Hi new to the site but was hoping you can help i have a car i race which runs mainly ford running gear im looking to upgrade the brakes but unsure what to use, the front end runs on sierra hubs (vented) with 13" xr2i alloys and the rear is disc converted mk1/mk2 escort rear axel again using 13" wheels with fiesta disks and fiesta mk2 calipers any help is appriciated

 

You need to measure your inside wheel clearance, then that will tell you the biggest disc size you can get in there with seperate bells etc being made a one off.
Someone like HI SPEC can do a one off kit for you.
The problem is the 13" wheels.
tabetha