Boatmate trailer tire sizes

[j.mo]

So the new boatmate’s are coming with 255/55r18 nexen tires.

My tires that came on my ‘13 are 255/45r18

I’d like to put the larger size on for more carrying capacity, and ironically they actually cost less.

I did call boat mate and verify if they would fit, the gentleman said yes, but he didn’t sound too confident and I’ve been given wrong information before in my lifetime.
So I figured I’d ask some of the folks here just to double check before I order a set of tires.


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[arsnlgunnr]

The “45” and “55” number is the tire profile or height of the sidewall. Basically the smaller number are low profile and higher numbers would be a “thicker” profile tire. The 255 number is the tires width.

Unless there is a clearance issue with the fender for the “thicker” 55 tire, pretty sure you’ll be good.

https://www.discounttire.com/learn/tire-size-calculator


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[larry_arizona]

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[larry_arizona]

Just a quick reminder explanation.

255/55/18 equals 255mm treadwidth, 55% of treadwidth is sidewall height and 18” rim.

Always funny that they mixed metric and standard dimensions for calling out tires.


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[j.mo]

The “45” and “55” number is the tire profile or height of the sidewall. Basically the smaller number are low profile and higher numbers would be a “thicker” profile tire. The 255 number is the tires width.

Unless there is a clearance issue with the fender for the “thicker” 55 tire, pretty sure you’ll be good.

https://www.discounttire.com/learn/tire-size-calculator


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I know. like Larry shows it’s an inch wider and 2 inches larger.
I was just looking for reference of those who have them and if there were possibly any changes made from boatmate in the dimensions of the fenders during the transition


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[larry_arizona]

They are the same width at 255mm or 10”.

The sidewall is 1” taller x 2 = 2” taller tire.


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[sandm]

I've been researching this same topic for my chevy as it's ready for new shoes. tire sizing, although simple math, sure does pose a lot of questions and mis-information on what will and won't fit.

[larry_arizona]

I've been researching this same topic for my chevy as it's ready for new shoes. tire sizing, although simple math, sure does pose a lot of questions and mis-information on what will and won't fit.

If you stay with stock size and fitment code it’s easy.

If you are upsizing,it gets more complicated.

I hate upsizing stock truck tires as it kills rear end gear ratio.


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[j.mo]

I just went out and measured my trailer. From the tire to fender there is just about 1 1/2”
By adding an inch to that up top, it just may barely clear

I was hoping by this thread to get more than Theory lol


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[sandm]

our issue is the mead launch ramps are soooo shallow that to float the boat off, we have the rear fender and a good 6" of the bed rear corner underwater. I'd be doing the exact opposite of the OP looking for the lowest tire we can put on.

I've toyed around with doing a 2" lift as they don't seem to wreak much havoc on the truck and then upsizing the tire a tad.
for reference, 2016 chevy 1500 excab 4x4 z71. I have a gas app that I track economy on it and my bike. since thanksgiving 2019(ya 14 months ago) I have only put 2450 miles on it so we don't drive it much.

to the op- are you pushing capacity on those 18's? we had the 45 series on our last tige z3 and had no issues with boat, gear fuel and a grand in lead. it was BARELY within specs but was "legal". not much else we would have needed to haul and no issues loading up 6 people to back down the ramp.