Home Marketplace Articles FAQ Gallery Arcade
Join FireBlades.org! Unanswered Posts New Posts Today's Posts Search Mark Forums Read
Go Back   Honda Motorcycles - FireBlades.org Forums > Motorcycle Racing > Road Racing: Professional
Why do they run such tall rear tires?

Why do they run such tall rear tires?


Road Racing: Professional: Discussion of Professional Motorcycle Road Racing, such as MotoGP, AMA, World SuperBike, etc.
Forgot your User Name or Password?
Not a member? Join today!





Why do they run such tall rear tires?

Reply
 
Thread Tools
Old 01-26-2004, 1:06 PM
  #1
So easy a ...
 
fl-929's Avatar
 
Join Date: 10-26-2001
Location: South Florida
Bike(s): 01 929
Age: 39
Posts: 1,281
Rep: fl-929 will become famous soon enough (73)
Rep Power: 9
Why do they run such tall rear tires?
195/70's

http://www.amasuperbike.com/image/da...4/1/sstire.jpg

__________________
01 929

Florida Trackdays
fl-929 is offline  
View fl-929's Profile View fl-929's Gallery Visit fl-929's homepage! Find More Posts by fl-929
Reply With Quote Go To Top
Old 01-26-2004, 1:23 PM
  #2
 
Trackho's Avatar
 
Join Date: 12-21-2001
Location: NorCal
Bike(s): 1000RR
Posts: 925
Rep: Trackho will become famous soon enough (61)
Rep Power: 7
Re: Why do they run such tall rear tires?
Most of the slicks in the past were run on 16.5 rims, looks like these are 17s. I think they like a higher profile on the slicks for more gushiness in turns

LTL can prolly provide a more accurate depiction--but hes in Europe for the next 2 weeks
Trackho is offline  
View Trackho's Profile View Trackho's Gallery Find More Posts by Trackho
Reply With Quote Go To Top
Old 01-26-2004, 2:10 PM
  #3
 
abtech's Avatar
 
Join Date: 06-05-2001
Location: Murder City, Michigan
Bike(s): 2007 RC51
Age: 58
Posts: 8,271
Rep: abtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud of (1219)
Rep Power: 28
Re: Why do they run such tall rear tires?
Why do they run such tall rear tires?

because they can . . .

Actually 195/70 is pretty close to the same overall height as 190/60 (aspect ratios of 2.97 vs 3.17), but a hell of a lot more wall height (the flat area between the rim and the contact section). I would imagine this is for heat transfer and high speed stability, but this would only be an educated guess.
abtech is offline  
View abtech's Profile View abtech's Gallery Find More Posts by abtech
Reply With Quote Go To Top
Old 01-26-2004, 2:52 PM
  #4
 
CBRBob's Avatar
 
Join Date: 07-29-2003
Location: Central NJ
Bike(s): 99 CBR1100XX (Street), 01 CBR1000RR (Track)
Age: 41
Posts: 1,524
Rep: CBRBob is on a distinguished road (43)
Rep Power: 7
Re: Why do they run such tall rear tires?
You are both right. Taller sidewalls give an artificial suspension effect (gushiness? LOL) more air inside the tire as well.
CBRBob is offline  
View CBRBob's Profile View CBRBob's Gallery Visit CBRBob's homepage! Find More Posts by CBRBob
Reply With Quote Go To Top
Old 01-26-2004, 3:09 PM
  #5
So easy a ...
 
fl-929's Avatar
 
Join Date: 10-26-2001
Location: South Florida
Bike(s): 01 929
Age: 39
Posts: 1,281
Rep: fl-929 will become famous soon enough (73)
Rep Power: 9
Re: Why do they run such tall rear tires?
Quote:
Originally Posted by CBRBob
You are both right. Taller sidewalls give an artificial suspension effect (gushiness? LOL) more air inside the tire as well.
Wouldn't that cause the rear tire to carry more heat? Also, going around Daytona, I don't know if I would want to feel any "gushyness".
__________________
01 929

Florida Trackdays
fl-929 is offline  
View fl-929's Profile View fl-929's Gallery Visit fl-929's homepage! Find More Posts by fl-929
Reply With Quote Go To Top
Old 01-26-2004, 3:54 PM
  #6
 
Join Date: 04-17-2002
Location: Montreal, Quebec
Bike(s): GSX-R1000K4 Ltd
Posts: 2,469
Rep: GhostRider is on a distinguished road (11)
Rep Power: 9
Send a message via MSN to GhostRider
Re: Why do they run such tall rear tires?
Is it gushiness? or gushyness?
GhostRider is offline  
View GhostRider's Profile View GhostRider's Gallery Find More Posts by GhostRider
Reply With Quote Go To Top
Old 01-26-2004, 4:10 PM
  #7
 
abtech's Avatar
 
Join Date: 06-05-2001
Location: Murder City, Michigan
Bike(s): 2007 RC51
Age: 58
Posts: 8,271
Rep: abtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud of (1219)
Rep Power: 28
Re: Why do they run such tall rear tires?
Quote:
Originally Posted by fl-929
Wouldn't that cause the rear tire to carry more heat? Also, going around Daytona, I don't know if I would want to feel any "gushyness".
More rubber = more dissipation surface that isn't in contact with the ground, more air pressure = less temp, although I doubt the tire is actually carrying much more air pressure, just volume.
abtech is offline  
View abtech's Profile View abtech's Gallery Find More Posts by abtech
Reply With Quote Go To Top
Old 01-26-2004, 5:57 PM
  #8
 
luvtolean's Avatar
 
Join Date: 08-01-2001
Location: Lost
Bike(s): Puch
Posts: 14,391
Rep: luvtolean has much to be proud ofluvtolean has much to be proud ofluvtolean has much to be proud ofluvtolean has much to be proud ofluvtolean has much to be proud ofluvtolean has much to be proud ofluvtolean has much to be proud ofluvtolean has much to be proud ofluvtolean has much to be proud of (1211)
Rep Power: 34
Re: Why do they run such tall rear tires?
Polly vou Francais? While my e-mails download...

Definately more air volume. This means the tire can absorb little bumps in corners better aiding traction. They definately feel "marshmellowy". A bit of delay on corner entry, and easier to slide.

More air volume is good as you get less pressure effects...but in bikes this isn't a real problem...otherwise racers would do like car guys and use nitrogen.

I felt it had more contact patch (more traction, a bit slower to turn), you seem to be able to throttle it up earlier, although an early drive has never been my strong suit.

I have been told it aids in "spring" off the corner by riders better than me, but I never felt this effect.

Dunlop also offers many of the "trick" compounds only in 16.5", this is a very good reason to use the size.

Typed this after plenty of good "vin rogue", YMMV...
luvtolean is offline  
View luvtolean's Profile View luvtolean's Gallery Find More Posts by luvtolean
Reply With Quote Go To Top
Old 01-26-2004, 6:10 PM
  #9
 
Baketech's Avatar
 
Join Date: 02-10-2002
Location: Hoosierland, USA
Bike(s): CBR929 - VFR800 - VFR800
Posts: 11,098
Rep: Baketech has much to be proud ofBaketech has much to be proud ofBaketech has much to be proud ofBaketech has much to be proud ofBaketech has much to be proud ofBaketech has much to be proud ofBaketech has much to be proud ofBaketech has much to be proud ofBaketech has much to be proud ofBaketech has much to be proud of (1302)
Rep Power: 31
Re: Why do they run such tall rear tires?
[Minor ThreadJack]

Looking at that tire, you can see quite a few radial "ribs" on the sidewall....far more than the normal flash lines from the mold segments.

Is this intentional.....to maybe break up the boundary layer of air on the sidewall and dissipate more heat?
__________________
Sith Apprentice
CBR929 - VFR800 - VFR800
"There is a grey blur, and a green blur. I try to stay on the grey one..." - Joey Dunlop
Baketech is offline  
View Baketech's Profile View Baketech's Gallery Visit Baketech's homepage! Find More Posts by Baketech
Reply With Quote Go To Top
Old 01-26-2004, 6:13 PM
  #10
Mr. Brownstone
 
Join Date: 02-07-2002
Location: UT
Bike(s): 05 600RR
Posts: 10,531
Rep: BDA116 has a brilliant futureBDA116 has a brilliant futureBDA116 has a brilliant futureBDA116 has a brilliant futureBDA116 has a brilliant futureBDA116 has a brilliant futureBDA116 has a brilliant futureBDA116 has a brilliant futureBDA116 has a brilliant futureBDA116 has a brilliant futureBDA116 has a brilliant future (1823)
Rep Power: 35
Re: Why do they run such tall rear tires?
I think it's just 'ribbed' for the rider's pleasure. :wink:
BDA116 is offline  
View BDA116's Profile View BDA116's Gallery Find More Posts by BDA116 My Map Location
Reply With Quote Go To Top
Old 01-26-2004, 6:16 PM
  #11
 
abtech's Avatar
 
Join Date: 06-05-2001
Location: Murder City, Michigan
Bike(s): 2007 RC51
Age: 58
Posts: 8,271
Rep: abtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud ofabtech has much to be proud of (1219)
Rep Power: 28
Re: Why do they run such tall rear tires?
Quote:
Originally Posted by BDA116
I think it's just 'ribbed' for the rider's pleasure. :wink:
abtech is offline  
View abtech's Profile View abtech's Gallery Find More Posts by abtech
Reply With Quote Go To Top

 
About Blog Links Contact Staff Rules Link To Us Legal Privacy Sitemap
Top

Copyright © 2006 FireBlades.org. All Rights Reserved. FireBlades.org is not affiliated with, nor endorsed by, any motorcycle manufacturers.
Best viewed at a resolution of 1024x768 or higher. SEO by vBSEO ©2007, Crawlability, Inc. All times are GMT -4. The time now is 11:04 AM.

FireBlades.org RSS2 Feed   Add to Google   Add to My Yahoo!   Add to My MSN

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85

Powered by vBulletin. Copyright ©2000 - 2007, Jelsoft Enterprises Ltd.