In my Overhaul Class, I like to give students a mechanical model for what happens when you mismatch brakes and levers. I usually draw something like the diagram below and talk about the trade-offs.
~matt
On Tue, Mar 13, 2018 at 4:14 PM, cyclista@inventati.org wrote:
We exclusively teach the third above method, i.e. distance between stop and pivot. It goes over pretty much instantly. The thornier part is to get participants to remember which caliper/arm type each lever goes with.
cyclista Nicholas
On 2018-03-09 21:36, Ron Kellis wrote:
Thank you!. Shaking my head over why the Park article didn't come up in my search. Limitations of the Google most popular link type search and a true vertical search.
Appreciate the details!
Ron
On Fri, Mar 9, 2018 at 8:02 AM, David Oliver nowhere3@gmail.com wrote:
There are three ways that I teach people how to identify the difference.
First is the obvious one that if it says V-Brake on the brake, it's long pull.
Second is that if you look at most flat bar brake levers there are two holes, or at least an indent where a second hole could be, where the part that the head of the cable can go into is (the silver bit in this photo: https://www.parktool.com/assets/img/repairhelp/housingU_005.jpg). If it's in the top hole, then it's long pull. If it's in the bottom hole then it's short pull. There are sometimes a little "C" and a little "V" next to those holes/indent that make it even easier.
If that second one doesn't make sense, I can get a photo later today and send it to you.
Third is by measuring the distance from the pivot point to where the head of the cable goes. Park Tool says that it is 21mm for short pull: https://www.parktool.com/assets/img/repairhelp/ta-flatbar-conv.jpg and 42mm for long pull: https://www.parktool.com/assets/img/repairhelp/ta- linearpull.jpg
In practice for the third method I tell people to measure with a ruler the distance and if it's less than 30mm then it's short pull, if it's more than 35mm then it's long pull and if it's hard to tell or somewhere inbetween then it's hard to tell without testing it.
On Fri, Mar 9, 2018 at 7:25 AM, Ron Kellis ron.kellis@velocitycoop.org wrote:
Salvaged brake handles are rarely kept with the calipers. Anyone have a
reasonably reliable method for identifying long pull https://maps.google.com/?q=y+reliable+method+for+identifying+long+pull&entry=gmail&source=g vs. short pull handles?
TIA
Ron
-- Ron Kellis | Véloteer & Basic Maintenance Instructor | VéloCity Bicycle Co-op | 2111 Mt. Vernon Ave., Alexandria, VA 22301 https://maps.google.com/?q=2111+Mt.+Vernon+Ave.,+Alexandria ,+VA+%C2%A022301&entry=gmail&source=g | velocitycoop.org | +1 (703) 549-1108
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