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Old 12-16-2018, 01:14 PM   #1
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Thoughts on replacing 15" tire with 16"

After hearing the stories from my father-in-law about China bomb tires and reading FR forums, I have an opportunity to replace my 2018 Vibe stock ST 225/75R15 tires with LT 225/75R16 (Cooper Discoverer HT3) tires. The Cooper tires are what my father-in-law, a long time travel trailer enthusiast, now has on his trailer and went from a 15" to current 16". Anyone see a problem with me doing the same? Appreciate the feedback.
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Old 12-16-2018, 07:56 PM   #2
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I just checked clearance on my 268rks and that would be the only concern that I can see. There is not much clearance and may prove to be problematic when changing a tire away from a tire shop.
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Old 12-16-2018, 08:42 PM   #3
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moving from 15 to 16 means also replacing the rims and maybe not having enough trailer clearance, causing the tires to rub the underside of the trailer or even not enough clearance between the two rotating tires.

It might make more sense to find out the load range of you ST (special trailer tire like a load range D) and increase a load range ( from D to E, etc) of the same size tire... this gives you an extra loading margin
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Old 12-17-2018, 10:47 PM   #4
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@hshaynes & @rsdata, thanks for the tips - I will definitely keep in mind potential clearance issue and rating suggestion. So far the stock tires are doing fine, just hate the thought of a tire failing, especially a result of one of these China bomb's I've been reading about - I would rather be as pro-active as possible and a set of the 16" wheel/tires is available, and I was hoping the 16" set would ease my mind. Thanks again - much appreciated.
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Old 12-17-2018, 11:11 PM   #5
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Not all tires manufactured in Asia are alike. What brand are they?

Personally, I would not use LT tires, and they might be hard to find in a 15" size. The most popular 15" ST tires here currently seem to be Goodyear Endurance and Maxxis M8008. There are more options if 16" will fit but IMO that would be a waste of money when there a good 15" ST tires available. If you replace the tires, go one load range higher than the stock tires.
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Old 12-18-2018, 06:03 AM   #6
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Brakes

In addition to new rims, you might also need to install bigger brakes to compensate for the larger tires. Personally, I'd stay with the 15" tires as originally designed.
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Old 12-18-2018, 11:46 PM   #7
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Get your father in law to pay the bill and go for it. Any tire problem i have ever had was due to a piece of angle iron on someone's lost mud flap. Im happy with my trailer king tires, swap them out every 5 years and run tpms.
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Old 12-19-2018, 09:08 AM   #8
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Quote:
Originally Posted by danking49 View Post
In addition to new rims, you might also need to install bigger brakes to compensate for the larger tires. Personally, I'd stay with the 15" tires as originally designed.
Curious. Why would you need bigger brakes for larger tires? Brake systems are sized for the load to stip, not tire size
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Old 12-19-2018, 10:17 AM   #9
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Brakes would only need to be changed if swapping out the axles to a heavier load rating, and the new axles would most likely come with them already mounted.
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Old 12-19-2018, 05:19 PM   #10
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Lot of manufacturers recommend larger brakes when installing larger tires.
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Old 12-19-2018, 05:24 PM   #11
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I did it...very happy!

I had 2 blowouts of my 15" ST225 tires on 2 different trips...2 months apart. The tires were only 3 years old. Someone who thinks that ST tires need to be replaced every 3 years - wow...based on?? LTs - 6 to 10 year life minimum!

After that - I got 16" rims and went with LT tires. Advantage is a get a tire that has better ratings (and about a 20% increase in weight handling) - at the same price as the ST's. I carefully researched the relative size differences in the overall tire - and verified I had the room on my 5th Wheel toyhauler - and decided to go with the swap.

I recouped some of the cost of the rims (purchased off eBay) by selling the 15" rims. Since then - no problems.

Interesting side note - the ST trailer tires have a 65 mph rating....while the LT tires are rated (IIRC) - at about 88 mph. Not that I go fast - but I think the LT is a better tire overall....and for about the same price - it is a 'no-brainer'.
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