165 R15 is the standard VW Beetle size radial tire. These days the equivalent is 165 80R/15. That’s more tire than an original TD. I have them on my Duchess on stock VW wheels, simply beucase I wanted something close to the original look. My car is in the gallery under PMOSSBERG.
With the 165s, there is a lot of clearance on my Duchess. Based on that, my guess is the wider tires would fit with no problem in the rear. You might have some rub at full left/right in the front. As these cars are all hand built, there can be some variation in the exact position of the fenders. So it’s hard to say for certain if you will have clearance issues or not.
Former Owner of a 1981 Classic Roadsters Ltd. Duchess (VW)
2005 Intermeccanica Roadster
If you own a TDr and are not in the Registry, please go to https://tdreplica.com/forums/topic/mg-td-replica-registry/ and register (you need to copy and paste the link)