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Discussion Starter #1
Hey everyone, this is my first post here. Let me first start off by saying, no I do not have a Honda rc51. However, I ride a Honda ruckus. It isn't your every day ruckus though, I'll include a picture at the bottom of this post. I swapped disk brakes onto the ruckus from a Yamaha Zuma 50cc. I took out the ruck steering shaft and put it in the zuma triple tree to acquire disk brakes.

I just recently purchased a stock ruckus triple tree again and will be doing a new front setup. I wanted to switch out my stock zuma caliper with something a little more unique. So I've been looking around at dual piston calipers and stumbled upon the RC51 caliper from an 02-06. I realize that this is a LOT bigger caliper than my stock zuma caliper. However, I was wondering if someone could give me a rough (or exact) estimate of length. I wouldn't mind picking one of these up. It has been a toss up between a RC51 and a dual piston Tokico off an 08 Kawasaki.

Also if it isn't too much trouble to get some pictures of the shock itself. Just trying to gather an idea with how mounting would go before purchasing it. Heck even if someone has a stock left side caliper laying around that'd be great, maybe I could buy it off of them. I want to thank everyone in advance for any info that you can supply me with. And i'll continue to use the search function on the F/S threads to see if anyone has one they are parting with. Thanks again, here are some pictures.



 

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Discussion Starter #5
Just when you think you've seen it all...
Thanks...I think?

this dude was going to shove an RC51 motor in it...lmao
No not exactly. I was gonna try and put a dual piston caliper on there. I don't want to go fast. I'd hurt myself if I had a bike.


CBRBEAR: I really only need the left side (drivers side if referring to a car). I don't need both because the wheel I have doesn't accommodate 2 rotors.
 

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I would go with a smaller caliper and pads that are made to fit the disk diameter you are using.
The maximum braking force you can use is one that would lock up the wheel even in good dry pavement with the best tires. In your case this may already be too much as the frame may bend.
With the smaller diameter wheel you need pads that have more width/radius than length (side along the circumference). A single piston caliper may work best, maybe one from a dirt bike. If they have enough force to stop a 21" wheel from turning, they have plenty for a 12" wheel.
 

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Discussion Starter #10
make me a reasonable offer, i have brand new galfer pads to go with em
I honestly don't know what they are worth lol. you tell me man. it's your parts.

I would go with a smaller caliper and pads that are made to fit the disk diameter you are using.
The maximum braking force you can use is one that would lock up the wheel even in good dry pavement with the best tires. In your case this may already be too much as the frame may bend.
With the smaller diameter wheel you need pads that have more width/radius than length (side along the circumference). A single piston caliper may work best, maybe one from a dirt bike. If they have enough force to stop a 21" wheel from turning, they have plenty for a 12" wheel.
you make a valid point there. i will look into something of that nature too!
 

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A 4 piston caliper designed for 320mm discs won't sit well on a little disc designed for a 50cc scooter and your expenses to make it work (excessively) well, won't be worthwhile.

Probably better to stick with what you have & enjoy the scooter until it's performance becomes unexciting, then move onto something else - it's only natural.
 

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The point about the diameter and swept area of the rotor and use of the RC51 caliper is a valid one.

The front calipers for the RC51 (and pretty much most sport bikes) are designed around a 310 to 330mm diameter rotor.
The rotor on your ruckus is too small in diameter for the pads to fit in the swept area.

The recommendation of using a dirt bike front caliper is a better option.
Their rotors are not as large in diameter, plus they aren't as thick.
The RC51 calipers are designed for around a 4.5-5mm thick rotor.
Many dirt bikes use a two-piston front caliper that should provide ample stopping power for the ruckus.
 
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