In the October 21, 2020 interview with Music is Win, Tim explained that he uses 10-52 gauge strings. Unfortunately, he does not specify the model or the make – but based on the fact that his signature Ibanez THBB10 comes equipped with D’Addario EXL110, it’s very possible that Tim is using D’Addarios well.
If so, the D’Addario EXL140 is a likely candidate, and it features the following gauges: .010, .013 .017, .030, .042, .052.
Other than that, he could also be using Ernie Ball’s Skinny Top Heavy Bottom set which has the exact same gauges as the D’Addario set.
Since then he has released a video with Ernie Ball String Theory Series. This has confirmed his affiliation with Ernie Ball Skinny Top Heavy Bottom 10-52 strings