I found out that my 81X rear tire mysteriously developped a leak while sitting in the winter. As it is rather low on treads, I decided to replace it. It is a 130/80-18 BT45.
The BT45 also comes in a 140/80-18 and a 140/70-18. The application list recommends a 4" rim for 140/70.(
) Has anybody used the 140/70 on the rear of a Prolink? (wheel is only 2.75")