The axle diameter is the same, I don't recall if it is the exact same axle or not. But the GSXR front end didn't really work out. Tree offset brings the forks too close to the bike and using the stock 19'' tire up front created some serious tire-to-header clearance issues. Also, they are so short ( about 2.5-3'' shorter than stock) that ground clearance was also an issue.
I ended up just popping that front end on to my '76F right before I sold it. Those forks did ride beautifully, though. Extremely smooth and properly sprung for a bike of this weight.
I ended up with CBR1000 forks (Hurricane) on this bike. I thought conventional forks looked more like they belonged and they gave me really nice ground clearance. The forks go on with an extremely simple stem swap and tapered bearings. The trick was mounting the CB hub to retain a 19'' spoke rim.
Quick dump of the whole process. I can provide details if needed.
Had to make a new axle spacer for inside the hub since converting to a 20mm axle. Kept the wall thickness pretty thick since it's AL, so needed a way to be able to knock the bearings out on a later date if needed. So I went with notches.
It droops a tad, but the axle goes in easily anyway. Plenty of access there to remove the bearings.
I think I'm actually using this rim backwards on this bike due to making room to use the speedo drive that came with this front end. It was designed to run on the left side of the rim and I'm pretty sure stock on the SOHC bikes was opposite. I don't know...just make it all fit,right?
Anyway, here's what it started as:
The original lip on the SD kept it from being able to hit the bearing inner race so that had to be trimmed. Once on the axle, and in the forks, I just tapped the axle deeper and deeper until the rim was centered. That made it where I didn't have to shave the SD down any and only would have to make a spacer for the right side of the bike.
This left a gap between the hub and the SD,of course. Made a spacer for that. Looks like it's touching,but it has .010'' of room to float.
You probably noticed the machine screw on there. I tapped a hole in the hub to put that in there to drive the SD. Just gotta get a 10-32 set screw to replace that with that will sit flush and not interfere with the rotor.
You probably also noticed that the bearing retainer portion of this rim was pretty chewed up looking. Those bearing retainers aren't really needed. If you look at modern bikes they don't use them. Once both bearings are in and the spacers are clamped between the forks the rim can't move off the bearings. But since this thing was chewed I just decided to make a spacer to hide it. Was easier than unlacing the rim to turn that face down pretty again.
Just like the other spacer this one looks like it's touching but it floats. Its locked to the bearings,of course,but has .010'' gap away from the rim.
