GL 1500 wheel on 1200 for CT? - Page 2 - Steve Saunders Goldwing Forums

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post #11 of 23 (permalink) Old 04-14-2019, 02:49 PM
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somewhere in the 1500 model year they went from 6 pin drive to a 5 pin drive on the rear wheel? yes? 6 pin drive on 88-90? and 5 pin drive from then on to 00? hummmmm???
The 6-pin drive was 88 - 89 Years. The 5-pin drive 90 - 00 Years.
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post #12 of 23 (permalink) Old 04-15-2019, 02:48 PM Thread Starter
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got it. holes on swingarm need to be drilled out to 7/16" for larger studs on final drive (FD) the 88-89 GL's used 6 pin drives, 90 on had 5 pin drives. the drive splines shd be the same on either, but the 84-85 had a different hub on the drive flange than the 86-87 final drive spider/FD. disc bracket needs to be ground down to 1/2" as the FD is moved over to the L side ...??? where it looks like there is only the spacer IN the wheel, disc brake bracket, 1 flat washer, swingarm. just too much work for me, im too old to mess with all that , I wud like to ride the bike a few more times before I expire and not expire working on the thing. it is not that important.


doubt the machine will last more than 1 more season before it has some kind of catastrophic (Ignition pick ups) failure and just not worth the effort to take the WHOLE machine apart again to replace 2 things that shd have been put on ... most anywhere but where they put them, that are no longer available anyway. lessons learned again, buy a "cheap" bike n spend more on it than it is worth and not be able to trust it to WM 6 miles away. expensive lesson # xxx.


I wish I had money to buy NICE NEW THINGS that didn't have to work on more than get to use them. that wasn't fun many, many, many years ago when I was poor, in better health and couldn't afford decent things, it is not fun now that im older, in poor health and cant afford to have decent things that work
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post #13 of 23 (permalink) Old 04-15-2019, 04:55 PM
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post #14 of 23 (permalink) Old 04-15-2019, 07:15 PM
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Quote:
Originally Posted by MICK MACK View Post
doubt the machine will last more than 1 more season before it has some kind of catastrophic (Ignition pick ups) failure and just not worth the effort to take the WHOLE machine apart again to replace 2 things that shd have been put on ... most anywhere but where they put them, that are no longer available anyway.
The 84 pulse generators are less likely to fail than the later ones.

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post #15 of 23 (permalink) Old 04-16-2019, 12:46 PM
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I am doing this very conversion to my 84 1200. However I also installed the front forks, wheel/tire, brakes and fender from the 1500 too. So, my bike will have a 18in front and a 16in rear. I have the front finished and it fits great. I still have the rear to do.

I am doing this to a 1200 Aspencade that I have stripped naked. I wanted the better tire sizes so I could find good ADV type tires. I also wanted to get away from the Aspy air suspension and the 1500 donor does not use air in the front. For the rear I am using 2 no-air 1500 shocks.

BTW the 1200 looks good with a 1500 front end on it.
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post #16 of 23 (permalink) Old 04-17-2019, 10:53 AM
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Mick Mack, You do "need" to use the GL1500 final drive. In doing so it will gear your GL1200 a little higher (a good thing).

Just thought I would point out that this is not true. The GL1200 and the GL1500 have the same final ratio. The ratios in the trans may be very different, the final drive is the same. (2.833 )
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post #17 of 23 (permalink) Old 04-17-2019, 12:07 PM
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Just thought I would point out that this is not true. The GL1200 and the GL1500 have the same final ratio. The ratios in the trans may be very different, the final drive is the same. (2.833 )
Have you ever made the change.....??

Tell that to my friend who made the change on his 1986 GL1200......!!
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post #18 of 23 (permalink) Old 04-17-2019, 12:41 PM
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The difference in gearing could be due to the rolling diameter of the tire.
Though that is only a little more than half an inch.
.
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post #19 of 23 (permalink) Old 04-17-2019, 03:26 PM
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Final Drive Gear part numbers:

1988 - 2000 (GL1500) 41310-MN5-305

1986 (GL1200) 41310-MG9-000
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post #20 of 23 (permalink) Old 04-17-2019, 03:39 PM
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Actually, 1200 and 1500 have same final drive RATIO ... but they are not identicle parts, but since the 1500 rear wheel and 160/80-16 tire is taller than the 1200's 150/90-15, you'll see a slight RPM drop at speed as engine drives rear wheel, speedo registers off front wheel. You can use a 150/80-16 tire on the 1500's wheel bringing overall "MPH<->RPM ratio" back closer to OEM.

The 1500 rear disc is larger (315mm) hence the need to use 1500 caliper bracket which gets narrowed some when the shock lower bolt gets shortened on end. This will result in slightly more rear brake due to increased "leverage" of larger disc and greater swept area. Same caliper.

The 1500 wheel has more meat in hub area supporting it's OEM double row drive side bearing.

There are a number of threads already listed that detail the swap, but from another thread, here are pics of a GL1200 with 1500 final drive and with General Altimax 195-55-R16 CT (car tire)

.
.
.
1997 GL-1500 SE / 1998 Lehman GTL Trike
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