- 220SE was a 7.50x13
- Fintails, /8 and Mercedes from that era used 185HR14 radials which is no longer available, the closest equivalent is 185/80R14.
These are difficult to find at best and people use 195/75R14 or 205/70R14 - but with 205's you need 6.5" rims, not 6" rims. An even closer match is 215/70R14 - that's within 0.07% of the original size. See this chart.
As far as rolling diameter is concerned if you talk to any suspension guy who knows his stuff he will tell you
how each tyre has its ideal rim width. Not surprisingly the MB engineers
also have a fair idea about the relationship between tyre width and rim
width.
W115 240D 5.5 inch rim with 175 tyre
W116 280SE 6inch rim with 185 tyre
W116 450SE 6.5 inch rim with 205 tyre
Etc, etc.
A 215 tyre would need a 7 inch rim to perform optimally.
- 124: 195/65 r 15 rim is 6 1/2 x 15 offset 49mm
- 126: 15X6.5 5-112 lug pattern, 21.5mm offset part # of alloys is 1264004102
- 280S - 6J x 14 H2 Wheel offset 30 - 195/70 R14
- 280SE/L - 6J x 14 H2 Wheel offset 30 - 195/70 VR14
- 380SE/C/L, 500SE/C/L, 560SE/C/L, - 6-1/2J x 14 H2 wheel offset 30 - 205/70 VR14
- 205/60-15 (late)
Bias ply tires:
These classic Mercedes-Benz models originally used bias-ply (crossply) tires in 7.25-13 or 7.35-14 sizes, depending on the chassis generation and trim.
The specific size breakdowns vary by model:
220 / 220SE (W111 Fintail): Originally used 7.25-13 bias-ply tires on 13-inch wheels.
250SE (W108 / W111): Originally used 7.35-14 bias-ply tires on 14-inch wheels.
280SE (W108 / W111): Early models commonly used 7.35-14 bias-ply tires.