1950 Thunderbird, larger rear tyre?

[alm]

Any suggestions?

 

[NM Bonny]

1950 T6 Thunderbird, I would like to pot a larger tire on the rear, any suggestions?

What is the stock size for your bike? Also, can you take a measurement between your swing arms where the widest part of the existing tire passes between?

I have fitted tires in the stock size for my bike—in the rear, 4.00-18”—but the Bridgestone Battlax in that size is wider than the OEM brand, which was on the bike when I bought it. So, merely fitting the Battlax in the stock size netted a wider tire (up front, too). Here are photos of the clearance on my bike—first three are rear, last two are front...

I did not have to modify anything—but can compare my swing arm to yours if you provide measurements.

 

[Rudie]

stock size for your bike?

Also if the bike is fitted with stock rear fender/mudguard.

 

[Rudie]

stock size for my bike—in the rear, 4.00-18”
can compare my swing arm to yours if you provide measurements.

Original 50 Thunderbird has a rigid frame:-

Stock tyre sizes are curiously difficult to find? However, the (original) rear rim was 19" and WM2 width; as even Triumph fitted OE 4.00 tyres on WM3 rims, I suspect a 50 twin's original rear tyre was 3.50?