Alright girl, you have a crush on Akemi. But these two don't, so why are you so obsessed with competing with them? Akemi’s personal opinion is a different story, but I don’t think her best friend or rival is barrier for you.
@Torappu a 540/65R30 agricultural tire (weights about 240 pounds) will cost about that much used. The one used in this is even larger.
Tire that size are expensive because of profit margins. Car tires are cheap because they're relatively standardized, so they can produce a lot compared to what they cost to R&D. When you get into non-standard sizes, such as high-spec racing tires, or heavy machinery/agricultural tires, they cost a lot more because the production is smaller. It might cost 300$ of rubber, but you have the R&D to pay for too. And unlike car tires, you might change your tractor tires maybe 2 or 3 times in its lifetime if they don't spend time on the road.
The sister schools mentioned by Zina's "soeur system, sounds sweet" followed by Hibiki's "sounds septic" is just fantastic wordplay. Like, seriously, that joke's on point. I love it.