[![Hole in Carbon Rim](https://i.stack.imgur.com/bzXBh.jpg)](https://i.stack.imgur.com/bzXBh.jpg)I discovered a gaping hole about 1" x 3/8" in my carbon fiber rear rim, at a spoke.
The rim is a Fulcrum S-19 Racing (22.5x622x28), that I ride on about 100 miles a week,
so I imagine this rim is kaput.

The rims are about 4 years old and came on the Specialized Tarmac 2017 when I bought the bike.
Right now I am using the bike for just regular road cycling, no racing, so I don't need the bike to be light and have carbon fiber.

#1 Are there any issues with switching both front and rear rims out for less expensive alloy rims?

#2 Can you just switch out one rim, the rear, and it change to alloy, and leave the other, the front rim, carbon fiber?

#3 Just to verify- the damaged rim is unfit for further use?

#4 Any point in installing the used rear cassette on a new alloy rim?

Thanks for any feedback - Street Roller