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08-31-2021, 04:46 AM | #1 |
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Max Tyre Size for M47 Pickup 16" Rim
Hi Folks,
I am wanting to reduce engine RPM, when cruising the highway, by increasing rear tire size on a standard 16" rim on our Mercury M47. Currently running 215/70/16 with 3 speed box and Dana 41 rear end. Any experienced suggestions? Thanks. |
08-31-2021, 07:12 AM | #2 |
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Re: Max Tyre Size for M47 Pickup 16" Rim
235/85R16 Land Rover size.
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08-31-2021, 01:20 PM | #3 |
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Re: Max Tyre Size for M47 Pickup 16" Rim
I run 215 x 85 x 16's on my F350. They are 30.39" tall.
Your 215 x 70 x16, should be 27.85". The 85's should give a extra 2.5+". If your rim width will except the 235's width, you'd have a tire 31.73 tall, a extra 3.88". How wide are your rims? Edit: If you go with the 215 x 85, it will increase your speed from 60 mph, to 65 at the same rpm, the 235 x 85 would be 68 mph.
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Frank '35 Ford Model 51 '48 Ford F3 '54 Ford Tudor Mainline Last edited by frnkeore; 08-31-2021 at 01:25 PM. |
08-31-2021, 05:31 PM | #4 |
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Re: Max Tyre Size for M47 Pickup 16" Rim
A 235/85R16” has a minimum rim width standard of 6.00”. These would be appropriate only if you have non-stock wider rims. If you have stock 4.50” rims even your current 215/70R16s are over spec. Stu
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Stu McMillan Marmon-Herringtons |
08-31-2021, 11:40 PM | #5 |
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Re: Max Tyre Size for M47 Pickup 16" Rim
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09-03-2021, 11:11 AM | #6 |
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Re: Max Tyre Size for M47 Pickup 16" Rim
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09-03-2021, 11:55 AM | #7 |
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Re: Max Tyre Size for M47 Pickup 16" Rim
I put my name at the bottom of every posting I make, both here and on FTE. I have a reputation and try to give factual info supported by references. When correct tire sizes exist I think it wise to stay within Tire and Rim Association standards. In this person’s case I would stay with stock 6.50-16” tires.
I try to avoid the debate over bias vs radial tires on cars and small trucks. Our old riveted rims were never intended for radials, but I’ve not found an authoritative reference that documents harm due to their use. This is not the case on big truck tubeless sizes used commercially. I have an SAE study showing rim failures due to radial usage on early riveted tubeless wheels. Stu
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Stu McMillan Marmon-Herringtons |
09-03-2021, 02:40 PM | #8 |
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Re: Max Tyre Size for M47 Pickup 16" Rim
I'm not critical of anything Stu writes. I was impressed that someone other than I notices that there is a standard. There are so many ignored engineering and safety standards in the old car hobby, that it invites unwanted regulation as we got with emissions, and safety industries. Good Luck: Fred A
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09-04-2021, 03:35 AM | #9 | |
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Re: Max Tyre Size for M47 Pickup 16" Rim
Quote:
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