99t4 said:
By my observations, most bicycle and motorcycle front disc brake calipers are mounted in the 2:00 - 2:30 o'clock position (looking from side, bike facing to the left).
Allows for secure mounting, safe transmission of force to the fork, and ample clearance for wheel/disc removal/installation.
Dont forget "looking pretty."
Decoupling the torque moment from braking from the rear swing arm is what motorcycles do. This means a fully floating caliper with a anti-torque lug in the swingarm ( all racing motorcycles this day in age).. ( those caliper mounts with the lug and the hole) ( the Dukes, Kwakers, Hondas, Soozooks, Aprillias, Yammys, ect...)
Or a torque rod back to the sprung frame ( like that one bicycle, I am trying to find the name of it.. A Santa Cruz maybe? ) ( and all racing motorcycles in the '80s and 90's).
This is " what motorcycles do".
When racing, you do not want your braking action to affect: interact with teh suspension of the vehicle: Ie jacking the suspension upon brake action. If your bicycle is never reaching 190mph on the curves,... you are not suicidal braking.. to the flick-in... this wont matter much... Plus, you are gong to jack the front suspension on any brake application on a two wheeled sprung vehicle..It is called " Brake Dive"... On a suspension-less Trike this matters... like... almost not at all. Negligible.
Where, around the rotor, this caliper is placed, has much less impact to the brake performance. A little.. but much much less.
Early disc brake calipers were in front of the fork leg on top of the disc. This placed the caliper in an area of high air flow for better heat removal. Calipers on most modern motorcycles are mounted to the rear of the fork leg. This reduces the angular momentum of the fork assembly and improves low speed handling
https://en.wikipedia.org/wiki/Motorcycle_braking_systems#Caliper_mounting
See the lug? See the rod? See how it works?
If you do not account for this action, anything you do downstream wont make a difference. ( where the tork moment acts on the assy on applications)( where the brake sits, making any sort of difference)... On a rear brake.
There is the reason they went to great lengths with the rear wheel control onthe motocycles. Jack. Jack and ...Bounce. Youdont want a wheel jacking, and or bouncing, upon a brake application.
Santa Cruz
https://www.santacruzbicycles.com/en-ZA/bike/v10/1
Santa Cruz " Bullit"
[youtube]mbLaTGfZMb0[/youtube]
Early CB 900F example
https://www.ebay.com/sch/i.html?_from=R40&_nkw=cb900+brake+rod&_sacat=0&LH_TitleDesc=0&rt=nc&LH_All=1
early CBR example
https://www.ebay.com/itm/123587487046?fits=Model%3ACBR1000F&epid=1126972497&hash=item1cc6636546%3Ag%3AuToAAOSwUVFcNipd&LH_ItemCondition=4
https://www.ebay.com/itm/193376439829?hash=item2d06224e15%3Ag%3Aot0AAOSw5eReZxDH&LH_ItemCondition=4
Early Kawasaki example (ZEDX9R) ( 20mm axle)
https://www.ebay.com/itm/203790993340?hash=item2f72e3c7bc:g:H5sAAOSwQuRh4QmO
https://www.ebay.com/itm/233479684281?_trkparms=ispr%3D1&hash=item365c7940b9:g
xEAAOSwX3FaH9hf&amdata=enc%3AAQAGAAACoPYe5NmHp%252B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsSRAQR8FABHjfpFoyRlXhWmeNhhmUVoFc6xn51yqE2iQCgFXHCO2JgLMPoiymERDnqPE0QwdiuA%252Bv5GiBdnLlQEaeF58N9v8VAiWq48PqKmv%252FFOKC3bO9kzqxm6A1iJvDTbvtoH6%252BKQkBjwBMhHzu1bn9j4boyiTRqN3wGNjYoPG4uG5s8N14cCqLd2jErOlJvSyqLzwivo84KNHlp6Hqg3AHXYB9NEVhD3dRZvTuFOEkASzSLwe9iz0UTWN%252BuXRPrFGUSLbRlf0jKjMj2u4lB5gVQC4491UOqbG7ps97V%252FkT0ufbDBhQ%252F71ymGCP7JaBDn5OKvSz5FzDmTzNIwMUaLELeaiV8FtNrU5AhyNnaaXy5XQvGTWiJUdwPBY7BdoIU6oSpr3Bgb9YsgxdC7%252BcPinWXpJkp8ANBUjaIHezmUbHS0awwDlIUO1oiTB9RqjVQvDTSvF4XvYZOSWNBoU1N6bfaIzUopll%252B%252FK9vZ9qPTnOlWpMmw4%252FwURDFhfSHacousPufE1vYMJCi5dpNtDmJEFGKHDv7pMn9YTKvQgF2LBZSOM0neSLQm7k4QGMgBWIsWu9jEbpuvtsjw%252BAUdsFPhiObk5KuXsflxjI1NOC%252FdeSv9VKqzqIRCvDV8LiMbtdXDrfEjr%252FaeGH%252Bo1RM1xg4huuEnyoCrdO0hgiydbHTxpa0AaG7i5cr2J8QLItsaashkr54ROzEuyoB5Q66wzeY3eI3ysafIH%252FJVvkzwT6BtBcvWShMyVyIQLVpUmlLm0A152y54O7uDd5WIGj7RKdlHoHqfoWlDaqmZL4tn4pHvQGf5oSOD9yM82UrMCMDajqf3MdSwnV%252B8Zh0R%252FU8qsRvDQ%253D%253D%7Cclp%3A2334524%7Ctkp%3ABFBMkK7A3fFf
Later Kaw example (ZEDX10R) (25mm axle)
https://www.ebay.com/itm/165238897126?hash=item26790179e6:g:xDAAAOSw3x9hvMMh
S1000RR example
https://www.ebay.com/itm/403355635518?hash=item5de9de8f3e:g:1o0AAOSwst1huRbY
Coincidentally, the Ducati racing motorcycles recently changed back to a rear brake Torque Rod.
https://motomatters.com/analysis/2019/01/11/exactly_what_does_ducati_s_torque_arm_do.html
The arm works in tension, not compression. When the caliper squeezes the disk most of the momentum is translated to a linear force.