I took the speedo from my VT5 to a local speedo shop to get a cable. The small cables are not available. But, an elderly man, who probably owns the place, crapped all over the german speedo and said if I wanted something reliable to get an American made one. He said he had them complete for about $80. I only wanted a cable so I didn't pursue it. If you think you are interested, I can go back over and get more info. I believe that his package would be correct for whatever tire size you would specify. I'd guess he has at least a 100 years experience. In the early 90's I built a 1950 Olds for a man in New York to run in the LaCarrera Panamerica and this shop did a great job on the speedo for me.