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Old 02-11-2016, 10:41 AM   #1
Bus Nut
Join Date: Jul 2011
Location: Virginia
Posts: 446
Super Single Rims?

Has anyone ever considered or changed the rear dual rim configuration to a Super Single rim/tire like many Class 8 HDT rigs run? The rim/tire should be more than capable of supporting a coach since a Class 8 rig tows 80,000lbs.
Also, has anyone ever removed the tag axle? Once again seems like it might not be needed since a coach conversion will carry less weight than a normal passenger coach. Removing the axle would create space for more storage and be less parts to maintain/break. Would removing the tag axle affect the stability, safety or operation of the coach in any way?
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Old 02-11-2016, 01:15 PM   #2
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Is this a school bus?
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Old 02-11-2016, 02:32 PM   #3
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Join Date: Feb 2015
Location: South Dakota
Posts: 193
Year: 2002
Coachwork: Thomas
Chassis: Freightliner HDX
Engine: CAT 3126B250
Rated Cap: 84
My thinking is this:

Dually rear tires means if you lose 1, you can still limp it to get it fixed, depending where you are. With a super single, that corner is done and you'll have to wait for a service vehicle, or worse, have it towed.
My project: The Cruel Bus
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Old 02-11-2016, 03:09 PM   #4
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Join Date: May 2010
Location: Montana
Posts: 1,614
Year: 1995
Coachwork: Blue Bird
Chassis: All-American R/E
Engine: 8.3 Cummins
Rated Cap: 72
Plus poor ride, and a lot of initial expense.
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Old 02-11-2016, 03:53 PM   #5
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Join Date: Nov 2015
Location: Billings, MT
Posts: 436
Year: 2003
Coachwork: Thomas
Chassis: HDX
Engine: Cat C7
Rated Cap: 84 passenger
Amen to that!
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Old 02-11-2016, 04:16 PM   #6
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Join Date: Jul 2011
Location: Winlcok, WA
Posts: 903
Some 40' coaches were built with only two axles. Those buses were built with a longer wheelbase in order to account for the lack of a tag/bogey axle.

It would be possible to take the tag/bogey axle off but one has to wonder what benefit you would get from doing so.

In order for it to work you would have to move the drive axle if you remove the tag axle. Since the bogey axle is in front of the drive axle you wouldn't have to move the drive axle on a bus with a bogey. But with a tag axle there would be way too much weight behind the drive axle so you would have to move the drive axle towards the rear. How much you would have move the drive axle would require you to determine where the factory located the drive axle on two axle coaches.

Besides weight carrying capacity you would also lose another axle's braking ability. I am of the school of thought that says you never have too much braking ability.

If you really don't want a three axle 40's coach I would hold out and purchase a coach that came from the factory as a 40' two axle coach.

As far as using a super single, I have never seen a coach or bus set up with one. I am not saying it can't be done. But for what it would cost I just don't see the benefit. With all of the wheels the same you could limp home if you had to by moving wheels around. With a super single you would need to call road service out to help.
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Old 02-11-2016, 05:43 PM   #7
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Join Date: Jan 2015
Location: ...little north of Toronto Ontario
Posts: 329
Year: 2000
Coachwork: Thomsass
Chassis: Freightshaker
Engine: 5.9 cummins 5 speed
Rated Cap: 6 passenger 2 ATV's
I inquired about the super single in my build thread a while back...had access to two rims. Thought it would look pretty cool with a bigass tire out back, tubbed look. It's legal according to our tire guy and safety and compliance. said above, huge cost for a road side repair. $1000 a tire from a tire shop here in Ontario, probably $1200 from a mobile guy...that's if you didn't roll the edge of the rim over from the weight of the bus/coach. also have two rolling spares to get to out of a jam, if you got a front flat you could steel one of the rears to hobble yourself to safety. Hydroplaning could be a issue as well.

This guy showed up at the beer store on Sunday with his pick up, he removed the front drive, and fifth wheel, installed super singles, put fuel tanks from a Pete, turned the bunk into a tool box. The bunk and box are removable, he said he has an 8.3 cummins with a 13 speed direct and runnin' low 15's at St. Thomas and Grand Bend drag strips.
It's a '96 freightliner
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