Progressive 412 Rear Suspension


Information and questions on GL1100 Goldwings (1980-1983)
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wren337
Posts: 4
Joined: Sun Jun 07, 2020 9:25 pm
Location: Detroit Metro
Motorcycle: 1982 GL1100

Progressive 412 Rear Suspension

Post by wren337 »



All, apologies for starting a new Progressive Suspension thread.

I see on their website that the correct suspension for my 82 GL1100 is the 412-4222C, plus a .25" travel limiter to keep the tire off the fender. The 412-4222C is out of stock, and also I wanted black instead of chrome. My bike is "naked" and I've bobbed it a bit, so lighter than a full dresser could get up to.

They have a technical spec online that tells you the difference between the different shocks at:
https://www.progressivesuspension.com/a ... h-Info.pdf

Per that doc, the 4222C is a 13" with 3.89" of travel. With the .25" travel limiter you'd be at 3.64" of travel. The (progressive) spring rate is 140/200.

Screenshot of Progressive spec
Screenshot of Progressive spec

I looked back at the 77 GL1000 which wasn't factory available as a dresser, and it took a 4224C with 120/170 spring rate.

I wound up ordering the 412-4077B which has 3.48" of travel (so, 0.16" less than recommended) and 105/150 spring rate. This shock is recommended for a number of Harleys (Road Kind, Electra Glide) that have to weigh as much or more than my bike. Also the 4077B is black.

I'll reply here once I get mounted and tested out. I didn't see anywhere online where anyone was contemplating going off the reservation on the recommended shock so I thought I'd drop a post here for posterity.

Any bets on if it will be too soft?
Nathan



User avatar
wren337
Posts: 4
Joined: Sun Jun 07, 2020 9:25 pm
Location: Detroit Metro
Motorcycle: 1982 GL1100

Re: Progressive 412 Rear Suspension

Post by wren337 »

Put the shocks on today. I hadn't considered that the 4077's would only come with the bushings they're expecting you to need. I got away with it but if you were to try a different part number you might have issues figuring out the bushings.

The top mounts were fine with just the metal sleeve that comes pre-installed. The bottom R was also fine with no bushing. The bottom L which is the only one that takes a bolt, I was able to re-use the bushing from my factory air shocks.

I also needed spacers and the ones included were the wrong ID. I wound up getting 5/8 by 1" spacers at the hardware store, 3@14 gauge and 1@18 gauge for each side worked out to 7mm.




(The outside washers are there to make up for the missing grab bar.)

The ride height is good at the center setting at 11.75", and at the top setting with my wife on the back. The ride is much improved over my air shocks which wouldn't hold pressure.



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