When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Anyone running the larger 320mm front rotor? I am thinking of upgrading the front and rear brakes and came across several front brake rotor upgrades. TC bros makes a 12.6" (320mm) rotor kit.
I ordered the bracket to see if it will fit with the Wilwood caliper. Looks like it should. I need new rotors anyway so it's only $99 for the bracket to move to the larger rotor. I'm thinking of upgrading to a 4-piston rear brake as well. Couple all that with some floating rotors and new pads and I imagine the braking should be much improved.
Last edited by OCSpringer; May 16, 2026 at 09:08 AM.
I got the bracket and it fits up with the wilwood caliper, so I ordered the 320mm floating front rotor and matching 11.5" floating rear. Also ordered the 4 piston rear caliper which uses the same pads as the wilwood (hopefully it fits). It seems to be a knockoff of the performance machine caliper that is no longer available. I'm also going to install a front brake light switch while I'm at it so I don't always need to drag the rear brake when I stop.
Sounds like you've already got it all handled, but FWIW, Arlen Ness has
some 14" rotors and caliper relocation brackets that would work.
Here's a picture of cvaria's sporty with the AN rotors and the HD-Brembo
Touring calipers...
Pretty sweey setup. I've always been a fan of that bike. I'm not sure they make that setup anymore for the Sportsters. I have seen the eBay knock off's though.
Last edited by OCSpringer; May 2, 2026 at 11:14 AM.
Pretty sweey setup. I've always been a fan of that bike. I'm not sure they make that setup anymore for the Sportsters. I have seen the eBay knock off's though.
Granted I have not looked recently either, but if I remember correctly,
he actually used Dyna parts...
Finally got all the parts together to do the new 320mm front rotor, 4 piston rear caliper, and 48 tooth sprocket. Going to swap out my SS rear brake line for a black SS line to match the front while I'm at it. Also going to add a sprocket lock so I don't have to red loctite the sprocket bolts in order to make sprocket changes a little easier. Got a few other odds and ends to replace while I have all that apart.
Last edited by OCSpringer; May 16, 2026 at 12:42 AM.
Finally had the chance to really look at this rear brake. It's pretty sweet. It's nice to see an option out there for a nice rear brake for the rigid mount sportsters. When my orginal rear brake started leaking I looked for aftermarket options and there were none. Performance machine had stopped making theirs. This looks to be a copy of the PM mount with a different caliper. The caliper is really nice. Says made in the U.S.A. Hopefully it fits.
Finally had the chance to really look at this rear brake. It's pretty sweet. It's nice to see an option out there for a nice rear brake for the rigid mount sportsters. When my orginal rear brake started leaking I looked for aftermarket options and there were none. Performance machine had stopped making theirs. This looks to be a copy of the PM mount with a different caliper. The caliper is really nice. Says made in the U.S.A. Hopefully it fits.
...snip...
That does look nice! Did that also come from TC Bros ? I quickly glanced at their Sportster webpages
but I did not see this same bracket/caliper listed.
It's from Custom Chrome USA. I bought it from their Ebay store. It's not on their website, so I am guessing it is old stock they are selling off. The labels on the packaging looked pretty aged.
Slideshow: Jason Momoa's latest restoration project blends 1920s Harley-Davidsons with modern electric technology, creating some of the most unusual hybrid motorcycles ever built.
Harley-Davidson Fat Boy Becomes a Dark, Decepticon-Inspired Custom
Slideshow: Killer Custom's latest build relies on styling changes rather than performance upgrades, giving the cruiser an entirely different personality.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
320mm front rotor upgrade
