What Info is Needed to Install Drop Axle on Trailer

Updated 02/17/2026 | Published 06/10/2024

Question:

I have a boat trailer with 185 80 r13 tires on it can I switch to a drop axle to lower the trailer without causing a problem with the shackle bolts being too low to the ground

asked by: David R

Expert Reply:

Hey David, there's a pretty good chance you could but it really comes down to by how much lower the drop axle is to determine if you have fender clearance. Generally you want to have at least 3 inches of fender clearance. So you'd need that as a minimum unless you'd be willing to raise the fenders up.

To pick out an axle you'd need to know the capacity you need, distance between spring centers, and then distance from hub face to hub face.

expert reply by: Jameson C

Jameson C.

2/17/2026

Hey David, how did things turn out with the drop axle on your boat trailer? Did you end up with enough fender clearance after checking those measurements? Your update could make it easier for the next person looking to lower their trailer safely.