Originally Posted by
MitchC
In my case, I'm looking at making a plate out of flat aluminum I can weld to the 1" square tube frame. I'm a bit rusty from my mechanical drawing days. Getting back into it for this project so please forgive me if I'm not understanding. I'm not sure if I will build from seat stay or chain stay reference, but ideally I will be able to accommodate my frame above or below the axel and caliper (1" / 25mm square tube).
When I'm looking at your Seat Stay drawing I interpret the drawing this way:
- Middle drawing, I need 7-8mm flat material. Easy peasy.
- Angle "I" seems to be missing (and important) as is dimension E...
- Are these measurements for 160mm or 180mm rotors?
Can anyone help me fill in the blanks?
Thanks in advance 😃
These dimensions are for an IS (international standard) mount, which no one make a direct mounting brake to fit. You must use an IS to Post Mount adapter and they are made to adapt from 140mm to 200mm rotors using the same IS mount on the frame.
Dimension E is for clearance for the brake caliper and is dependant on the caliper used. The specs call for anywhere from 3.5mm to 6.5mm depending on the caliper. More clearance is better and is not going to affect the performance of the brake.
Dimension I is the max. angle for the mount I have never paid any attention to it. The specs call for a max. of 201 degrees, but anything with a tighter angle than that would't really function as a seat stay very well.
The mount does not have to be 7-8mm thick. Most of the comercially made mounts are 5mm thick.