185/80D13 tyres

maori-boy, Dec 10, 7:33am
my boat trailer has these on them does any1 know where i can get them.
I've never heard of them before

panelvanner, Dec 10, 7:35am
Sounds like space saver spare, tyres.

panelvanner, Dec 10, 7:40am
"D" being diagonal ply construction, more likely than the D Speed rating, of 40mph.

vr4_legnum, Dec 10, 7:43am
Just replace them with a 165R13 light truck 8 ply tyres or 175R13 light truck 8 ply tyres, 185R13(or 185/80x13 if you can find them) won't be cheap, You should be able to find good pair of used 165R13 light trucks tyres

The D look like it means it a bias tyre.( Don't know if I'm right or not)

scuba, Dec 10, 8:37am
pretty sure Hankook supply a 185 13 light truck tyre

mm12345, Dec 10, 8:52am
I'm with VR4 above.If 165/13 LT 8 ply are cheap/easily available, use them, but don't cheap out on a 6 ply.Run them at high pressure (probably 45-55PSI, depending on load).OP will need to have matching tyre sizes (ie on opposing "axles" if it's a tandem trailer).
The OP's tyre is a bias tyre designed for trailers.Possibly better, but probably expensive or as rare as rockinghorse faeces in NZ.