Some geeky numbers about brakes - Honda RC51 Forum : RC51 Motorcycle Forums
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 07-04-2014, 04:37 AM Thread Starter
Senior Member
Hanberg's Avatar
Join Date: Feb 2009
Posts: 283
Mentioned: 2 Post(s)
Quoted: 14 Post(s)
Some geeky numbers about brakes

So I stumbled across some statistics about brakes on the internet, and remembering how much I was around when shopping for new brakes, I thought this might help some going in the right direction.

A general design rule-of-thumb for twin rotor brake systems is as follows:

30:1 - soft feel
27:1 - sweet spot for design
23:1 - firm feel
20:1 - wooden feel

You find the number by dividing the surface area of the pistons (calipers and M/C)

SP1 OEM calipers (34/32) = 6848,4 mm2
SP2 OEM calipers (32/30) = 6044,6 mm2

SP1 M/C (19mm) = 283,5 mm2
SP2 M/C (16mm) = 201,0 mm2

SP1 OEM = 24:1
SP2 OEM = 30:1

Not having tried a SP2, Im guessing the brakefeel should be a lot softer? - my little build :-)

Last edited by Hanberg; 07-04-2014 at 04:40 AM.
Hanberg is offline  
Sponsored Links
post #2 of 2 (permalink) Old 07-04-2014, 04:55 AM
Senior Member
pbc0's Avatar
Join Date: Jul 2012
Location: Bolton Nr. Manchester
Posts: 219
Mentioned: 0 Post(s)
Quoted: 5 Post(s)
Thats good info. Thanks for sharing.

Funny how both models jump past the sweet spot ratio in opposite directions is'nt it.

What ratio did you end up with?
pbc0 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Honda RC51 Forum : RC51 Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome