CA-R1 modern spare kit size compatibility

[YunFatChow]

The modern spare is 155/85R18, while my stock size is 225/60R18. I've got a full-size spare for my CA-R1, but it's taking up a ton of space. I'm thinking about getting the modern spare kit, but I'm not sure about the size compatibility.

Does anyone know if the modern spare kit will work with my CA-R1, or if I'll need to buy a new tire as well? The price seems a bit steep if I have to do both.

 

[Garci.20]

The 155/85R18 tire will fit, but keep in mind that it is only intended to be used as a spare.