TR13-TR15 Plastic Valve Hole Spacer
This plastic collar or ferrule or sleeve converts a standard 11.5mm TR13 valve stem
diameter into the next size up 16mm diameter TR15 valve stem. This is
for when the hole in the wheel rim needs the larger diameter stem size.
This larger 16mm hole (the actual size was 0.635 inches) was common on the wheels of
many vehicles in the earlier post war period on cars such as Mk.6 Bentley, XK Jaguars, Austin-Healey and a huge variety of other cars, although today they are known more for Land Rover and Range Rovers. Many German
cars were also fitted with larger valve stem size such as BMW 503 and 507, and no doubt many others.
We have also come across wheels that have been drilled out subsequently,
no doubt where a larger stem tube must have been used in the wheel at some stage
in its life! One day we should try and compile an exhaustive list of
cars that used the larger TR15 stem size from new. . . .
Note that if you are using a metal stem TR11 you do not require this collar, because the external nut centralises the stem into the larger hole automatically. This collar is only for use to slide over the standard rubber TR13 valve stem.
