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Author Topic: Modern caliper on CB450  (Read 867 times)

Offline redrover

  • Posts: 121
Modern caliper on CB450
« on: Mar 08, 2018, 20:32:29 »
Just rebuilt my carbs, adjusted the valves, changed the oil... Now I realize I need better brakes.

Goal is to install a modern (dual piston) caliper on the stock CB450 fork/wheel/rotor.

Iíve read through a ton of legendary threads of people swapping in entire front-end set ups from modern bikes, but I donít think Iím ready for that yet. Plus, Iíd like to retain the original front fender.

I like the idea of just bolting on an ex250 caliper to the stock CB450 rotor, but I understand that I will need to fab a bracket to make that work?

Wondering if anyone has completed this caliper upgrade? How did you make the bracket? Any other insights?
« Last Edit: Mar 08, 2018, 20:34:52 by redrover »

Offline redrover

  • Posts: 121
Re: Modern caliper on CB450
« Reply #1 on: Mar 09, 2018, 02:27:06 »
So as I understand it... The ex250 caliper will just directly bolt onto the stock cb450 rotor, but I would just need to fab up a bracket to get the spacing right.

I was hoping someone would have an image of one someone had already made, but Iím wondering if I just bring the entire front end to a machine shop... could they just look at it and be able to know what to do?

Offline slikwilli420

  • Posts: 186
Re: Modern caliper on CB450
« Reply #2 on: Mar 09, 2018, 13:37:24 »
Ive seen brackets that allow a 2 piston caliper (AP, Grimeca, etc) to be bolted onto the stock forks using one of the swinging bracket holes and one hole from the fender mounts by the axle.

Offline advCo

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Re: Modern caliper on CB450
« Reply #3 on: Mar 09, 2018, 13:39:38 »
I'm currently working on a swap, using EX500 rotor and cbr600 caliper. I'd think if you're gonna go through the effort of putting a better caliper, why not put a lighter and larger disc on there?
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline MiniatureNinja

  • Posts: 256
Re: Modern caliper on CB450
« Reply #4 on: Mar 09, 2018, 13:46:38 »
I'm currently working on a swap, using EX500 rotor and cbr600 caliper. I'd think if you're gonna go through the effort of putting a better caliper, why not put a lighter and larger disc on there?

are you talking an early cbr caliper? modern uses a floating rotor, wont work with rigid rotor and rigid mounted caliper
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Offline advCo

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Re: Modern caliper on CB450
« Reply #5 on: Mar 09, 2018, 13:53:37 »
are you talking an early cbr caliper? modern uses a floating rotor, wont work with rigid rotor and rigid mounted caliper

Yeah. 90's. Not sure the year exactly.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline doc_rot

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Re: Modern caliper on CB450
« Reply #6 on: Mar 09, 2018, 15:40:32 »
The issue you will likely run into is there is not enough room between the caliper and the wheel for opposing piston calipers. I had to make spacers for the rotors to fit these brembo calipers on the stock wheel with stock disks. I would look for non opposing (floating) calipers as they require less room on the back side. BTW you can have your rotor ground down and drilled for weight reduction, which will result  better stopping power. The difference between a floating caliper and rigid is a floating caliper has pistons on one side only and the caliper body moves to self center on the disk. Rigid calipers have opposing pistons that move to self center on the disk. Either will work on any type of rotor, floating rotors just make the engagement more progressive, with better "feel". If the ex250 caliper will bolt on and just needs spacers, get some washers and shim it out until you know how much you need, then see if you can find a bushing on McMaster Carr or have a machine shop make you some
« Last Edit: Mar 09, 2018, 16:01:28 by doc_rot »

Offline redrover

  • Posts: 121
Re: Modern caliper on CB450
« Reply #7 on: Mar 10, 2018, 23:20:15 »
Ive seen brackets that allow a 2 piston caliper (AP, Grimeca, etc) to be bolted onto the stock forks using one of the swinging bracket holes and one hole from the fender mounts by the axle.

So would that mean that I would need to lose the front fender? Or just bolt the bracket through there and get a slightly longer screw to also accommodate the fender mount?

(Iíd like to keep the front fender)

Offline redrover

  • Posts: 121
Re: Modern caliper on CB450
« Reply #8 on: Mar 10, 2018, 23:22:33 »
I'm currently working on a swap, using EX500 rotor and cbr600 caliper. I'd think if you're gonna go through the effort of putting a better caliper, why not put a lighter and larger disc on there?

That sounds great... Still single disc, ya?

Do you have a CB450??

Offline redrover

  • Posts: 121
Re: Modern caliper on CB450
« Reply #9 on: Mar 10, 2018, 23:59:42 »
The issue you will likely run into is there is not enough room between the caliper and the wheel for opposing piston calipers. I had to make spacers for the rotors to fit these brembo calipers on the stock wheel with stock disks. I would look for non opposing (floating) calipers as they require less room on the back side. BTW you can have your rotor ground down and drilled for weight reduction, which will result  better stopping power. The difference between a floating caliper and rigid is a floating caliper has pistons on one side only and the caliper body moves to self center on the disk. Rigid calipers have opposing pistons that move to self center on the disk. Either will work on any type of rotor, floating rotors just make the engagement more progressive, with better "feel". If the ex250 caliper will bolt on and just needs spacers, get some washers and shim it out until you know how much you need, then see if you can find a bushing on McMaster Carr or have a machine shop make you some

Thanks for your insights. Your brake setup looks stellar! Is that a CB450 also?? How did you get dual front discs? (Fork swap?)

The 2008(+) ex250 caliper is a floating caliper, itís in the mail and should be here next week (along with the master cylinder and lever). Iíll try it as soon as it arrives.

So you think that maybe I can just shim it flush with some washers and forgo the custom fabbed bracket?? What would I use the bushing for?? (Please excuse my ignorance, somewhat new to me).