Air shock fittment


Information and questions on GL1100 Goldwings (1980-1983)
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702scottc
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Location: Las Vegas, Nevada
Motorcycle: 1980 GL1100 Interstate (sold)
1990 GL1500 Aspencade (sold)
2005 GL1800

Air shock fittment

Postby 702scottc » Tue Jun 25, 2013 4:31 pm



Does anyone know if the rear shocks from a 1985 1200 Aspencade will fit my 1981, 1100? I know the shocks from the 85 are about an inch longer, [wouldnt be a bad thing] ? If they a physically the same then I think they would work. Any thoughts??



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WingAdmin
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Re: Air shock fittment

Postby WingAdmin » Tue Jun 25, 2013 8:40 pm

Sure, you might be able to shoehorn them in there, but it will lift the back end of the bike an inch. If you don't do anything to the front end, the end result is that you reduce trail on your front wheel, which makes the steering much less stable (more twitchy), and much more prone to irrecoverable speed wobble.

Suspension involves complex geometry, you can't just go in and modify something and not expect it to have (sometimes unintended) results.

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702scottc
Posts: 252
Joined: Tue May 15, 2012 12:12 am
Location: Las Vegas, Nevada
Motorcycle: 1980 GL1100 Interstate (sold)
1990 GL1500 Aspencade (sold)
2005 GL1800

Re: Air shock fittment

Postby 702scottc » Tue Jun 25, 2013 9:20 pm

thanks for the info. I have already made some modifications to this bike. I switched from the 17" rear tire to the 16" like the later models use. I also switched to the 18" front. This effected the trail as well as the rake. it handles well but drags the center stand on tight turns, especially 2 up. The longer rear shocks should offset the trail loss from the smaller tires. The smaller tires are way easier to find and I use a 402 Dunlop rear Harley tire thats specifically for heavy touring bikes. I still need to replace the front fork springs with a set of new progressives but the oem fork springs with around 15 psi seem to work well.

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80-GL100-INT
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Re: Air shock fittment

Postby 80-GL100-INT » Wed Jun 26, 2013 7:26 am

WingAdmin wrote:Suspension involves complex geometry, you can't just go in and modify something and not expect it to have (sometimes unintended) results.


Another thing to keep in mind with the height changes here and there (especially to the rear), is the strain that will be put on the drive unit. You have changed the load angles on the bearings.
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User avatar
702scottc
Posts: 252
Joined: Tue May 15, 2012 12:12 am
Location: Las Vegas, Nevada
Motorcycle: 1980 GL1100 Interstate (sold)
1990 GL1500 Aspencade (sold)
2005 GL1800

Re: Air shock fittment

Postby 702scottc » Wed Jun 26, 2013 5:08 pm

I doubt the load angle is too big a deal, the point load on on the axle, swingarm, and tire remain pretty much the same. We are only talking about realistically maybe gaining 3/4" of an inch over stock. Every time you hit the 2 up button on an 1800 the bike lifts and changes the center of gravity, same thing on this. I appreciate the info..




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