Join Date: Mar 2011
Location: Fairfield, Virginia, USA
Model: '97 GL1500SE/ '98 Lehman GTL Trike
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
...(Candy Spectra Red )
GWRRA, NRA, & VSPA Life Member
"Make Courtesy Your Code of the Road!"
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.