Zipp Made a Disc Brake Disc Wheel! (Page 8): Triathlon Forum: Slowtwitch Forums

Re: Zipp Made a Disc Brake Disc Wheel! [Andrew Coggan] [ In reply to ]

Oct 4, 16 13:26

Andrew Coggan wrote:

damon_rinard wrote:

Starting with a disc brake bike, removing the front disc brake (caliper & rotor) saved about 1.5 Watts of air power (@30 mph). Removing the rear saved another 1.5 Watts. Adding a rear rim brake (under BB) added about 2 Watts. Adding a TriRig front brake added another 1.5 Watts.

Sorry, missed this before...more evidence supporting my mini wind tunnel testing, and indicating that the ERO Sports testing has overestimated the magnitude of the benefit.

My early testing at San Diego LSWT also corroborates your mini tunnel tests, Andy. But I'll add that for Omni, the custom Omega X makes the bike faster than with no brake at all, by about 2 Watts. More numbers with our complete white paper in November.

--
TriRig.com

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Re: Zipp Made a Disc Brake Disc Wheel! [Andrew Coggan] [ In reply to ]

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damon_rinard

Oct 4, 16 14:24

Post #177 of 178 (2817 views)

I'd like disc brakes on tandems more if the failure mode were simply warped rotors.
Unfortunately, complete loss of braking function is a failure mode that has happened in the real world.

Damon Rinard
Engineering Manager,
CSG Road Engineering Department
Cannondale & GT Bicycles
(ex-Cervelo, ex-Trek, ex-Velomax, ex-Kestrel)

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Re: Zipp Made a Disc Brake Disc Wheel! [Andrew Coggan] [ In reply to ]

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damon_rinard

Oct 4, 16 14:25

Post #178 of 178 (2810 views)

Yep, your tunnel seems to be pretty good. ERO's numbers seem a little off with that test.

Damon Rinard
Engineering Manager,
CSG Road Engineering Department
Cannondale & GT Bicycles
(ex-Cervelo, ex-Trek, ex-Velomax, ex-Kestrel)

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