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-   -   Why don't motorcycles have tire deflectors? (https://ecomodder.com/forum/showthread.php/why-dont-motorcycles-have-tire-deflectors-33626.html)

Daschicken 03-28-2016 10:44 PM

Why don't motorcycles have tire deflectors?
 
2 Attachment(s)
We all know that a properly designed and placed tire deflector(spat) can reduce drag on cars, why don't motorcycles use them too? (on rear wheels) I have been looking at aero focused production motorcycles like the BMW K1000 and the Suzuki Hayabusa and have not noticed any sort of tire deflectors. It seems like an easy drag reduction mod to me, is there something i'm missing?

Attachment 19834Attachment 19835

Michael Moore 03-29-2016 12:04 AM

By spats you mean enclosing the rear wheel as on a Vincent Black Prince?

http://www.wired.com/wp-content/uplo...ack-Prince.jpg

Fat Charlie 03-29-2016 10:06 AM

Quote:

Originally Posted by Daschicken (Post 510073)
It seems like an easy drag reduction mod to me, is there something i'm missing?

You're missing the overall goal, which is styling that makes things look powerful.

Daschicken 03-29-2016 10:31 AM

1 Attachment(s)
Quote:

Originally Posted by Michael Moore (Post 510082)
By spats you mean enclosing the rear wheel as on a Vincent Black Prince?

http://www.wired.com/wp-content/uplo...ack-Prince.jpg

No, I mean a air deflector to push air down or to the sides like cars have. I drew a picture of one here.
Attachment 19850

spacemanspif 03-29-2016 06:58 PM

Do bikes need a spat with their domed tires? Car tires present a flat surface with a lot of tread to the leading air, but bike tires are round with little tread...could the benefit of a spat be so little that it's not worth adding to the vehicle?

Grant-53 03-29-2016 10:22 PM

The ground clearance on a motorcycle is roughly half that of a car. The wheelbase is much shorter also. So the cost effectiveness may not be much. Do the A-B-A test and find out. What gets measured gets improved.

niky 04-01-2016 01:59 AM

Quote:

Originally Posted by spacemanspif (Post 510136)
Do bikes need a spat with their domed tires? Car tires present a flat surface with a lot of tread to the leading air, but bike tires are round with little tread...could the benefit of a spat be so little that it's not worth adding to the vehicle?

I'm thinking this is the reason. Not much need for a spat if the tire is already relatively streamlined. Perhaps enclosing the tire completely at the sides would make more sense, to remove turbulence.

Fat Charlie 04-01-2016 11:24 AM

From a purely aero perspective, the wheels are probably the least dirty part of a bike.

minimac 04-03-2016 01:50 PM

Have you ever rode a bike with solid wheels? Side winds blow you all over the road. Enclosed tires on a motorcycle is only a good idea if the body is streamlined.

veloman 05-17-2016 12:08 PM

Fuel efficiency is far far down the list of importance for the industry.


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