Wave rotors -Petal rotors - are they really better? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 28 Old 07-12-2019, 09:31 PM Thread Starter
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Wave rotors -Petal rotors - are they really better?

Some of the newer model bikes coming out have these petal type rotors or Wave rotors.
Even the dirt bikes have them too.

What benefits do these offer over standard rotors ?

Is this something that might show up in the Vstroms Future ?

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post #2 of 28 Old 07-12-2019, 10:53 PM
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They are supposed to be better at not warping when hot. My Tenere has them and I can not feel any difference. But to be honest I have never really used my brakes hard enough to matter I guess.

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post #3 of 28 Old 07-12-2019, 11:14 PM
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They help keep things clean, the crud gets hit by the cut-outs and is thrown clear.

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post #4 of 28 Old 07-13-2019, 12:41 AM
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I know for a long time they seemed to be a Kawasaki signature.
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post #5 of 28 Old 07-13-2019, 04:04 AM
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You can buy wave rotors from eBay now m- I've installed them on two 650's. The big advantage of the more mellow ones was offroad where they cleared grit off the pads a lot better, they do work better than OEM pads all round though, particularly in wet conditions.

Downside, not recommended with sintered pads as they wear quickly. Off road with organic pads though they are noticeably better.
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post #6 of 28 Old 07-13-2019, 10:39 PM
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Gotta think

Usually more rotor mass is better, especially for sporty street bikes where the brakes are likely to be used hard. On dirt bikes, I can see that they might self-clean better than solid rotors.

Moslyl I think they are for visual appeal rather than performance.
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post #7 of 28 Old 07-14-2019, 12:03 AM
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Wave rotors originated in dirt bikes years ago for their self cleaning benefits and have since migrated on to other bikes for some practical but mostly styling benefit.

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post #8 of 28 Old 07-14-2019, 08:18 AM
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+1 on the above.

We sell a lot of brake lines. It is an upgrade that results in tangible improvement. The upgrade does what is claimed.

The reps occasionally call me in an effort to market their brake discs. My response is always that i have owned over 40 motorcycles in my lifetime and never once needed to replace a brake disc.

That isn't to say that people don't experience warped discs, but with modern floating discs it is truly rare.

Wave rotors make a difference for guys riding true dirt bikes in muddy conditions. In the same conditions on a V-Strom you would not need brakes since that kind of mud would have already locked up the front wheel between the tire and fender.

I strongly suspect the greatest improvement a person can make to their V-Strom (unwarped) disc is to de-glaze it and the pads. I think it is overlooked because we are programmed from the moment we start watching TV that to get an improvement we need to buy something.

This video shows the deglazing the disc, but the pads can need deglazing as well.

Last edited by richlandrick; 07-14-2019 at 08:27 AM.
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post #9 of 28 Old 07-14-2019, 12:42 PM
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I agree that wave rotors score more points for styling than for the fractional physics gains. I have never put them on any of my bikes.

The only time I gave them any serious consideration was on that BMW K1200rs I had for a few years. It didn't suffer from a lack of power so the rotational inertia penalty didn't matter. That bike was genetically over weight and had the telelever suspension so saving 4 pounds of rotor weight, while tempting, was still no sale.

What made me think about getting wave rotors was brake fade when riding in the Sierra mountains. After 30 - 40 minutes of carving my way down a mountain the brakes would heat up enough that I'd have to alter my pace. At one point, I replaced the front pads with some boy-racer units which helped but they were really (yikes) bad when operating at more normal riding conditions. I even bought another 2 OEM pads and tried a combo of both street and race pads on the front end. Yes it proved to be a compromise _ at best. I could not find any definitive specs saying how much cooler wave rotors would run. I did not want to join that lottery so I sold the bike.

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post #10 of 28 Old 07-14-2019, 03:36 PM
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The angled outside edges of the wave rotors create a continuous cleaning edge - helps clear the disc of dirt. Which is why they're so prevalent in the dirt world. As seen on street bikes, there's no real benefit other than that they look cool. Sometimes looking cool is reason enough.

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