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Old 05-23-2007, 11:33 AM   #1
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True Turning Radius Measurements

One of several reasons people list to go with the Sportsmobile 4x4 conversion instead of the Quigley conversion is the greatly improved turning radius. However, I'm having trouble finding out what these actually are. My questions/impressions are for a Ford RB van.

It appears that the Quigley 4x4 turning radius is 56'.

I've heard two different numbers for the Sportsmobile turning radius: 39' and 49'. There is obviously a large difference between the two.

Does anyone know which SMB number is correct? Also, if it is 49', then there is a difference between the SMB and Quigley, but not as dynamic as I've been led to believe. Does the 7' really make that much of a difference?
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Old 05-23-2007, 05:49 PM   #2
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I do not actually have a measurement, but I did test drive one and Jonathan told me that it was 39' for the SMB conversion. I now have a quigley and really wish I would have gotten the smb just for the tighter turning.
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Old 05-23-2007, 06:54 PM   #3
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SMB used to list 39' curb to curb on their web site. I spent a lot of time with them as they weren't able to get that in real life. The 39' was a typo and it is actually 49'. Their web site now lists it as 49'.
In my opinion, the seven feet is worth it. Depending on how you use your van. My last van, that I built up myself, did have a 39'-6" curb to curb. My SMB will be down close to that when I get back home and work on it. Can't turn too tight, stop too quickly or have too much money....
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Old 05-24-2007, 10:32 AM   #4
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That would be a 19.5 foot radius. Curb to curb is a diametral measurement.
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Old 05-24-2007, 06:00 PM   #5
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That would be correct. Curb to curb seems to be what everyone really either means or measures and is what SMB quotes on their web site.
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Old 05-24-2007, 07:02 PM   #6
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I know we all knew that. It's just the wording. I'm an engineer. Forgive me.
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Old 05-24-2007, 10:23 PM   #7
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I can relate to the problem - I'm an engineer too. Just retired.
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Old 07-29-2007, 05:24 PM   #8
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Well, I've got my curb to curb down to 45' and that's all I'll be able to get. This is with the 315 tires. I made up a new pitman arm and the restriction to a tighter turn is that my tires are rubbing on the sway bar. The only way to go tighter is to remove the sway bar, go with smaller tires, or more offset to the rims. None of the above is acceptable to me, so I'll be living with the 45 feet. Not too bad.
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Old 07-29-2007, 06:52 PM   #9
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You forgot rear steering.
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Old 07-30-2007, 07:57 AM   #10
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Jeez Jage, you really want to give me a project don't you....
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