Size and brand are the item
A tyre is identified by its size code and its brand, and both belong on the item rather than in a note — that is what a customer asks for, what your supplier orders by, and what a warranty claim is matched against. Treating tyres generically makes stock meaningless in a trade where the whole question is whether you have that size today.
Fitting, balancing and alignment
The tyre carries a thin margin set largely by the printed price; the work around it does not. Charging fitting, balancing, alignment and valve separately keeps your tyre price comparable to the shop down the road while making the service visible — and it lets you see monthly whether the workshop side is actually earning what you assume it is.
Warranty and the return months later
Tyre warranties run for years and claims arrive without paperwork. Recording the brand, size and serial on the invoice means you find it by party or item in seconds and deal with the manufacturer properly. Shops that cannot find the bill absorb the replacement, and on a set of truck tyres that is a serious amount.
Fleet and transporter accounts
A transporter or a fleet operator buys repeatedly across several vehicles and settles monthly, which is a running account rather than a counter sale. Recording the vehicle number against each sale means the account can be read vehicle by vehicle, which is exactly what the operator asks for before he pays — and it makes your statement something he can check rather than argue with.