What GIBrat51 said. ^ On the 65-115 set of Roto tapes, the nylon adds @ 15 thou to the diameter of the string, but because it is plastic, adds negligible mass and therefore no tension to the strings. So the set is actually comparable to a 50-100 set of conventional round wound strings. I will say that I do not like the G string, as to me it is noticably tighter than the rest of the set, so the bass I had a set of these on I changed out the G string for a La Bella 60 black tape. I do like the short scale set better than the long scale set because the A string on the short scale set is a 90, where on the long scale set it is a 100. Why Roto doesn't "normalize" the set and put a 60 as the G string and a 95 as the A string on all the sets I will never know. That is what La Bella and D'Addario do: same "standard" gauges on both the black and white tapes for all four scale lengths: short, medium, long, x-long.
To expand on what GIBrat51 says: the Roto tapes are designed to emulate a double bass tone. That could be one reason that they work well on Hofner and similar basses. But...that bridge does float so you do have to make sure it is properly set before final tuning the strings to pitch. Listen again to Sir Macca's bass lines, and they go sharp up the neck because the bridge is not in the correct place generally. I do concur once you get the floating bridge to the right place they intonate well.