I should also point out that the capital gains on the sale of collectibles is taxed differently than other capital gains. Gains on the sale of collectibles is taxed as ordinary income with a cap of 28%, and does not benefit from the 0%, 15% and 20% rates for other capital gains.
https://www.gtreilly.com/blog/article/selling-that-original-warhol-prepare-for-tax-bite-on-your-coll...
"Collectibles" includes a list of specified items, plus "anything else designated by the IRS as a collectible." If audited, the IRS might decide the motorcycle was a collectible instead of an investment. One factor is how you treat the property. If your intention is to sell it immediately, then it might be treated as an investment by you, even though it was a a collectible to your grandmother. As an investment to you, it would be taxed at the lower long term capital gain rate.
However, this is something you will want to be aware of, and include in your documentation. Keep paperwork related to the inheritance, appraisal and sale of the motorcycle with your other important papers for at least 6 years, in case of audit.
