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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  Reaction Megabrake
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Author Topic: Reaction Megabrake  (Read 7554 times)

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Offline ED209

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Reaction Megabrake
« on: August 04, 2015, 12:14 PM »
Anyone know what nuts the Megabrake conversion that Rob Ridge did take? or what TPI it is?

Its not the normal 'axle' thread so maybe Skyway type?

Cheers  :daumenhoch:

If you have a spare nut that you can send me thats EVEN BETTER  :daumenhoch:
"Do not go gentle into that good night,
Old age should burn and rave at close of day;
Rage, rage against the dying of the light."

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WANTED : Victor DX 9/16 spindle or pedal

Offline TwoBobRob

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Re: Reaction Megabrake
« Reply #1 on: August 04, 2015, 04:03 PM »
Ed - I don't think it was a bicycle thread at all but I do stand to be corrected.

Rob Ridge is a facebook buddy - shall I ask him for you?


Offline john4130

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Re: Reaction Megabrake
« Reply #2 on: August 04, 2015, 06:51 PM »
got a couple of reaction boa's here, one 10mm and the other 8mm. the 10mm uses a m10x1 nut. the original nuts are 3mm thick and there's 3 of them.

Offline chubby

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Re: Reaction Megabrake
« Reply #3 on: August 04, 2015, 10:59 PM »
No idea what one is, megabrake sounds super cool so someone show  me what it is  :slayer:
WANTED : 1" freestyle forks, uglier the better

Offline john4130

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Re: Reaction Megabrake
« Reply #4 on: August 04, 2015, 11:27 PM »
it's a regular acs boa with the bearings replaced with sealed one's and a thicker axle.

Offline chubby

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Re: Reaction Megabrake
« Reply #5 on: August 05, 2015, 12:08 AM »
it's a regular acs boa with the bearings replaced with sealed one's and a thicker axle.

Ahhh !!!
Thought about that when I rebuilt mine the other month, didn't know it'd been done  :teef:
WANTED : 1" freestyle forks, uglier the better

Offline TwoBobRob

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Re: Reaction Megabrake
« Reply #6 on: August 05, 2015, 02:26 AM »
Not heard back from Ridger yet.

Taking John4130's info, I believe that pitch of 1mm makes it Metric Fine. A little more unusual but easily sourced from engineers supplies shops.


Offline ED209

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Re: Reaction Megabrake
« Reply #7 on: August 05, 2015, 08:51 AM »
cheers fellas :-)
"Do not go gentle into that good night,
Old age should burn and rave at close of day;
Rage, rage against the dying of the light."

Dylan Thomas

WANTED : Victor DX 9/16 spindle or pedal

Offline ED209

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Re: Reaction Megabrake
« Reply #8 on: August 05, 2015, 08:52 AM »
got a couple of reaction boa's here, one 10mm and the other 8mm. the 10mm uses a m10x1 nut. the original nuts are 3mm thick and there's 3 of them.

any chance of a pic of yours John :-)
"Do not go gentle into that good night,
Old age should burn and rave at close of day;
Rage, rage against the dying of the light."

Dylan Thomas

WANTED : Victor DX 9/16 spindle or pedal

Offline john4130

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Re: Reaction Megabrake
« Reply #9 on: August 05, 2015, 05:39 PM »
i'll post up a couple of pics tomorrow.

Offline ED209

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Re: Reaction Megabrake
« Reply #10 on: August 05, 2015, 06:04 PM »
i'll post up a couple of pics tomorrow.

Cheers  :angel:
"Do not go gentle into that good night,
Old age should burn and rave at close of day;
Rage, rage against the dying of the light."

Dylan Thomas

WANTED : Victor DX 9/16 spindle or pedal

Offline TwoBobRob

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Re: Reaction Megabrake
« Reply #11 on: August 05, 2015, 11:06 PM »
Update from the man himself;

3/8"x26tpi is the correct thing. You have a Facebook PM Ed :)


Offline ED209

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Re: Reaction Megabrake
« Reply #12 on: August 06, 2015, 03:52 PM »
 :daumenhoch:
"Do not go gentle into that good night,
Old age should burn and rave at close of day;
Rage, rage against the dying of the light."

Dylan Thomas

WANTED : Victor DX 9/16 spindle or pedal

Offline Jaymz

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Re: Reaction Megabrake
« Reply #13 on: August 06, 2015, 03:59 PM »
For god sake some one post a pic of this damn thing

Offline pickle

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Re: Reaction Megabrake
« Reply #14 on: August 06, 2015, 04:56 PM »
For god sake some one post a pic of this damn thing

 ;D  glad i'm not the only one thinking that

Offline john4130

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Re: Reaction Megabrake
« Reply #15 on: August 06, 2015, 07:27 PM »
this is my 10mm reaction boa, it's not complete as i lost a bearing and the spring, it uses four sealed bearings so when tightened, it gives almost zero flex but still very smooth. best caliper brake ever.


it does indeed have a 3/8 26 tpi axle as i just tried a wheelnut on it and it fitted.
this is my 8mm one, it still uses 10mm sealed bearings but the axle reduces from 10mm down to 8mm.

Offline chubby

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Re: Reaction Megabrake
« Reply #16 on: August 06, 2015, 08:31 PM »
To the cave with a vernier  :teef:
WANTED : 1" freestyle forks, uglier the better

Offline Christhejob

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Re: Reaction Megabrake
« Reply #17 on: August 06, 2015, 08:42 PM »

Offline chubby

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Re: Reaction Megabrake
« Reply #18 on: August 06, 2015, 08:46 PM »
Any numbers on the bearings John ??? Boas measure at 18mm & Little bearings are 17 or 20mm
WANTED : 1" freestyle forks, uglier the better

Offline john4130

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Re: Reaction Megabrake
« Reply #19 on: August 06, 2015, 09:02 PM »
there are no numbers on the bearings but i ordered a vernier caliper the other day, so when it turns up i'll get the sizes of them.  :daumenhoch:

Offline chubby

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Re: Reaction Megabrake
« Reply #20 on: August 06, 2015, 09:12 PM »
there are no numbers on the bearings but i ordered a vernier caliper the other day, so when it turns up i'll get the sizes of them.  :daumenhoch:
Bet they're old odd skateboard wheel bearings or something daft. They look a snug fit from your pics & the boa arms don't appear to be modified  :chin:
WANTED : 1" freestyle forks, uglier the better

Offline fugazi

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Re: Reaction Megabrake
« Reply #21 on: August 07, 2015, 09:08 AM »
Yes pretty sure they had skateboard wheel bearings in them  :daumenhoch:
Do you grovel to your master? Do you beg like a dog?

Offline ED209

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Re: Reaction Megabrake
« Reply #22 on: August 07, 2015, 09:11 AM »
Nah... skateboard wheel bearings are LOADS bigger ... will take a pic if I can be fooked  ;D

Thanks for the pics tho John  :smitten:
"Do not go gentle into that good night,
Old age should burn and rave at close of day;
Rage, rage against the dying of the light."

Dylan Thomas

WANTED : Victor DX 9/16 spindle or pedal

Offline john4130

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Re: Reaction Megabrake
« Reply #23 on: August 11, 2015, 07:05 PM »
just measured the bearings used in the brake. o.d is 18.97mm, i.d is 9.99mm and width is 5mm incase anyone wants to have a go at making one.  :daumenhoch:

Offline oldschoolace

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Re: Reaction Megabrake
« Reply #24 on: August 11, 2015, 07:36 PM »
Easily found at those dimensions  :daumenhoch:
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