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Home > Forum > Triathlon Forum > Most aero disc rotor (Sram/Shimano/others?)

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Most aero disc rotor (Sram/Shimano/others?)
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captainolek
Nov 27, 19 9:49
Post #1 of 8 (3152 views)
Hi,

I've recently read that Sram claims they have improved aero performance of their latest rotors (centerline Xr) compared to the previous iteration (centerline x).

Is there any study/testing out there that compares aero performance of Sram rotors vs Shimano rotors vs anything else? I wonder which rotor is the most aero and what savings you can typically get? I realize the savings are probably minimal, but I thought it would be interesting to hear people's thoughts on that.

Thanks
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Re: Most aero disc rotor (Sram/Shimano/others?) [captainolek] [ In reply to ]
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jimatbeyond
Nov 27, 19 9:55
Post #2 of 8 (3147 views)
I don't think that there are any independent aero tests on rotors.
Last edited by: jimatbeyond: Nov 27, 19 11:15
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Re: Most aero disc rotor (Sram/Shimano/others?) [captainolek] [ In reply to ]
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frenchieTT
Nov 27, 19 12:23
Post #3 of 8 (3079 views)
Most aero rotor is no rotor. :-)
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Re: Most aero disc rotor (Sram/Shimano/others?) [captainolek] [ In reply to ]
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SuperDave
Nov 27, 19 13:45
Post #4 of 8 (3025 views)
captainolek wrote:
Hi,

I've recently read that Sram claims they have improved aero performance of their latest rotors (centerline Xr) compared to the previous iteration (centerline x).

Is there any study/testing out there that compares aero performance of Sram rotors vs Shimano rotors vs anything else? I wonder which rotor is the most aero and what savings you can typically get? I realize the savings are probably minimal, but I thought it would be interesting to hear people's thoughts on that.

Thanks

I did some WinTunnel testing on Dura-Ace vs. XTR and 160mm vs. 140mm rotors before I completed my bike set up for US Road Natz last year. The differences between those 4 options was small.

-Dave
https://www.kickstarter.com/...bike-for-the-new-era
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Re: Most aero disc rotor (Sram/Shimano/others?) [captainolek] [ In reply to ]
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aka_finto
Nov 27, 19 16:55
Post #5 of 8 (2955 views)
It’s small but measurable: https://www.parcours.cc/pages/aerodynamics_disc[/url]

Also I remember it being interesting to see there’s a measurable difference between a 160mm rotor & a 140mm rotor
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Re: Most aero disc rotor (Sram/Shimano/others?) [frenchieTT] [ In reply to ]
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jimatbeyond
Nov 27, 19 17:09
Post #6 of 8 (2945 views)
I was going to say that.
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Re: Most aero disc rotor (Sram/Shimano/others?) [aka_finto] [ In reply to ]
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captainolek
Nov 27, 19 22:50
Post #7 of 8 (2879 views)
Great thanks for sharing! Exactly the type of data I was looking for

I tend to understand the aero penalty of a larger rotor (160mm v 140mm) but I don’t really see how sram’s rotor that has much more holes in it can be more aero than the « surface-filled » equivalent from Shimano?
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Re: Most aero disc rotor (Sram/Shimano/others?) [aka_finto] [ In reply to ]
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jaredhartshorn
Nov 28, 19 15:37
Post #8 of 8 (2736 views)
Yeah that looks like a nice graph of their wheels only, but how about when it interacts with real-world yaw (lets saw, up to 12 degrees) when the wheel is actually between a set of forks?

I'd also assume that the increase of 0.3w of drag moving from Sram to Campy or Shimano is within margin of error even at 30mph?
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