The twins have a more relaxed 28 degree rake, but a substantial amount of offset in the triples to compensate to make the steering still quick (very short sporty trail spec resulting). The GS 4 cyl models mostly come with a 27 degree rake and less triple clamp offset. A 19-inch on the front of a GS twin may slow down the steering too much, as well as add more rotating weight and unsprung weight. I would look into retrofitting the first few years of GSXR front wheel. 18x2.50, but then you have to figure out how to fit the back wherl, custom spacers, sprockeT carrier cush drive swapping to get the correct chain line, swingarm width tire clearance checking....
If possible, then running the shortest front tire possible, 100 / 80 - 18 maybe. Then running a single disc GS550 fork or a GS500 fork in 83 GS1100E triples, both of which could use the twin pot calipers and 310 mm 98-99 CBR900RR rotor. The triples would have less offset than the original 450, but the shorter diameter tire would make up for that
Clearly 77-79 GS twin wire wheels are a far easier route, as you can lace up some $100 rims from MikesXS.com in 2.50x18 rear and 2.15x18 front and you will end up with a substantially better contact patch and ability to run widely available tires like the Battlax BT45 & BT45V (higher speed rating), which comes in dual compound for the rear only, which is where they wear flat.
Then ditching the spindly 33mm stock forks fir a set of 35mm GS550/650 forks or a set of 37mm GS500 forks in 82-83 GS1100E triples, with appropriate fork braces, will be a HUGE upgrade and takes GS axle diameter (need axle spacers from a 37mm fork bigger GS - 78-79 1000C/N may do the trick).
If possible, then running the shortest front tire possible, 100 / 80 - 18 maybe. Then running a single disc GS550 fork or a GS500 fork in 83 GS1100E triples, both of which could use the twin pot calipers and 310 mm 98-99 CBR900RR rotor. The triples would have less offset than the original 450, but the shorter diameter tire would make up for that
Clearly 77-79 GS twin wire wheels are a far easier route, as you can lace up some $100 rims from MikesXS.com in 2.50x18 rear and 2.15x18 front and you will end up with a substantially better contact patch and ability to run widely available tires like the Battlax BT45 & BT45V (higher speed rating), which comes in dual compound for the rear only, which is where they wear flat.
Then ditching the spindly 33mm stock forks fir a set of 35mm GS550/650 forks or a set of 37mm GS500 forks in 82-83 GS1100E triples, with appropriate fork braces, will be a HUGE upgrade and takes GS axle diameter (need axle spacers from a 37mm fork bigger GS - 78-79 1000C/N may do the trick).
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