2.5J 是2.5英吋 J 是代表框的形狀 不是一個值
有興趣可以參考下面連結
https://www.oponeo.co.uk/tyre-article/how-to-read-the-wheel-markings
The letter - “J” in the case of the above example - is the symbol used to define the wheel collar profile. There are various types of wheel edges, listed as follows:
Symbol Use
A -> Bicycles, mopeds, motorcycles, scooters, vans, lorries, forklifts
B -> Old wheels up to 6" wide, sometimes found on the old VW Beetle
D -> Bicycles, mopeds, motorcycles, scooters, vans, lorries, forklifts
E -> Lorries, vans, tractors (front wheel drive) with "semi-drop" wheels (see below)
F -> Vans, lorries, forklifts with "semi-drop" wheels
G, H -> Vans, lorries with "semi-drop" wheels
J -> Passenger cars
JJ -> 4x4 SUVs
P, K -> Found sometimes in older cars such as VW Beetle, Jaguar
S -> Commercial vehicles with "flatbase" wheels (see below)
T, V -> Commercial vehicles with "flatbase" wheels
W -> Agricultural tractors, mainly on the rear axle
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