than any other brand i've used before or since. not sure if they're still that way.
     
  23. jackalope

    jackalope Mental acuity - 1%

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    in a single wide, cooking meth...

    For real. Maybe the admin lizards need to create a (fucking) e-bike forum, so we can keep this one focused on proper gravity mountain bike topics like - how to acquire potent asthma medications, ocean fill crab0n bikes/fancy forks, component warranties and T-shirt designs.
     
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  24. buckoW

    buckoW Turbo Monkey

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    This thread is mildly relevant to DH because last year Gwin rode the thicker disc’d ebike brakes from TRP.
     
  25. Udi

    Udi RM Chief Ornithologist: “I Brake for Birds”

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    Plenty of good suggestions here but I wouldn't use ice tech on an e-bike.
    They do have a significantly shorter wear life than regular rotors even under non-electric chairlift usage, and heavy guy + e-bike + ice tech is a recipe for disaster if you don't closely monitor wear. I do think they're good rotors (lightweight, great heat dissipation) but just not the right one for this particular case.

    I would just spring for 8" rotors (at least) though, if the frame/fork can't handle that then you really shouldn't be on it anyway. If you think about it, a brake with very high peak force on a 7" rotor could easily put more force through the frame/fork anyway, and going up a rotor size will work wonders for heat dissipation - because the extra leverage (thus extra peak force at contact patch) will mean you'll likely drag them less too, in addition to the larger dissipation area. If the bike spontaneously combusts from the bigger rotors then it probably would have happened eventually anyway, just put the 7" back on when you get it warrantied and say the other burns were from an unrelated house fire.
     
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  26. Udi

    Udi RM Chief Ornithologist: “I Brake for Birds”

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    I was trying to figure out why on earth you bought it, but leisure cycling while looking stylish are all the important things.
     
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  27. johnbryanpeters

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    @Udi, Why do Ice Tech have a shorter wear life?
     
  28. Jm_

    Jm_ Turbo Monkey

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    They aren't solid steel, the core of the braking track is aluminum, so there are relatively thin steel braking tracks on either side which are in contact with the rotor.
     
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  29. toodles

    toodles Turbo Monkey

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    Rotors.jpg

    Yes I'm aware I'm a brake dragging squid. No need to point that out.

    As @Jm_ pointed out - the steel braking surface eventually gets etched through and aluminium provides fuck all braking. This is usually identifiable by a combination of sudden howling from the brakes and sudden screaming from the rider.
     
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  30. Flo33

    Flo33 Turbo Monkey

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    One could point at the 7 o'clock section of the lower rotor. :nerd::busted:
     
  31. Westy

    Westy the teste

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    You can get some nice heavy duty rotors from your local Harley Davidson dealer.

     
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  32. Jm_

    Jm_ Turbo Monkey

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    This one, because E bikes.









    Interestingly, Hope made an "aggressive" saw-blade one many years ago, but they appear to have wiped the internets of it's existence (no, not the current ones with the rounded edges).
     
  33. chris_f

    chris_f Monkey

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    Didn't the old Hope sawblade discs have a tendency to crack and fail?
     
  34. johnbryanpeters

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    Eee bikes?
     
  35. Jm_

    Jm_ Turbo Monkey

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    Meebee, I thought they also took them off the market because they were actually pretty damn dangerous just because of the saw. It's strange that all pictures and evidence seems to be gone though...
     
  36. mykel

    mykel Turbo Monkey

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    I remember them, but also could not find a pic.

    Seems a bit lizzardy :tinfoil:
     
  37. chris_f

    chris_f Monkey

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    Huh, strange... This lizard looks like a sawblade.

    I've said too much...

     
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  38. Udi

    Udi RM Chief Ornithologist: “I Brake for Birds”

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    Balfa = OG lizards?
     
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  39. gemini2k

    gemini2k Turbo Monkey

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    Good to know. I'll probably swap out the front at least to something else.

    That's kinda my thinking. I have a hard time believe that an overheated 7" rotor is safer than a slightly cooler 8 inch rotor.

    Original idea was I wanted to use this for my 40 mile commute to work (ride from SF to Santa Clara, take mass transit from Santa Clara to SF, 2-4 days/week ). On my CX/road bike I can average about 17 mph (with stoplights and such). With the e-bike I can basically hold 28 mph (and with a rack and panniers!), which makes my average moving speed like 25. So it becomes fast enough to do regularly instead of 1 day per week.

    But also I've found that the e-bike is f-ing amazing for getting around SF. It's cutting my Uber/Lyft bill in half.

    I figure as a tech worker in SF, if I'm not going to buy a Tesla, I at least need to own an e-bike.
     
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  40. gemini2k

    gemini2k Turbo Monkey

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    Unrelated: I did got to an erotically/homosexually themed puppet-based musical last night. I didn't ride my e-bike there though because my foot is all swollen from a stupid rock/moto incident.