"backer rod" for 1/25 semi tires?

[old fogey]

What size "backer rod" for 1/25 semi tires?

[NOBLNG]

Hi James. Check out the sticky post above: “How do I search…”.  That said, I did a search since I am thinking of building a big rig soon too. i came up with 3/8” and apparently you can trim it quite easily if it is a tad too big.

Edited 10 hours ago by NOBLNG

[Rbray47]

I use paper towels. Split a towel width wise and twist it into a rope. 

Works well enough. These logs are heavy, but they're keeping a bead.

[peteski]

14 hours ago, old fogey said:

What size "backer rod" for 1/25 semi tires?

No all big rig model tires are the same size. You might have to get few sizes (they are not very expensive) and experiment yourself.  Here is some additional related info: