The XR4Ti was built by Merkur.
XR4Ti answers
When did Merkur stop making the XR4Ti?
Merkur stopped production on the XR4Ti in the 1989 model year. Merkur produced the XR4Ti for 4 years.
What years did Merkur make the XR4Ti?
The Merkur XR4Ti was produced from 1985 to 1989.