The dictionary definitions of the word barter are....To trade goods or services without the exchange of money.v.tr. Online dictionary
to trade by exchanging one commodity for another ....Websters
exchange (goods or services) for other goods or services without using money: Oxford
Exchanging silver is not bartering unless I have the silver to exchange. In this case I'd have to purchase the silver to make the transaction which immediately contradicts the concept of bartering. I think my TS90, throttle, grips and handlebars swap for the shocks is more in keeping with the true definition of bartering.