Other than the fairings, are there any BIG differences between the touring Harleys when it comes to STABILITY for all day interstate travel at 90+ mph?

 

well, not really, the chassis, drivetrain etc is all the same model to model ( within same model year). some have lowered rear by 1", that would be the only diff in suspension

the fairing design is HUGE at that kinda speed. the batwing fairing will unload the front end at high speed, traction is reduced...this can get tricky in sudden crosswind gusts.
the fork mounted fairing can turn gusts to "steering input", and traction is maybe not optimal because of the fairing "lift".
klockworks has claimed their windscreen helps counteract this- I dunno.

a sharknose may be smarter.
the frame mounted fairing reacts very differently to crosswinds/gust and i don't think the fairing unloads the front like the batwing--- and I have ridden those speeds sustained on one

( I ride a batwing- a rarely creep over 80 and I like other aspects of the batwing over the shark.
at this point I've figured out that fewer fuel stops make for a quicker overall trip, so a lower speed may get you there quicker)

Mike

 

You'll need to get a stealthglide. They are the most stable and the troopers can't track them at 90 mph + speeds all day. AYKM?

 

At 90+ all day?...You won't be around long enough to make any difference....lol....

 

I have a batwing but at 90mph all day you might as well get a roadglide as others have said. Though 90 seems a tad extreme, not sure of what your background is on bikes but at that speed might as well get a crotch rocket & some good leathers.

 

Yeah what he said.

 

cruise control kicks out at 90...low 80's with a batwing is fast enough for this old fart. your gas mileage is really going to suck at 90+...plus johnny law does not take kindly to any one going that fast over the speed limit.

 

It's been nice knowing you.

 

I'd go with a Roadglide, if only for the gas mileage. I switched my previous bike from a batwing to a sharknose & gained 2-3 mpg on average with no other changes. I also gained 5-8 mph top speed, the batwing gives good protection from the elements, but as for aero it's a big barn door. I'm guessing at 90+ you'll gain at least 5 mpg.

 

There are certainly advantages to the Shark. Not having the weight of the fairing on the forks is the biggest one. The problem with it is that it's so far out front, the airflow around it converges right where your passenger's head is, causing a ton of buffeting. This can be somewhat mitigated with various baffles and windshields, but your backseater will never have the same serene ride (s)he gets on a Batwing.

We're it not for the fact that I ride 2-up so often, I would have bought a Roadie, no doubt about it.