18 inch rear wheel on an XS1100

[DEEBS11]

Yes, you cut a piece from an old female splined driveshaft and notch the end that faces the weld (and the existing driveshaft). Then you notch the end of your existing driveshaft. Then you line the splines up together by slipping a driveshaft spline into both and then you weld them together. Once welded, the shaft slips out and you have your extension with full splines for an extra heavy duty set-up. The sidecar bike is pushing a lot of weight. Steel sidecar, people and gear. No wonder I am going through tires.

[bikerphil]

If you sacrifice an extra driveshaft yoke, you would cut a piece from that which already has the splines and weld it onto the existing unit. That would take the place of the 16mm spacer.

[Radioguylogs]

I don't get it....unless the spacer has matching splines machined into it.

[DEEBS11]

Another thing to think about is with the 850 drive mod, you are only using 2/3 of the driveshaft splines at the U joint due to the 16mm spacer you need. Might not be the best idea with the added weight of the rig. Who knows?

I think 3phase had a custom yoke welded up so the full depth of the drive splines could be used.

Phil, I am looking at the 850 rear drive modification to make up for the small diameter car tire. I read up on the subject and would definitely weld an extension on the universal joint. It's crazy to reduce the spline surface with that kind of torque pressure.

[DEEBS11]

Good point, Phil. While lowering the diameter to 15" I might have to machine the caliper in order to wrench it on or off. Might have to remove the wheel to get at the brake to change pads every so often. Not a big deal.

[bikerphil]

Don't forget to leave access to the small screw on the back of the brake caliper, or maybe just leave the screw out.

[DEEBS11]

Thanks Phil & Bob. Very valuable info. I CAN be done and it HAS been done. Perfect. This is the wheel that will be modified to fit the XS11 hub.

[Ranger_xs1100]

I don't know if this will help or not, because photobucket ruined the pictures/

Promised swingarm mod - XS11.club Forums

[bikerphil]

Hey Deebs, I know Topcat did the swingarm mod years back. There was a thread about it, IDK if it survived the move from .com, I couldn't find it. There was a UK site where those fellas did mods like this, it's a shame all that valuable info got lost too.

Just an idea, there is more room to shift/shim the wheel over to the right side a bit. I wouldn't think with running a hack, the alignment with the front wheel would be quite as crucial.

[DEEBS11]

[DEEBS11]

[DEEBS11]

I am also seeing a possibility that the 81 XS and XJ1100 have a little relief cut on that spot for a wider tire. Is that possible?

[DEEBS11]

However, this is the spot that would be the most problem. The reduced diameter of the wheel will bring the widest part of the tire right here. Wonder if I can cut and weld a small relief in that area without hitting the rotating shaft.

[DEEBS11]

Does someone have the inside width of an XS11 swingarm where the top of the tire resides?

[DEEBS11]