The engineers at lightweight specialist Tune have been working to address the ongoing concerns of road disc brakes in the pro peloton for quite some time, and are getting ready to make their solution official. It seems that rotor guards are going to be come a real thing as a result of a few very vocal professionals. Tune have just shared with us a series of images of their most recent prototype disc brake rotor safety covers in what they are calling Project Disc Sheath. Thinking about a way to offer protection to calm the ongoing debate between the CPA & UCI, Tune is proposing a versatile safety cover that will work with a number of frames & forks to quell some of the fears about the dangers of hot, spinning rotors in the event of pile-ups in the peloton. Spin past the break with us to get a good look at Tune’s solution…

Tune’s Disc Sheath is designed to work with the 160mm rotors that have been agreed for use by the pros, and provides wrap-around protection of the sharp top edge of the rotors as well as extended protection from the side for the lower portion of the rotor. We asked them about 140mm rotors, and Tune tells us that they see less & less of the smaller rotors being spec’d on new bikes, but are open to working with pro teams or OEMs that see the need for a protection solution for other rotor sizes.

The Disc Sheaths work by simply mounting in between the flat mount brake mounts and the actual brake calipers (after you install a set of special alloy brake mount washers that ensure you can properly torque your brakes.). This moves the brake pads about 2mm further from the frame or fork, which may effectively reduce pad contact with the rotors by around half that distance. Tune sees that as a reasonable compromise to offer an almost universal fit to any frameset using the flat mount standard. This mounting style also allows for a bit of lateral adjustability so they can be tuned to perfectly fit around a variety of tube shapes and then secured in place with the brake caliper.

The design and layout also means that keeping their fixing point away from axle and wrapping around only on the upper portion of the rotor, quick wheel changes can happen with out the disc cover getting in the way, making them race friendly for both professional and amateur cyclists.

The covers are designed in a shaped way to offer stiffness to remain stable in the wind so they do not make noise on their own or allow enough flex to rub the rotors even when you get out of the saddle to climb or sprint. The covers themselves also get a strategically perforated design that minimizes their aerodynamic impact on the bike, while still providing ample airflow over the rotors for cooling.

These images are of course of their most up-to-date 3D printed prototypes, which have been developed to refine the complex shaping before the final models will be produced in molded carbon fiber to deliver the light weight and stiffness that Tune specializes in. No retail pricing has been set as that will depend a lot on the final carbon materials selected and the amount of labor that will be required to produce each one. Tune did have a production timeline in mind though, anticipating that final versions will be available to consumers and pros alike at the start of September, just after Eurobike.


  1. Undecided if covers are actually necessary but these look very nice, from the first photo I did think they were machined alloy though.

  2. Ah yes, I’ve been waiting for this solution. Finally somebody had the smarts to attach the fairings/covers to the caliper mounting brackets. Now all that is needed is some slightly redesigned mounting brackets (they’re just simple pieces of aluminium after all) and there’d be no alignment issues. You actually don’t even need to sandwich them in between the bracket and the frame, just add a pair of tapped holes to the bracket to screw the fairing/cover onto.

    Having said that, obviously these kinds of fairings/covers are complete overkill now that the latest versions of rotors are rounded. But if it helps with adoption, so be it.

        • Hot rotor burns are actually a thing (unlike rotor cuts, which just aren’t). Brake rotors can get freaking HOT after a descent. I’ve received minor 1st degree burns from a rotor on my mtb and have seen a couple 2nd degree burns (not in person though)

          Of course, depending on what plastic they used, this may just mean melted plastic on your skin.

    • But they didn’t have the smarts to put them on the other side of the mount, so the pad contact won’t change. Don’t even need extra tapped holes, just a bit of the thinks.

  3. If you want to be happy the rest of your life, never make a pretty bike your ride. So, from my personal point of view get an ugly bike to ride for you.

  4. This is the reason why I’d never use any Tune-product save their coffee mug.

    This sheath will

    – reduce pad contact
    – reduce heat dissipation

    which means

    – less braking power
    – worse modulation
    – more fading

    This is one extremely stupid solution to a non-existing problem.

    • you forgot – increase aerodynamic drag significantly.
      love how they tried to solve the heat issue by adding holes and consequently making it draggy anyway while not cooling much better.

    • Yes, why didn’t they just make it sit on the other side of the mount (ie: between the bolt and mount, instead of the mount and frame)?? This reeks of form over function and plain stupid designing.

  5. with some wind tunnel work, I’m sure someone can come up with a shield that is a net aero benefit while also having ducting that cools the rotor better than having no cover at all.

  6. I’m surprised that after the 2016 Ventoso debacle the industry didn’t introduced most of their 2017 disc models with integrated covers and some charts showing how much watts or seconds you save on a 40 miles course. Or was it too late to include them on the new chinese molds to be ready in october ?

    If fairings have to be introduced they will be integrated in the frame, a standalone solution that move the pads further back won’t appeal to anybody.

    • Pictures from Ventoso’s injury are still impressive, fairings can make sense for peloton riders and maybe a bit less for solo riders.

    • The 2016 Ventoso “debacle” was all but proven to not have been caused by a brake rotor.

      Another video has been produced where it is demonstrated that a brake rotor cannot cause the kinds of damage that people are afraid of.

      This is all a non-issue.

  7. Please tell me you’ll make pink and pastel color options to match our kits! You could save at least .5 grams by cutting linear ovals on the edge cover and increase the weight of the font…

  8. I thought that April Fool’s day jokes were over on April 1st. Seriously this is a solution to a problem that does not exist. People have been riding disc brakes for decades with no issues. Now that they are on road bikes more it is a problem.

  9. I see some advantages to road disc, maybe not for everyone but in some circumstances they make sense. But the covers are hideous and ridiculous, I refer to every version I’ve seen not just these. Might as well throw some reflectors and a big plastic spoke protector on there, maybe one of those 6 foot fluorescent yellow pennants attached to your seatstay while we’re at it.

  10. AUGH! NO I.S. MOUNT?!?!?!?! I’VE BEEN WANTING THESE FOR MY CODA BRAKES!!! Seriously. Tune doesn’t advertise here. Stop giving them coverage unless you are telling them to shut the heck up and go away. This sh!t has to stop. If you are worried about the dangers of discs in a group crash, don’t ride in that group. It’s the actual people crashing that causes problems, not the very difficult-to-contact rotors. In addition, I (and many folks in my informal and utterly non-sceintific polling over the years) have multiple chainring scars on my person, no disc scars at all, whether from slices, heat, or mystical interference.

  11. These are great. Looks very MX. That said they should really go between the bolt and caliper not caliper and fork. The latter will not affect pad position in relation to the rotor. I think it looks great, would love wind tunnel data and seeing how its safety cover and not “a fairing” it might be a cheap way for the pros to get more speed.

  12. LOL @ everyone getting their panties in a bunch. No one is ever going to force you to put a cover on your disc brakes, so stop worrying about it. If the pros are gonna whine about disc brakes, and they want covers, then it’s up to them to use these or not. It’ll be just like taking off the dork disk from your rear wheel, if disc covers become factory installed. Everyone just back away from the ledge, it’s a non-issue.

    • Tune getting their stuff in the pro peloton without having to pay major sponsor dollars? Sounds like an excellent business model.

  13. The future: Disc guards added to the pile of OE cassette spoke guards littering bike shop dumpsters everywhere. The new Cat 4 mark is a burned crescent scar on your calf also…

  14. Why aren’t pros speaking out about the safety concerns surrounding potholes, cobbles, team cars, spectators, bad weather, heat exhaustion, sprint finishes, or riding bikes? Focus on the real problems here people!

  15. Aren’t rims (especially alloy) the biggest rotors possible? What about hydraulic rim brakes, I think they were a fantastic idea.

    • Yep. But it discs on road bikes is less about pragmatics and all about promoting a new fashionable look that one “has to have” and hence create sales of new bikes. I hear the next trend will be 32″ wheels – gotta keep redundancy going.

  16. These have existed for a few years already in the bike polo realm.

    Once again, the industry “comes up with” and idea that we’ve been figuring out in the trenches for years.

    Go home, bike industry. You’re drunk….

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