I can understand why Amazon would have strict thresholds on this content, as it seems like an easy target for abuse.

If I'm reading you correctly, you were a bike enthusiast who made a helpful website for decoding tire SKUs. Does the affiliate program give you commissions on items that sell through your account webpage? Were you selling tires / an Amazon affiliate before?

It just seems like an odd thing to monetize, but I admire your entrepreneurial spirit!