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The 2-Stroke Garage => Turning Wrenches => Topic started by: vmx51 on October 29, 2020, 05:49:28 PM

Title: Modern front brake caliper.
Post by: vmx51 on October 29, 2020, 05:49:28 PM
Has anyone fitted a modern caliper , but kept the stock RD250/350 disc. Any brackets out there ?
Title: Re: Modern front brake caliper.
Post by: Dvsrd on October 29, 2020, 06:25:57 PM
Quote from: vmx51 on October 29, 2020, 05:49:28 PM
Has anyone fitted a modern caliper , but kept the stock RD250/350 disc. Any brackets out there ?
Not quite. But I went from the OEM (Euro model) dual disc setup on my 77 XS 650, to a single 320 mm floating ISR disc and a 4 pot Brembo caliper/ 13 mm Brembo MC. I made the caliper bracket myself, from 12mm 6082T6.  This setup gave a massive weight reduction, massive brake and suspension improvement.
Now, regarding using a modern caliper with a stock RD disc really doesn't exploit the advantages of a 4 pot caliper. The swept area is way too wide for a modern caliper, and the RD disc is 7 mm thick. These factors make it  heavy for its size. A 300-320 mm floating disc, made for 4 pot calipers, will be a lot lighter, and give better brakes as well.
Title: Re: Modern front brake caliper.
Post by: pdxjim on October 29, 2020, 06:30:26 PM
Blue/gold spot caliper off the R6/R1 is the most popular choice.

Garrett GRA2STROKES on here makes a bracket to fit to the RD350/400 forks using an FZR/Ducati disc.

No sure if he has any in stock, but it's worth an ask.
Title: Re: Modern front brake caliper.
Post by: Dvsrd on October 29, 2020, 06:36:40 PM
Deleted. Dual post. Sorry.
Title: Re: Modern front brake caliper.
Post by: Dvsrd on October 29, 2020, 06:44:51 PM
Quote from: pdxjim on October 29, 2020, 06:30:26 PM
Blue/gold spot caliper off the R6/R1 is the most popular choice.

Garrett GRA2STROKES on here makes a bracket to fit to the RD350/400 forks using an FZR/Ducati disc.

No sure if he has any in stock, but it's worth an ask.
At least IMHO, both the "40 mm" and "65 mm" 4 pot Brembo calipers look better and have a more "bracket friendly" mounting lug location. If using FZR or R6 forks, eliminating the need for adapter brackets, it is a different story.
Also, be aware that the very common Ducati discs with round holes in the (steel  !  ) carrier are quite a bit heavier than the alloy hub/carrier versions. On a lightweight RD, keeping unsprung weight low is sort of important.......
Title: Re: Modern front brake caliper.
Post by: rodneya on October 29, 2020, 07:24:43 PM
Would something like a blue dot caliper even fit over the thick stock disk?
Title: Re: Modern front brake caliper.
Post by: oxford on October 29, 2020, 07:27:28 PM
A stock disc can be thinned down to 5mm.
Title: Re: Modern front brake caliper.
Post by: rodneya on October 29, 2020, 07:59:59 PM
Quote from: oxford on October 29, 2020, 07:27:28 PM
A stock disc can be thinned down to 5mm.

If its been drilled, then you are hooped.
Title: Re: Modern front brake caliper.
Post by: pdxjim on October 29, 2020, 08:14:07 PM
Quote from: rodneya on October 29, 2020, 07:24:43 PM
Would something like a blue dot caliper even fit over the thick stock disk?

I have them on my LC with stock 5mm discs.

Not much more room than that.

Title: Re: Modern front brake caliper.
Post by: Kawtriplefreak on October 29, 2020, 08:15:24 PM
We used an R6 disc
(https://i.postimg.cc/02g9DXcH/20171127-170730.jpg) (https://postimg.cc/bdTXjgXQ)
Title: Re: Modern front brake caliper.
Post by: m in sc on October 29, 2020, 10:29:53 PM
you can us e a1 pc daytona or xs disc, notably thinner.
Title: Re: Modern front brake caliper.
Post by: vmx51 on October 31, 2020, 09:00:29 AM
I want to keep the RD disc as I already had it thinned and drilled by joe spooner.
Title: Re: Modern front brake caliper.
Post by: Dvsrd on October 31, 2020, 02:55:59 PM
 :patriot:
Quote from: vmx51 on October 31, 2020, 09:00:29 AM
I want to keep the RD disc as I already had it thinned and drilled by joe spooner.
As the stock RD caliper is actually quite good (has larger pistons than most), you will get a significant improvement from a smaller master cylinder. Between 12 and 14 mm bore, depending on personal taste. Recently, someone recommended the 14 mm MC from an SR400. I use a 13 mm Brembo with the stock type caliper, and really like it. A buddy had a 1/2" Grimeca on his RD, and it was good too. With a good, braided line, careful bleeding and good pads, you'll squeal the front tyre with 2 fingers. For a lighter setup, EC have reproduction RD calipers in aluminum alloy. These will actually be lighter than a R1/R6 blue spot caliper, plus bracket and extra bolts.
Also, at least IMHO, mounting a 4 pot caliper with a bracket, in the stock location, just looks weird ( sorry, Kawatriplefreak  :whistle:) If anything, it will increase the risk of tank slappers, as it lowers the resonant frequency of the fork by moving the caliper away from the steering axis. This can be mitigated by swapping the fork legs, having the brake on the LH side.
Again, using a modern 4 pot caliper on an old school disc, like an RD, makes little sense. Certain calipers are designed to work with a certain type of discs.
If someone, really, really wants to use a 4 piston caliper on stock size disc, the disc could be drilled out more where the pads do not touch. Or use a disc hub from a 73-76 XS650, and machine the RD rotor to fit. The XS disc hub looks just like an RD hub, only 30 or 31 mm larger diameter. (The XS disc is 298 mm)
Title: Re: Modern front brake caliper.
Post by: Dvsrd on October 31, 2020, 03:20:16 PM
For reference, post#22 in this thread has a pic of my XS front end:
http://www.xs650.com/threads/77-xs650-dual-disc-upgrade.54521/page-2#post-590792
Title: Re: Modern front brake caliper.
Post by: oxford on October 31, 2020, 10:03:56 PM
Quote from: Dvsrd on October 31, 2020, 02:55:59 PM
If someone, really, really wants to use a 4 piston caliper on stock size disc, the disc could be drilled out more where the pads do not touch.

I think on a rd there are far better (easier) options but this would be possible for a stock rotor.  These are pictures of a stock Kawi triple rotor and one that has been modified.  The same could be done to a stock rd rotor, thin it down to 5mm, cut the sections out where the pads don't contact and drill it.

Stock rotor

(https://www.hobby-machinist.com/data/attachments/117/117756-a139dbcf38268819ea02b9d474c4fbe0.jpg)

Modified rotors.

(http://i927.photobucket.com/albums/ad116/mmkawtrp/WP_000157_zps861246df.jpg)
Title: Re: Modern front brake caliper.
Post by: Dvsrd on November 01, 2020, 04:53:38 AM
Excactly what I suggested. If using a modern caliper with stock 70s discs, get rid of unnecessary material and weight where it's not needed.
Even using the same calipers as stock RDs, TZ discs were drilled between the M6 bolts holding them to the carrier, like in the attached pic.

As for commonly available calipers, I definitely prefer Brembo over oem Yamaha blue/ gold spot.
Here's why:
Blue spot has 26 and 30 mm pistons, giving approx. 2476 square mm piston area.
Brembo P4 30/34 (40 mm mount hole spacing), has 30 and 34 mm pistons, and 3230 square mm.
Brembo P4/34 (65 mm mount hole spacing) has only 34 mm pistons, and 3632 square mm.
There is also a 4 pad variant of the P4/34, mainly designed for supermoto racing, and as a bolt on upgrade from 2 pad P4/34.
The numbers tell me that a P4/34 gives 50% more clamping force than a blue spot, for the same pressure. Or put differently, the same clamping force with only 67 percent of the pressure.
The two first versions of Brembo is widely available as used, and will give a neater installation if an adapter bracket is needed. As I see it, choosing a blue spot over a Brembo only makes sense if they bolt straight to your fork without an adapter bracket. 
:twocents:  (well, maybe more 2 dollars.......)
Title: Re: Modern front brake caliper.
Post by: m in sc on November 01, 2020, 07:50:01 AM
but you can run into clearance issues.  also, the blue or yellow dot in real world application works just as well on an rd as a brembo. have used all options. best option is a bigger modern disc 1st, period.
Title: Re: Modern front brake caliper.
Post by: oxford on November 01, 2020, 08:29:16 AM
Quote from: m in sc on November 01, 2020, 07:50:01 AM
but you can run into clearance issues.

This is a problem on vintage bikes trying to use a modern opposed piston calipers.  I've seen pics where the inboard side of the caliper was milled to get spoke clearance.  Using some unknown calipers it would mean at the very least disassembly and careful measuring and possibly trashing a caliper in the process.
Title: Re: Modern front brake caliper.
Post by: vmx51 on November 01, 2020, 08:31:18 AM
Has anyone tried one of the reproduction calipers from Economy Cycle ??
Title: Re: Modern front brake caliper.
Post by: Dvsrd on November 01, 2020, 09:56:24 AM
Quote from: vmx51 on November 01, 2020, 08:31:18 AM
Has anyone tried one of the reproduction calipers from Economy Cycle ??
Yes, I have one on my 350A. Works great with a 13 mm Brembo MC and a single braided line from EC. I cannot say I have noticed any flex in the caliper, but some claim that TZ racers went back to cast iron calipers in some cases.
Title: Re: Modern front brake caliper.3
Post by: Dvsrd on November 01, 2020, 10:08:36 AM
Quote from: m in sc on November 01, 2020, 07:50:01 AM
but you can run into clearance issues.  also, the blue or yellow dot in real world application works just as well on an rd as a brembo. have used all options. best option is a bigger modern disc 1st, period.
Yes, clearance issues may dictate caliper choice, especially with spoke wheels. Larger discs help with that, as the spokes angle inwards as they get closer to the rim. The optimal RD brake could maybe be a single 300 mm narrow band disc with a matching caliper.
Title: Re: Modern front brake caliper.
Post by: Jspooner on November 01, 2020, 11:11:55 AM
That is more than enough brake for an RD. It's coupled with a 13mm master from a 250 ninja.
Title: Re: Modern front brake caliper.
Post by: teazer on November 01, 2020, 11:23:57 AM
Economy caliper is super light - especially when fitted with alloy pistons.  On a race bike it would flex/expand the same way as the TZ alloy caliper did but on our drag race TZ/RD it works fine with a thin disk.
Title: Re: Modern front brake caliper.
Post by: oxford on November 01, 2020, 12:07:25 PM
Quote from: teazer on November 01, 2020, 11:23:57 AM
Economy caliper is super light - especially when fitted with alloy pistons.

Yes they are much lighter than a stock caliper, I have a set mounted on my rd with alloy pistons in them.  Pistons came from Eric at oily pipes gang.

(https://i.imgur.com/joUUzMw.jpg)
Title: Re: Modern front brake caliper.
Post by: Dvsrd on November 01, 2020, 12:19:23 PM
Quote from: Jspooner on November 01, 2020, 11:11:55 AM
That is more than enough brake for an RD. It's coupled with a 13mm master from a 250 ninja.
AP Lockheed type caliper by Grimeca? 38 mm pistons?
What would the advantage be over a stock or EC reproduction caliper?
And what size is that disc?
Title: Re: Modern front brake caliper.
Post by: Jspooner on November 01, 2020, 01:21:28 PM
Quote from: Dvsrd on November 01, 2020, 12:19:23 PM
Quote from: Jspooner on November 01, 2020, 11:11:55 AM
That is more than enough brake for an RD. It's coupled with a 13mm master from a 250 ninja.
AP Lockheed type caliper by Grimeca? 38 mm pistons?
What would the advantage be over a stock or EC reproduction caliper?
And what size is that disc?

I am not a brake expert by any means and I'm not saying there's any advantage except that I know it works and it works well and has excellent feel...........the disc is a modified XS disc thinned out to about 4.5mm and made to look like a TZ disc.
Title: Re: Modern front brake caliper.
Post by: Dvsrd on November 01, 2020, 01:29:41 PM
Quote from: Jspooner on November 01, 2020, 01:21:28 PM
I am not a brake expert by any means and I'm not saying there's any advantage except that I know it works and it works well and has excellent feel...........the disc is a modified XS disc thinned out to about 4.5mm and made to look like a TZ disc.
So a 298 mm disc from a 73-76 XS650?
Title: Modern front brake caliper.
Post by: retaRD on November 01, 2020, 01:49:42 PM
(https://uploads.tapatalk-cdn.com/20201101/c0e71d6a498b8f5af3ecfdda4a28e418.jpg)

I'm using a Ducati 320mm monster rotor, silver dot caliper (aluminum pistons) and a Yamaha warrior master from a quad.  Stainless braided line.  Best brakes out of ALL my bikes.
I laced the wheel with an XS650 hub, which has a wider flange width than the RD, so I did shave a LITTLE off the back of the caliper to clear the spokes, but with an RD hub it would've probably cleared, since the rotor is 320mm.
I took a gamble on the warrior master, as the perfect size master for the surface area of the silver dot pistons didn't offer a lot of options.  I knew the warrior quad used two 2 piston calipers with pistons that weren't large like the RD, looked factory, and were cheap and plentiful.  Worked out perfectly.

But no, not the stock rotor.  Clearance wouldn't be possible and brake performance is hugely improved with a larger modern rotor.
Title: Re: Modern front brake caliper.
Post by: Dvsrd on November 01, 2020, 02:03:30 PM
Nice setup RetaRD!
So the XS hub is wider than an RD hub from center to disc mounting flange?

Also, that specific Ducati/ Brembo disc looks great, but is heavier than most other 320 mm discs, because the hub/ carrier is steel, not aluminum.
Title: Re: Modern front brake caliper.
Post by: retaRD on November 01, 2020, 02:14:35 PM
Quote from: Dvsrd on November 01, 2020, 02:03:30 PM
Nice setup RetaRD!
So the XS hub is wider than an RD hub from center to disc mounting flange?

Also, that specific Ducati/ Brembo disc looks great, but is heavier than most other 320 mm discs, because the hub/ carrier is steel, not aluminum.
Thanks.
From what I recall, no, the rotor mating surface is the same distance from center, as I used the same rotor spacers from my earlier FZR rotor/caliper setup I ran on a stock RD hub.  I would have to check and verify that though. 

I was referring to the spoke flanges being slightly wider, which with a 298mm rotor would not easily clear an XS hub, but 320mm does enough, with some very minor shaving of the caliper. 

True, the stock Duc rotor isn't the lightest, but now that I have the setup dialed in I can try to source and aluminum hat version of the rotor.  The 320mm Duc rotor is still much lighter than a stock RD rotor with all the benefits of larger size and floating. 
Title: Re: Modern front brake caliper.
Post by: Jspooner on November 01, 2020, 02:22:38 PM
Quote from: Dvsrd on November 01, 2020, 01:29:41 PM
Quote from: Jspooner on November 01, 2020, 01:21:28 PM
I am not a brake expert by any means and I'm not saying there's any advantage except that I know it works and it works well and has excellent feel...........the disc is a modified XS disc thinned out to about 4.5mm and made to look like a TZ disc.
So a 298 mm disc from a 73-76 XS650?

Yes.
Title: Re: Modern front brake caliper.
Post by: oxford on November 01, 2020, 02:52:22 PM
Quote from: retaRD on November 01, 2020, 02:14:35 PM
Quote from: Dvsrd on November 01, 2020, 02:03:30 PM
Nice setup RetaRD!
So the XS hub is wider than an RD hub from center to disc mounting flange?

Also, that specific Ducati/ Brembo disc looks great, but is heavier than most other 320 mm discs, because the hub/ carrier is steel, not aluminum.
Thanks.
From what I recall, no, the rotor mating surface is the same distance from center, as I used the same rotor spacers from my earlier FZR rotor/caliper setup I ran on a stock RD hub.  I would have to check and verify that though. 

I was referring to the spoke flanges being slightly wider, which with a 298mm rotor would not easily clear an XS hub, but 320mm does enough, with some very minor shaving of the caliper. 



I'm not sure what XS hub you used but I had one I was going to use on the dual brake setup I pictured.  From what I remember the one I had  the flanges are 10mm overall wider than a rd350 and the disc surface was also wider.  I couldn't use that hub for the dual disc front end with stock spread rd trees. 

It was close and I didn't realize it as first as I only had one disc mounted and the hub sitting in the forks for mock-up.  It wasn't until after I did a bunch of work to the hub and had both discs mounted I found out it wasn't going to work with the calipers.  Thankfully I didn't lace the wheel yet.  I ended up having to source the tx500 hub.

This was a dual disc xs650 hub.
Title: Re: Modern front brake caliper.
Post by: Dvsrd on November 01, 2020, 04:25:27 PM
Quote from: Jspooner on November 01, 2020, 02:22:38 PM
Quote from: Dvsrd on November 01, 2020, 01:29:41 PM
Quote from: Jspooner on November 01, 2020, 01:21:28 PM
I am not a brake expert by any means and I'm not saying there's any advantage except that I know it works and it works well and has excellent feel...........the disc is a modified XS disc thinned out to about 4.5mm and made to look like a TZ disc.
So a 298 mm disc from a 73-76 XS650?

Yes.
Then it definitely looks like a Grimeca or AP Lockheed caliper is more suitable for a 298 mm disc with stock RD forks. The stock RD caliper will need a ridiculously big adapter bracket with that disc use.
Title: Re: Modern front brake caliper.
Post by: teazer on November 01, 2020, 10:44:36 PM
XS650 disks and carriers fit fine on a TZ250/350 wheel and the forks are perfect for a stock RD caliper which works just fine on a TZ.

And if you can't find a good TZ250/350 C/D/E front end or and F or G front end, try a pair of XS650 sliders on RD forks. The sliders are longer but take stock RD type calipers and work with 298mm disks.

Always more than one way to skin a feline.

Or get a complete RZ350 or FZR400 front end and upgrade wheels and brakes.
Title: Re: Modern front brake caliper.
Post by: Dvsrd on November 02, 2020, 05:30:33 AM
Quote from: teazer on November 01, 2020, 10:44:36 PM
XS650 disks and carriers fit fine on a TZ250/350 wheel and the forks are perfect for a stock RD caliper which works just fine on a TZ.

And if you can't find a good TZ250/350 C/D/E front end or and F or G front end, try a pair of XS650 sliders on RD forks. The sliders are longer but take stock RD type calipers and work with 298mm disks.

Always more than one way to skin a feline.

Or get a complete RZ350 or FZR400 front end and upgrade wheels and brakes.
Yes, I actually have a pair of 73-76 XS 650 fork sliders, to go with the stock caliper and a 298 mm disc. However,  it is not only longer, but also has a larger OD and is significantly heavier than an RD slider. Also, the axle hole / clamp area is several mm wider.  At some point, I will finish machining them down to RD dimensions. Maybe when I retire......
Title: Re: Modern front brake caliper.
Post by: Jspooner on November 02, 2020, 10:41:11 AM
Did the OPs original question ever really get answered here? Seems like lots of different options were thrown out there though. :umm:
Title: Re: Modern front brake caliper.
Post by: m in sc on November 02, 2020, 11:07:24 AM
You can thin the back of an fzr600 caliper to work on a stock rotor (ive seen this 1st hand) but ive only seen it done on a 400 mag wheel.   :twocents:

The other opinions are there because: point being, for the work involved, a larger rotor makes sense for weight reduction, better stopping power, and fitment.   
Title: Re: Modern front brake caliper.
Post by: vmx51 on November 03, 2020, 08:15:02 AM
it seems the "easiest" would be to try one of the new reproduction aluminum calipers. I am not looking for mega braking powere , just want it to work good. my original iron caliper is binding , so rathere than mess around with it , I want to try something different
Title: Re: Modern front brake caliper.
Post by: Dvsrd on November 03, 2020, 08:33:49 AM
Quote from: vmx51 on November 03, 2020, 08:15:02 AM
it seems the "easiest" would be to try one of the new reproduction aluminum calipers. I am not looking for mega braking powere , just want it to work good. my original iron caliper is binding , so rathere than mess around with it , I want to try something different
Yes, definitely. Reproduction alminum, caliper, a braided 1 piece hose, (remove the stock brake light switch) and get a 12-14 mm master cylinder with a built in brake light switch. For road riding, that is enough brake, and you will save close to 2 lbs/ 1kg of weight in the process.
Title: Re: Modern front brake caliper.
Post by: 350GUY on November 04, 2020, 09:24:30 AM
For those that are not technically inclined, just go with the 2015 Yamaha SR400 entire front suspension, inclusive of brake set-up. The rake is the same as the RD350. New tech, vintage looks and parts are not +35 years old...
Title: Re: Modern front brake caliper.
Post by: retaRD on November 04, 2020, 11:51:49 AM
Quote from: 350GUY on November 04, 2020, 09:24:30 AM
For those that are not technically inclined, just go with the 2015 Yamaha SR400 entire front suspension, inclusive of brake set-up. The rake is the same as the RD350. New tech, vintage looks and parts are not +35 years old...
Do you have that on your bike?  Any pics?
Title: Re: Modern front brake caliper.
Post by: Dvsrd on November 04, 2020, 12:18:12 PM
Seems like the SR400 has a 2 piston sliding caliper, I guess due to spoke clearance issues and cost .
A 4 pot would be better caliper. Period.
SR disc looks nice and light-ish though! See attached pic.
Title: Re: Modern front brake caliper.
Post by: m in sc on November 04, 2020, 03:06:34 PM
if a 4 pot caliper you want to use won't fit, doesnt matter how good it is sitting on the shelf....  :twocents:  i have a 4 pot brembo sitting on the shelf right now myself for later use on a project. i get it, but i mean, has to fit.
Title: Re: Modern front brake caliper.
Post by: teazer on November 04, 2020, 03:46:27 PM
There are some really nice Brembo billet calipers that are substantially thinner and lighter than regular cast calipers.  They cost a bit more too.

The pair I have came off an AF1 race bike and one is cracked, but the other I will use on a TZ one of these days if my brain doesn't explode over the election shenanigans first.
Title: Re: Modern front brake caliper.
Post by: m in sc on November 04, 2020, 03:55:49 PM
well, yeah, for sure. thats serious $ though for new. Ive looked at them, there are soem really thin calipers available particularly in the custom/aftermarket harley market of all places. https://www.jpcycles.com/product/240-0057/performance-machine-polished-replacement-caliper?utm_source=google&utm_medium=cpc&utm_campaign=PLA-Performance%20Machine-Products&utm_id=google_10875884529_103865631261_457797357984_pla-939355647966_c__240-0057_CjwKCAiAv4n9BRA9EiwA30WNDw32bnM7ruvKeDpidfEsRSm5J3P7zPdllVmxve_72QuuZisbF1rpZRoClX0QAvD_BwE&utm_term=939355647966&gclid=CjwKCAiAv4n9BRA9EiwA30WNDw32bnM7ruvKeDpidfEsRSm5J3P7zPdllVmxve_72QuuZisbF1rpZRoClX0QAvD_BwE
Title: Re: Modern front brake caliper.
Post by: rodneya on November 04, 2020, 04:30:15 PM
Quote from: m in sc on November 04, 2020, 03:55:49 PM
well, yeah, for sure. thats serious $ though for new. Ive looked at them, there are soem really thin calipers available particularly in the custom/aftermarket harley market of all places. https://www.jpcycles.com/product/240-0057/performance-machine-polished-replacement-caliper?utm_source=google&utm_medium=cpc&utm_campaign=PLA-Performance%20Machine-Products&utm_id=google_10875884529_103865631261_457797357984_pla-939355647966_c__240-0057_CjwKCAiAv4n9BRA9EiwA30WNDw32bnM7ruvKeDpidfEsRSm5J3P7zPdllVmxve_72QuuZisbF1rpZRoClX0QAvD_BwE&utm_term=939355647966&gclid=CjwKCAiAv4n9BRA9EiwA30WNDw32bnM7ruvKeDpidfEsRSm5J3P7zPdllVmxve_72QuuZisbF1rpZRoClX0QAvD_BwE

Well it is on sale, and you can do monthly payments, but its too shiny for me.
Title: Re: Modern front brake caliper.
Post by: Dvsrd on November 04, 2020, 04:35:37 PM
Quote from: m in sc on November 04, 2020, 03:06:34 PM
if a 4 pot caliper you want to use won't fit, doesnt matter how good it is sitting on the shelf....  :twocents:  i have a 4 pot brembo sitting on the shelf right now myself for later use on a project. i get it, but i mean, has to fit.
Atually, I never measured a stock RD caliper vs a Brembo or other 4 pot caliper. Still, my gut feeling is that if any 38-48 mm opposed 2 piston caliper fits, then there ought to be possible to find a 25-3 mm 4 piston caliper that fits as well.
Like mentioned before, I went from oem dual front discs and single piston (sliding) calipers on my XS650 to a single 320 and Brembo 4 pot. Those stock XS calipers are pretty rubbish IMHO, compared to the stock RD and 72-76 XS/TX calipers,  which are all the same.
Title: Re: Modern front brake caliper.
Post by: m in sc on November 04, 2020, 04:56:49 PM
i can assure you a typical brembo won't fit on a stock rotor. I've tried. I probably have 30 calipers of various types in my possession.  and yes, the slider single pistons are freaking garbage.   .