this is an adapter for a blue or gold dot caliper to be used on aircooled rd250/350/400 front forks. use at own risk. Mine is made of 6061 aluminum. you will need to run an fzr600 or like rotor, and make a **EDIT**13mm OR 1/2" spacer behind the rotor. (center of a stock rd rotor hat also works)
this is a link to the zip file which contains a .dxf of the main adapter. https://2strokeworld.net/wp-content/uploads/2019/03/brakeadapter-r6-rd-v4.zip
i would recommend a MINIMUM thickness of 3/8" no bigger than 1/2" feel free to take the linework and modify to suit your cosmetic needs.
I JUST have the adapter in DXF format available. Any decent machine shop can get this cut, or water jet or laser shop.
This is MY file, do NOT copy and make as batch and sell for a profit, please. This is strictly for personal use for projects. If you do, and i find out, i will expose you and any personal data i have on you for the dirtbag you are. You have been warned.
You will have to fit and finish the part yourself.
(http://www.2strokeworld.net/wp-content/uploads/2019/03/rdbracket-monospine-installed_zpsh6o2zd2g.jpg)
For RZ350 owners, TDR (Tony Doukas Racing) sells the adapter for the nice beefy R1 components to bolt up to stock RZ fork lowers. A great upgrade and one finger braking but you have to exercise caution with this level of stopping ability.
Kudos to Mark for sharing the file to RD owners! :clap:
Plus one Evans on the TDR adapters. I have them on my RZ and the difference in braking is amazing!
Looks great. Any good reason to mount this rearward on opposite side of original?
I apologize for ignorance as I didn't really grow up around two strokes or race bikes. Dad had a SOHC XS400 and uncles had Harley's and Viragos...
handles better with a trailing front caliper.
Rear mounting puts the mounting in compression, which should make it stiffer, but also allow the mounting to be lighter. Also, marginally less polar moment of inertia, that's unlikely to make any real difference but it's fun to do anyways.
Thank you kind Sir.
(https://2strokeworld.net/wp-content/uploads/general-tech/brake-caliper-adapter-rd.jpg)
just fyi, with dims. Had a slow afternoon so ^
and you can download the pdf or jpg of this here (will be clearer)
pdf:
https://2strokeworld.net/wp-content/uploads/general-tech/brake-caliper-adapter-rd.pdf
jpg:
https://2strokeworld.net/wp-content/uploads/general-tech/brake-caliper-adapter-rd.jpg
Why are you guys running a heavy, semi-floating 4 pot caliper on an RD? A stock RD is 100 to 150lbs lighter with 25% of the torque and horsepower as an R1. A 2 pot floating Nissin from an SV650 with the same rotors is borderline too much brake and they're easier to adapt. Even if you're running chambers and tuned to 50-60 hp, I don't see it. It may even be less safe.
lighter by miles than a stock caliper, and basically the same as my TZR250 (which is 308lbs stock). (direct swap actually). I had 2 on my lc, it was a bit overkill but one is perfect. dont knock it till you try it.
Quote from: irk_miller on November 18, 2023, 09:35:47 PMWhy are you guys running a heavy, semi-floating 4 pot caliper on an RD? A stock RD is 100 to 150lbs lighter with 25% of the torque and horsepower as an R1. A 2 pot floating Nissin from an SV650 with the same rotors is borderline too much brake and they're easier to adapt. Even if you're running chambers and tuned to 50-60 hp, I don't see it. It may even be less safe.
Elaborate on your SV setup, with detail if possible.
I think I have a FZR setup, but don't know. Gonna need help identifying components.
But open to swapping out for other low buck options
Thanks
Quote from: This Old Daytona on December 06, 2023, 02:34:03 AMQuote from: irk_miller on November 18, 2023, 09:35:47 PMWhy are you guys running a heavy, semi-floating 4 pot caliper on an RD? A stock RD is 100 to 150lbs lighter with 25% of the torque and horsepower as an R1. A 2 pot floating Nissin from an SV650 with the same rotors is borderline too much brake and they're easier to adapt. Even if you're running chambers and tuned to 50-60 hp, I don't see it. It may even be less safe.
Elaborate on your SV setup, with detail if possible.
I think I have a FZR setup, but don't know. Gonna need help identifying components.
But open to swapping out for other low buck options
Thanks
I may have mispoke and said Nissin, but they are actually Tokico. This is a pic with Honda forks that I originally ran on my RD. The hub is also from a 500cc and above 70s Honda, which is the same rotor pattern as XS650. Initially, I had it set up with dual disc, but that was way too much brake and unnecessary weight (trying to keep the bike under 270 lbs), so I removed the right side brake.
(https://www.dotheton.com/index.php?attachments/be6a71b0-8057-4335-a207-339df5559044-jpeg.236287/)
Here it is with the right side brake still on. If you closely in the pic, it's a really simple piece of flat stock (and spacers) to make the mount for that front end.
(https://www.dotheton.com/index.php?attachments/64cf75aa-9521-4b60-970e-af1835fe74ac-jpeg.236301/)
I now have a TL1000r front end on the RD, so here is the mount for that setup:
(https://www.dotheton.com/index.php?attachments/img_3475-jpg.215827/)
(https://www.dotheton.com/index.php?attachments/img_3476-jpg.215829/)
Many thanks for this M in SC. Cool part! I was planning on making one but as I'm a bit short on time, I just sent off the dxf to Sendcutsend. Technology is a wonder! Cheers.
I recently set all of this up on My 73 Rad350, and wanted to share some pieces. I used the FZR rotor, and designed the spacer on sendcutsend. The spacer was 105mm OD, could have been a cluple mil smaller to match up with the hub, but still looks very good, and was abit too snug with 64mm ID. 65 would have probably been better. The bolt holes were 8.5mm, 80.5mm across, center to center.
The 8mm rotor bolts were perfect at 35mm. with a 1/2in caliper bracket, the fork to bracket bolts were 40mm, bracket to caliper bolts were 30mm.
My only issue is this bracket may need some tweaking. It has the caliper hanging the pads about 1/3 off the rotor, and concentrates all the heat on the top half of the rotor.
(https://i.postimg.cc/SXJM8h9T/20250509-070947.jpg) (https://postimg.cc/SXJM8h9T)
As far as this caliper being heavy, it is still way lighter than the factory unit, even with the bracket bolted on it.
My complaint about the factory setup was that even with a stainless line, it would bite hard when you first started braking it would bite hard, but it won't give me anymore past that. This new caliper will actually brake harder when I squeeze harder.
:bacon:
Quote from: Vintagewannabe on May 09, 2025, 08:29:02 AMMy only issue is this bracket may need some tweaking. It has the caliper hanging the pads about 1/3 off the rotor, and concentrates all the heat on the top half of the rotor.
Seems a little strange that your caliper is not aligning with the rotor contact surface since you're using the same bracket as others. Is is possible your rotor is smaller (298 vs 320)? :umm: The drill pattern looks a little different than other FZR rotors.
Quote from: SoCal250 on May 13, 2025, 04:53:57 PMQuote from: Vintagewannabe on May 09, 2025, 08:29:02 AMMy only issue is this bracket may need some tweaking. It has the caliper hanging the pads about 1/3 off the rotor, and concentrates all the heat on the top half of the rotor.
Seems a little strange that your caliper is not aligning with the rotor contact surface since you're using the same bracket as others. Is is possible your rotor is smaller (298 vs 320)? :umm: The drill pattern looks a little different than other FZR rotors.
It looks from measuring while on the bike its around 290.
I am confused on the size because looking up the part numbers from yamaha, it is the same part number from 89-99 on the FZR600.
Same with checking on ebc.
Others still say there are different sizes.
Now that I look close, my rotor has 4 of the small triangle cutouts on the center, where the first pic and others have 5, like a star shape.
Quote from: Vintagewannabe on May 13, 2025, 09:45:41 PMNow that I look close, my rotor has 4 of the small triangle cutouts on the center, where the first pic and others have 5, like a star shape.
I think I figured it out. It appears you have a FZR400 rotor not 600.
The 400 uses 282 mm rotors (spec from my parts book: 282 x 4 mm), while the FZR600 uses 298 mm
Here's a photo of my front wheel with 1WG rotors
20180713_170817_FZR_1WG_front wheel.jpg
Welp, at least this may help keep someone else from making the same mistake :bang:
I'll be ordering another this week
Quote from: m in sc on March 01, 2019, 12:19:07 AMthis is an adapter for a blue or gold dot caliper to be used on aircooled rd250/350/400 front forks. use at own risk. Mine is made of 6061 aluminum. you will need to run an fzr600 or like rotor, and make a **EDIT**13mm OR 1/2" spacer behind the rotor. (center of a stock rd rotor hat also works)
Mark, have you always run FZR600 rotors with your adapter setup or did I read somewhere on here that you had also run a FZR1000 disc at one point? Just curious if you had made a different adapter design for the larger 320mm disc vs. the 298mm from the 600.
I'm seriously considering upgrading the front brake on my RD400F but I'm not sure if the current adapter design posted above with work on the Daytona. I still need to do some mockup work with a FZR rotor and R6 caliper and take measurements.
its for the 'smaller' rotor. same one on the tzr i have
Quote from: m in sc on May 16, 2025, 08:20:02 AMits for the 'smaller' rotor. same one on the tzr i have
:thumbs: Thanks.
I let you know what I find out from my experiments with the R6 caliper & FZR600 rotor on the 2V0 forks & front wheel.
(https://i.postimg.cc/ZBBcRVNh/20250520-173510.jpg) (https://postimg.cc/ZBBcRVNh)
Got the new rotor in, problem solved! An amzing upgrade, very worth it.
Quote from: Vintagewannabe on May 20, 2025, 09:55:53 PM(https://i.postimg.cc/ZBBcRVNh/20250520-173510.jpg) (https://postimg.cc/ZBBcRVNh)
Got the new rotor in, problem solved! An amzing upgrade, very worth it.
I would suggest swapping your fork legs to put the caliper behind the left side.
This is a common mod to lower the CG, and reduce the swing weight.
... and look better.
^ very nice looking adapter too! :thumbs:
Quote from: pdxjim on May 20, 2025, 10:14:40 PMQuote from: Vintagewannabe on May 20, 2025, 09:55:53 PM(https://i.postimg.cc/ZBBcRVNh/20250520-173510.jpg) (https://postimg.cc/ZBBcRVNh)
Got the new rotor in, problem solved! An amzing upgrade, very worth it.
I would suggest swapping your fork legs to put the caliper behind the left side.
This is a common mod to lower the CG, and reduce the swing weight.
... and look better.
I dont want to lose my speedometer, and original gauges