Real world difference in stopping? Single vs dual
Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
Where are your links to better testing data?
Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
Extreme HDF Member
Joined: Dec 2007
Posts: 13,402
Likes: 941
From: Illinois
The size of the front contact patch and rubber compound is the limiting factor.
With the same tire a single disc can stop in the same distance. Either have the capacity to lock up the tire. It is easier to use the max stopping with a single disc because the rider needs a stronger pull on the lever which makes modulation easier.
Think about it. The same bike and tires with the same rider when doing an emergency stop will stop in the same distance. The rider will "feel" that he used less lever pressure and therefor think that the dual set up is stronger/better.
Both set ups will yield about 0.9 g's decelerations. That's on a street bike. A grand prix bike with soft tires heated up could do a little better.
My current fleet of 20 H-D's is a mixture of single and dual disc's along with ABS and non ABS. I can stop each of them in almost the same distance. The dual set ups can not and do not stop the same bike and tire combo than the other. I have single, dual and ABS Dyna's which all stop the same. It just helps my arthritic hands to not have to pull the lever as hard on the dual discs.
With the same tire a single disc can stop in the same distance. Either have the capacity to lock up the tire. It is easier to use the max stopping with a single disc because the rider needs a stronger pull on the lever which makes modulation easier.
Think about it. The same bike and tires with the same rider when doing an emergency stop will stop in the same distance. The rider will "feel" that he used less lever pressure and therefor think that the dual set up is stronger/better.
Both set ups will yield about 0.9 g's decelerations. That's on a street bike. A grand prix bike with soft tires heated up could do a little better.
My current fleet of 20 H-D's is a mixture of single and dual disc's along with ABS and non ABS. I can stop each of them in almost the same distance. The dual set ups can not and do not stop the same bike and tire combo than the other. I have single, dual and ABS Dyna's which all stop the same. It just helps my arthritic hands to not have to pull the lever as hard on the dual discs.
Last edited by lh4x4; Apr 5, 2016 at 08:02 PM.
Cruiser
Joined: Feb 2016
Posts: 149
Likes: 27
From: Quiet end of Silicon Valley
The size of the front contact patch and rubber compound is the limiting factor.
With the same tire a single disc can stop in the same distance. Either have the capacity to lock up the tire. It is easier to use the max stopping with a single disc because the rider needs a stronger pull on the lever which makes modulation easier.
Think about it. The same bike and tires with the same rider when doing an emergency stop will stop in the same distance. The rider will "feel" that he used less lever pressure and therefor think that the dual set up is stronger/better.
Both set ups will yield about 0.9 g's decelerations. That's on a street bike. A grand prix bike with soft tires heated up could do a little better.
With the same tire a single disc can stop in the same distance. Either have the capacity to lock up the tire. It is easier to use the max stopping with a single disc because the rider needs a stronger pull on the lever which makes modulation easier.
Think about it. The same bike and tires with the same rider when doing an emergency stop will stop in the same distance. The rider will "feel" that he used less lever pressure and therefor think that the dual set up is stronger/better.
Both set ups will yield about 0.9 g's decelerations. That's on a street bike. A grand prix bike with soft tires heated up could do a little better.
More effort on a lever equals better modulation? Have you ever used brake modulation effectively? It is the predecessor to ABS and it was done with your own hand.
.9 g's? You do know that one of the reasons that ABS braking distances can be beat by a good rider is because ABS is set up to max out at 1.0 g's and release and grab and release, cycling right below that 1.0 g threshold.
Chonk
Club Member
Joined: Dec 2014
Posts: 10,734
Likes: 3,755
From: SWFL
Where do measuring G's come into the picture, and why would it care how many G's are being experienced? (I guess maybe to prevent you from flying off the bike, but I doubt the contact patch of both tires can produce enough deceleration to do that, and if so, maybe you shouldn't be riding...
LOL, please clue me in on what I have and haven't ridden.
http://www.rbracing-rsr.com/zx11tubo.htm
http://www.rbracing-rsr.com/zx11tubo.htm
Club Member
Joined: Oct 2011
Posts: 11,175
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From: Nor Cal
Well, I have that one...Shhh, my mistress taking a "spin"
Btw,"did you get on either one of these?"...I get on her and off her
damn...another post count
Last edited by multihdrdr; Apr 5, 2016 at 10:39 AM.
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Outstanding HDF Member
Joined: Aug 2012
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From: Detroit
A little more information:
http://articles.sae.org/14090/
Road Master
Joined: May 2008
Posts: 809
Likes: 23
From: Olathe KS
Okay, did you just make that all up yourself or did someone help you?
More effort on a lever equals better modulation? Have you ever used brake modulation effectively? It is the predecessor to ABS and it was done with your own hand.
.9 g's? You do know that one of the reasons that ABS braking distances can be beat by a good rider is because ABS is set up to max out at 1.0 g's and release and grab and release, cycling right below that 1.0 g threshold.
Chonk
More effort on a lever equals better modulation? Have you ever used brake modulation effectively? It is the predecessor to ABS and it was done with your own hand.
.9 g's? You do know that one of the reasons that ABS braking distances can be beat by a good rider is because ABS is set up to max out at 1.0 g's and release and grab and release, cycling right below that 1.0 g threshold.
Chonk
There once was I time I promised myself I wouldn't try to talk tech on this site anymore, and now I have broken that promise. Bad Rob, Bad.
It's like some of you don't understand the basic mechanics of breathing, let alone how anything with an engine and wheels works, but you insists on chiming in anyway.
Last edited by 203Cree; Apr 5, 2016 at 07:04 PM.