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Thread: atc 70 bolt on rear disk brake?

  1. #1
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    atc 70 bolt on rear disk brake?

    does anyone know of one being offered now? or would ther be any interest if there was a kit available? I looked and all I could find were modified drums and some way too much fab work for a bolt on type of guy. Thanks in advance for any input.

  2. #2
    remsandpets's Avatar
    remsandpets is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    That would be a nice addition. I would consider that a good mod if it were affordable that is.
    Russ J in SW PA
    83 Honda 200 (fishing and hunting "rig")
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  3. #3
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    Quote Originally Posted by remsandpets View Post
    That would be a nice addition. I would consider that a good mod if it were affordable that is.
    Agreed. Would be nice to have, price would be key.

  4. #4
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    hmmmmmm i have an idea hehehehehe le tme do soem research on this.
    ok here goes, 85 atc70,2 84 atc70's 83 alt50,83 atc110 , 70 us 90 parot green, 85/86 350x garage queen, stock rider 85 350x, project 85 350x 85 250r drag bike, 2 85 250sx's, alt185, , scat tracker?99blaster,85 250r rider,85 250r ice racer project ,93 kx500,99 xr200r, 91 dr250s ,89 lt500 quadzilla,88 lt250quadracer, 88 trx250r race full on race quad,, 01 yamahakodiak400, kawaki kd100,lt50 for my doughters,93 300ex, 230 quadsport, lt185, lt250 quadrunner,84200s, is that enough?

  5. #5
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    Quote Originally Posted by remsandpets View Post
    That would be a nice addition. I would consider that a good mod if it were affordable that is.
    what is affordable to you? Understand it will be a few off the shelf parts and some custom parts. @brapp no need to find the parts and design a bolt on caliper mount, I already did.

  6. #6
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    Is there much need for it? The stock shoes fit bigger 3-wheelers and some motorcycles so its kind of overkill for a 70. With a nice drum and new shoes Mine will lock up the rear wheels with ease on hard packed dirt with me on it (210lbs). I'd say it might even lock the tires up on the road but I've never tried it. I'm not saying a rear disc wouldn't be nice, just not something I personally would spend money on.
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  7. #7
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    Quote Originally Posted by just ben View Post
    what is affordable to you? Understand it will be a few off the shelf parts and some custom parts. @brapp no need to find the parts and design a bolt on caliper mount, I already did.

    sounds cool Ben, lets see it.

  8. #8
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    Quote Originally Posted by Blown 331 View Post
    Is there much need for it? The stock shoes fit bigger 3-wheelers and some motorcycles so its kind of overkill for a 70. With a nice drum and new shoes Mine will lock up the rear wheels with ease on hard packed dirt with me on it (210lbs). I'd say it might even lock the tires up on the road but I've never tried it. I'm not saying a rear disc wouldn't be nice, just not something I personally would spend money on.
    do I really need to explain the advantages? Less fade,better wet performance,no adjusting. longer pad life. You said the key words "with a nice drum and new shoes" These machines are 27+ years old and finding a brake drum that is actually not past its recomended wear can be difficult. If someone has an all original 70 this obviously wouldn't be for them but it seems alot of the 70's have been modified with bigger engines ect. and a modern brake system may be benificial to these modded machines.

  9. #9
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    Isn't there a company that already sells a disc set up for a 70???

  10. #10
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    Quote Originally Posted by big specht View Post
    Isn't there a company that already sells a disc set up for a 70???
    I have seen one for the front but it is not bolt on at all and having first hand experiance with it I wouldn't recommend it. That kit is just a couple pieces of steel tubing with a bicycle rotor. The rear kit I have in mind is all atv parts that are modified and a custom bolt on caliper mount

  11. #11
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    well i found a rotor hub, that works with the stock axle, i located a source for a mechanical caliper for a foot brake , and now just need to find a rotor that works witht he hub as the one that works with the hub it 8 inches and a little bigger than i would liek on a 70, and also lookign up ideas for a front brake system also.
    ok here goes, 85 atc70,2 84 atc70's 83 alt50,83 atc110 , 70 us 90 parot green, 85/86 350x garage queen, stock rider 85 350x, project 85 350x 85 250r drag bike, 2 85 250sx's, alt185, , scat tracker?99blaster,85 250r rider,85 250r ice racer project ,93 kx500,99 xr200r, 91 dr250s ,89 lt500 quadzilla,88 lt250quadracer, 88 trx250r race full on race quad,, 01 yamahakodiak400, kawaki kd100,lt50 for my doughters,93 300ex, 230 quadsport, lt185, lt250 quadrunner,84200s, is that enough?

  12. #12
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    Quote Originally Posted by just ben View Post
    I have seen one for the front but it is not bolt on at all and having first hand experiance with it I wouldn't recommend it. That kit is just a couple pieces of steel tubing with a bicycle rotor. The rear kit I have in mind is all atv parts that are modified and a custom bolt on caliper mount

    dude, you gotta quit holding out on us! lets see it,, im just pulled my 70 stuff out last night to start rebuilding it. i could be the first tester.

  13. #13
    tblumer's Avatar
    tblumer is offline At The Back Of The Pack Arm chair racerFirst time rider
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    200x disc might fit, i know it fits the splines on a 90
    84 ATC 70 w/88 (for the kids)
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    My feedback:
    http://www.3wheelerworld.com/showthr...89#post1080789

  14. #14
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    Quote Originally Posted by trizilla View Post
    dude, you gotta quit holding out on us! lets see it,, im just pulled my 70 stuff out last night to start rebuilding it. i could be the first tester.
    Your the only one who wants to see it lol. sorry I already have someone in mind to test it...me haha. The one in this picture is a bolt on but I had to drill two holes in the frame, The design I have in mind will be completly bolt on no drilling,welding,ect. There just doesnt seem to be enough interest to justify my time and money to put several together right now. I may put a kit together and throw it up on ebay to see what kind of interest there is out there.Click image for larger version. 

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  15. #15
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    Quote Originally Posted by just ben View Post
    Your the only one who wants to see it lol. sorry I already have someone in mind to test it...me haha. The one in this picture is a bolt on but I had to drill two holes in the frame, The design I have in mind will be completly bolt on no drilling,welding,ect. There just doesnt seem to be enough interest to justify my time and money to put several together right now. I may put a kit together and throw it up on ebay to see what kind of interest there is out there.Click image for larger version. 

Name:	70 brake 002.jpg 
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    are you using a hand brake? i have been hording a working caliper, line, and master from a chinese quad but it will be hand operated. not a big deal to me but might be to some. how is your caliper mounted? caliper mount to frame? i cant tell from the pics. have you talked to jsmay? he's putting a couple 70's together and may be interested also.


    since you'll be testing this one can we expect to see you with this at the next race? maybe a 70 showdown?lol

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