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Truck wheelbase - How to measure
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Millhouse
Posted 2/18/2009 19:42 (#614263)
Subject: Truck wheelbase - How to measure


South-central Nebraska
From where to where do you measure for wheelbase on a semi tractor?
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77 Farmer
Posted 2/18/2009 19:44 (#614268 - in reply to #614263)
Subject: Re: Truck wheelbase - How to measure



Southeastern, IL
center of front to center of rear axle
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bowtieighth
Posted 2/18/2009 19:48 (#614274 - in reply to #614263)
Subject: RE: Truck wheelbase - How to measure


Bethany, MO
If it's a tandem (3 axle tractor), center of front axle to trunnion (center of rear axles) (US tandems NORMALLY ~52")


Edited by bowtieighth 2/18/2009 19:48
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77 Farmer
Posted 2/18/2009 19:55 (#614291 - in reply to #614274)
Subject: Re: Truck wheelbase - How to measure



Southeastern, IL
If you are talking about a semi tractor wheelbase is figured from center of front axle to center of last axle. Has nothing to do with ceter of tandem.
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farmerbroun
Posted 2/18/2009 20:02 (#614301 - in reply to #614274)
Subject: RE: Truck wheelbase - How to measure



 I agree. On a 3 axle tractor, center of front, to center point of rear two axles. And from what I have read, wheel base on a trailer, is from king pin to center point of trailer tandems.

 opps,,, meant to reply to bowtieighth



Edited by farmerbroun 2/18/2009 20:04
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bowtieighth
Posted 2/18/2009 20:33 (#614347 - in reply to #614301)
Subject: RE: Truck wheelbase - How to measure


Bethany, MO
Never dealt much with wheelbase on trailers. Just OAL, pin setting, west coast tandems (that one may date me), tuck tandems, etc.
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bowtieighth
Posted 2/18/2009 20:53 (#614381 - in reply to #614291)
Subject: Re: Truck wheelbase - How to measure


Bethany, MO
I'll disagree.
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NB4020
Posted 2/18/2009 21:12 (#614422 - in reply to #614263)
Subject: RE: Truck wheelbase - How to measure


Woodstock,New Brunswick.Canada
The DOT around here measures them the same as 77 Farmer said from the center of front axle to center of rear axle.
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bowtieighth
Posted 2/18/2009 21:18 (#614441 - in reply to #614422)
Subject: RE: Truck wheelbase - How to measure


Bethany, MO
Ok. I was wondering about this. They're measuring the distance between Axle 1 and Axle 3 for bridge laws. If you go to Peterbilt and order a 280" wheelbase truck, #1 to #3 will be roughly 306". 280 + (52/2) = 306

Edited by bowtieighth 2/18/2009 21:20
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obie_iaffa
Posted 2/18/2009 21:30 (#614455 - in reply to #614263)
Subject: Re: Truck wheelbase - How to measure


NE Iowa
Center of Front Axle to center of the two rear axles, as that's your pivot point on the back end. Got a couple IH9400's and the wheelbase stamped inside the door frame is the distance fron front center to the middle of the two rear axles
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RodInNS
Posted 2/18/2009 22:40 (#614575 - in reply to #614263)
Subject: RE: Truck wheelbase - How to measure


If you're talking about OEM wheelbase measurements, then they're taken from the hub of the front axle to the midpoint between the tandems. A single would be from hub to hub. A tri-drive would be to the hub of the center driver.
If you watch the mirror closely in a hard inside turn you'll also notice that the front tandem scuffs IN and the rear tandem scuffs OUT, thus the wheelbase, or pivot point is halfway between the two.
What the DOT may or may not do isn't particularly relevant if you're talking about OEM wheelbase.
The distance I've described will correlate directly to the information placed on the drivers door post or wherever the VIN tag is located.

Rod
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farmerbroun
Posted 2/18/2009 23:12 (#614607 - in reply to #614422)
Subject: RE: Truck wheelbase - How to measure



 Far as I know, DOT don't give a rip about wheel base. They only care about length between axles.
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Gary Lyon
Posted 2/18/2009 23:42 (#614620 - in reply to #614575)
Subject: RE: Truck wheelbase - How to measure



Southeast Wyoming
As you say, the guys are talking about 2 different things.  My truck is spec'd at 240" wheelbase; that is measured from steering axle to "trunnion".  If I'm measuring for the bridge formula, it is 265" from the steering axle to the rear driver, w/ 50" spread between the drivers.
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Harvestmoon
Posted 2/26/2009 22:33 (#624437 - in reply to #614620)
Subject: Re: Truck wheelbase - How to measure



Center of the front axle to center of the rear axles. Is the right way to measure the wheel base.
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