Will Tie Down Spare Tire Mount Hardware Fit a 4" Thick Trailer Frame?

Updated 09/12/2025 | Published 08/27/2025

Question:

My Shorelander boat trailer frame is 6 inches tall and 4 inches thick. Im a little concerned the bolts wont quite be long enough.

asked by: Steve W

Expert Reply:

Hey Steve!

The bolts that come with the Tie Down Spare Tire Mount # TD86FR are 1/2”-13 x 4-1/2” so you'll definitely be pushing the limits with a 4" wide frame. The nice thing is that you can easily find longer bolts at your local hardware or home improvement store.

Most spare tire mounts are designed for trailer frames that are up to 3" wide, so you'll have to get replacement hardware for basically any spare tire kit you end up going with.

Do you already have the spare tire as well?

expert reply by: Jon G

Jon G.

9/12/2025

Hey Steve, Did you manage to find longer bolts for your trailer frame? I'm curious to know how it worked out for you, as it could help others with similar trailer setups.