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Old 06-01-2016, 12:21 PM   #1
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WHEEL CUT and TURNING RADIUS

What are the various wheel cuts (in degrees) and what would their turning radius be.

Thanks .....
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Old 06-01-2016, 12:27 PM   #2
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Wheel cut is dependent on the chassis builder, and for your Tiffin, you can check the
Freightliner Custom Chassis website for specs.

Turning radius is dependent on your wheel cut and your wheelbase. Short wheelbases will turn in a tighter radius than longer ones. Seems like there should be a simple formula to calculate this and maybe someone has developed one.
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Old 06-01-2016, 01:57 PM   #3
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I think there are as many answers to that question as there are coaches out there. We're fairly new to motor homes, but turning radius hasn't been much of an issue for us.
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Old 06-01-2016, 02:12 PM   #4
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I have almost 60 degree on my '09 coach. I don't recall radius off hand, but went to a large parking lot one day to measure several turn figures in planning for my rv garage and approach pad connecting to my barn. I'd think the salesman or manufacturer would have the data you seek.
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Old 06-01-2016, 04:34 PM   #5
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As alluded to above, turning radius is affected more by the wheel base. Newer chassis have a 55 degree or even 60 degree wheel cut which helps when maneuvering in tight quarters. A greater wheel cut will also increase your tail swing. You are still going to have to watch both ends.
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Old 06-01-2016, 05:41 PM   #6
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According the specs for my 40' non-tag 2000 Country Coach Magna with 55 degree wheel cut and 227" wheel base, the curb to curb turning diameter is 72' 3-3/4".
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Old 06-02-2016, 09:39 AM   #7
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Another complicating factor, you can't rely on the chassis manufacturer specs to determine wheel cut.

I think both Freightliner and Spartan advertise "up to a" 60 degree wheel cut but this can be limited by the coach manufacturers choice of wheels and/or body design. As example, when comparing the 2016 Newmar specs for our London Aire the Freightliner was limited to a 52 degree cut, the Spartan to 55 degrees.
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Old 06-02-2016, 12:53 PM   #8
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Here's the Workhorse steering angle or wheel cut.

"The steering angle or wheel cut on the 7,500 lb. and 8,000 lb. front axles is 45
degrees, on all chassis built to August 28, 2002. The optional 8,500 lb.
front axle and all W Series chassis built after August 28, 2002 will have a
wheel cut angle of 47 degrees. Starting January 6, 2004 all W Series chassis
wheel cut increased to 50 degrees."

I have found that the 50 wheel cut comes in very handy in tight areas, but watch the rear overhang on gas coaches.
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Old 06-02-2016, 07:05 PM   #9
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My turning wheel cut is 60 degrees and there is a sticker that states turning radius is 81'...45' with a tag, Freightliner Chassis.
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Old 06-02-2016, 07:15 PM   #10
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Quote:
Originally Posted by luvlabs View Post
Seems like there should be a simple formula to calculate this and maybe someone has developed one.
When I was doing design work for the WA DOT we had books with the turning radius of various rigs that we used to design intersections. It's been some 25 years or so since I did that work and I don't remember what books they were.
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Old 06-02-2016, 08:46 PM   #11
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Here's a page I found for calculation turning radius.

http://tinyurl.com/jyu32xc

Enjoy
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Old 06-03-2016, 01:10 AM   #12
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Quote:
Originally Posted by phays View Post
According the specs for my 40' non-tag 2000 Country Coach Magna with 55 degree wheel cut and 227" wheel base, the curb to curb turning diameter is 72' 3-3/4".
From our 2009 Magna owners manual:
Turning diameter: Calculated @ outside edge of outside wheel
40' MH 60'-3"
42' MH 65'
45' MH 70'-3 our rig has a 289" wheelbase and 58 wheel cut even with the 365/70 tires.

No wonder I can put this thing into the same spots as our 40' Dutch Star even though it's longer
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