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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  ***ACS rotor twin cable mod***
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Author Topic: ***ACS rotor twin cable mod***  (Read 3589 times)

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Offline oldschoolace

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***ACS rotor twin cable mod***
« on: September 18, 2013, 02:45 PM »
As some of you will know i have been playing with the idea of running twin cables on my next build. I had discussed a few options with Terry and as i dont like the messy look of a gyro a modified rotor seemed the obvious choice  :)

As far as i know earlier ACS rotors have a circlip holding them together while the later ones, which are more common on the bay have a lock nut and split pin. The mod works with either but these pics show the lock nut model.

First using a small panel pin/nail tap out the split pin FROM THE INSIDE OUT. It is slightly tapered and much easier to get out this way.




Once removed hold the lower half of the rotor tightly (a vice is best) and undo the lock nut. It can take some effort to undo as the hole for the split pin can leave a burr on the thread.




Lift out the steel washer, stepped nylon washer and the bottom half of the rotor.




Remove the cable (it will probably have a little nylon ball grommet at the pear end) and mark the other side of the ring for drilling. It should be central on the rings width.




You can replace the stepped nylon washer and flick out the little black acs plug from the top section then put the two together to check your mark is exactly opposite the existing hole.



Drill a 4-4.5mm hole right through then flip it over and countersink the hole with a 6-7mm hole. Make sure the countersinks are on the same ring face. You only need to drill deep enough for the brake cable pear to sit just below the surface.






Next mark and drill a 5mm hole into the side of the top section where the plastic ASC lug was removed from. Tap for an M6 thread and turn in a mild steel bolt until it stops. Carefull file a flat spot on the thread as close to the rotor as you can and drill a hole large enough for a cable to run through. Cut to length for a washer and nylon lock nut.




Rebuild your rotor remembering to insert the cables and it should look something like this.










The only tricky bit is drilling a cable hole through the M6 bolt. A pillar drill is needed really although i'm sure trapping the cable between two washers under a ntt would work just as well.  :daumenhoch:

Will get some pics up of the instalation method tonight  :)



Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline pickle

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Re: ***ACS rotor twin cable mod***
« Reply #1 on: September 18, 2013, 02:50 PM »
how are you going to stop the upper cables?  i always thought the ACS rotor works well as it is with the single cable. 

i admire your work there but that's going to be fiddly as fook to set up.

best of luck and show us piccies once it's done  :daumenhoch:

Offline oldschoolace

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Re: ***ACS rotor twin cable mod***
« Reply #2 on: September 18, 2013, 02:57 PM »
I have always thought that main problem with Acs rotors is that the single cable wants to pull the rotor out of square so it binds on the stem post. Twin cables should keep it square. I'm running mine with a compatable stem and using the non compatable stem plate to run the other cable  :)

You could in theory use two of these if you didn't have the right stem
« Last Edit: September 18, 2013, 02:59 PM by oldschoolace »
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline Gnarlyscoots

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Re: ***ACS rotor twin cable mod***
« Reply #3 on: September 18, 2013, 03:10 PM »
Looks good that Clint. Can't you just use 2 x stem bolt tabs for the upper cables? Keeps it looking old school too  :daumenhoch:
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Offline oldschoolace

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Re: ***ACS rotor twin cable mod***
« Reply #4 on: September 18, 2013, 03:25 PM »
Thats the plan Terry. Stem bolt tabs sounds better than a non compatable stem plate  :LolLolLolLol:

Going to run my ACS stem or a tioga rs-2 stem like this with a tab for the second cable  :)

Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline Gnarlyscoots

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Re: ***ACS rotor twin cable mod***
« Reply #5 on: September 18, 2013, 05:18 PM »
Is it a 45 or 55 stem mate  ???

I would definately go with the ACS stem and 2 x stem bolt tabs  :daumenhoch:
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Offline oldschoolace

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Re: ***ACS rotor twin cable mod***
« Reply #6 on: September 18, 2013, 05:25 PM »
Not sure on the RS-2 havn't measured it. Yeah the beauty with twin bolt tabs is that i can set it up directly above the lower cable mounts creating a cleaner look. Will have a butchers tonight  :daumenhoch:
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline Discostu

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Re: ***ACS rotor twin cable mod***
« Reply #7 on: September 18, 2013, 07:39 PM »
Excellent thread, I love a bit of modding.  :daumenhoch:

Offline garran

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Re: ***ACS rotor twin cable mod***
« Reply #8 on: September 18, 2013, 08:08 PM »
always a good read, nice one

Offline bigfatolly

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Re: ***ACS rotor twin cable mod***
« Reply #9 on: September 18, 2013, 08:51 PM »
Looks good that,will be interested to see how it looks on the bike and if it works.
This is the sort of thing the Freestyle boys would have done back in the day......

Offline oldschoolace

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Re: ***ACS rotor twin cable mod***
« Reply #10 on: September 18, 2013, 09:43 PM »
Well happy  :)

Just tried a dry run and its going to work like a dream  :daumenhoch:
Still on the look out for a spin tech twin cable headset cup but if need be i will use a 1 inch gyro mount until one turns up.

Cant wait to get my build finished now and try this thing out with a postmans skid  ;)
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline Gnarlyscoots

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Re: ***ACS rotor twin cable mod***
« Reply #11 on: September 18, 2013, 09:55 PM »
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Offline oldschoolace

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Re: ***ACS rotor twin cable mod***
« Reply #12 on: September 18, 2013, 10:05 PM »
Yep great minds and all that, Mid school gash that though  :LolLolLolLol:
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline Gnarlyscoots

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Re: ***ACS rotor twin cable mod***
« Reply #13 on: September 18, 2013, 10:11 PM »
Yep great minds and all that, Mid school gash that though  :LolLolLolLol:
:LolLolLolLol:

Some mid school is nice though  :daumenhoch: 

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Offline oldschoolace

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Re: ***ACS rotor twin cable mod***
« Reply #14 on: September 18, 2013, 10:14 PM »
Certainly is  :daumenhoch: but a mid 90's rotor on an 87 build.... Even i'm not that daft  :LolLolLolLol:
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline Gnarlyscoots

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Re: ***ACS rotor twin cable mod***
« Reply #15 on: September 18, 2013, 10:28 PM »
but mid 90's on an 87 build.... Even i'm not that daft
:(


You could buy an ACS decal buddy  :whistle:   ;D
« Last Edit: September 18, 2013, 10:30 PM by Londonhellboy »
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Offline oldschoolace

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Re: ***ACS rotor twin cable mod***
« Reply #16 on: September 18, 2013, 10:44 PM »
God i'm thick sometimes!, you know i wasn't having a pop at your modern twist trickstar dont you Terry?  :-[

You know that sort of stuff is up my street, just trying to keep my Starway looking 80s....
Although it will be sporting white ACS true frequency G's  :LolLolLolLol:
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline Dannywhac

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Re: ***ACS rotor twin cable mod***
« Reply #17 on: September 18, 2013, 10:50 PM »
Ace that Clint - looking forward to seeing it implemented, and Terrys project n'all  :daumenhoch:
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griff

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Re: ***ACS rotor twin cable mod***
« Reply #18 on: September 18, 2013, 11:11 PM »
You just can't stop meddling with stuff can you Clint?

Keep it up mate, love reading your threads  ;)

Offline Gnarlyscoots

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Re: ***ACS rotor twin cable mod***
« Reply #19 on: September 18, 2013, 11:57 PM »
Although it will be sporting white ACS true frequency G's  :LolLolLolLol:
I'll trade ya for my tan wall K's hunny  :-*  :-* 

Dude has pulled out on me on the G's, due to shipping, so I will now have to get someone to post them to me after I get the seller to post them  :yahoo_silent:  How hard is shipping, no matter where it goes in the world, really    ???
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Offline chubby

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Re: ***ACS rotor twin cable mod***
« Reply #20 on: September 19, 2013, 08:43 AM »
Looks ace clint, like a factory job  :bow:
What's even more amazing is you managed to do it inbetween answering a million pm's from some annoying cnut  :LolLolLolLol:  :LolLolLolLol:
WANTED : 1" freestyle forks, uglier the better

Offline mattbloke

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Re: ***ACS rotor twin cable mod***
« Reply #21 on: October 05, 2013, 04:17 PM »
i like a good bit of fiddlin, but didnt the pro rotor solve the binding problem by just using ball bearings and a guide?....

Offline GavinDavis

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Re: ***ACS rotor twin cable mod***
« Reply #22 on: October 06, 2013, 05:35 AM »
Awesome work again there Clint!  Top stuff mate  :4_17_5:

RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  ***ACS rotor twin cable mod***
 

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