i have an 89 bronco with no rear tire rack on the back....i was wondering if anyone knows a place to get roof racks...i would like to mount my spare tire on top....what is the biggest tire you can fit in the tire rack that most broncos have
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If your Bronco is not equipped with a factory external spare tire rack, you are limited on the size you can mount to the internal one on the passngr-side rear wheelwell to a 32x11.50 (some 33x12.50's may also fit). I have seen some Broncos with a roof rack by CONN-FERR that mounts to the hardtop, and you can secure a larger spare tire up there. The problem is that a 35" or larger tire and rim can weigh 80-100 lbs., and you need some muscle to lift them up or pull them off of the top of your Bronco.
The external mount has supports inside the right rear quarter panel to handle the stress of the spare tire and rim, so you should not merely bolt up a rack to the panel if it is not made to handle one. I also have seen a 35" or 36" tire mounted to the stock mount, but have also seen many of those do some serious damage to the panel when offroading.
My solution with my 35's was to totally remove the external mount, and bolt my spare tire to the floor to the rear bench seat anchor in the middle. If you want to keep the rear seat, look into an aftermarket, bumper-mounted spare tire carrier. You not only get a heavy-duty rear bumper, but also get a good mounting system for your spare tire.