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Gents here's an idea that crossed my mind the other day when I read another post asking about putting an 18" spoked rear wheel on the back of a CM400.
The easy solution is to find a CB400T1 hub
(CB400T2 had Comstars)
and lace up an 18" rim wide enough for the tire you want to mount and it's a direct bolt-on.
I had one of those hubs around and I sold it to a member here but didn't think to measure it before I shipped it. Here are some photos for help identifying one:

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But these hubs are getting hard to find so....

My idea is to substitute the rear drum hub from a 91-08 CB250 Nighthawk. This brake drum is 10mm narrower than the CB400T1 drum, so that will be a show stopper for some. Wheel spacers would have to be determined, but apart from that here are my notes:

91-08 CB250 Nighthawk
15mm rear axle
rear bearings #
6302.* 15x42x13
(same on both sides)

Adapt to bolt on to a CM400 with 2 replacement wheel bearings DG1742RSC3 17x42x13mm
Bore out brake carrier to 17mm (.669")
Bore center bearing spacer to 17mm
or replace with custom made spacer same length but 17mm bore.*
(I haven't had a spacer out
to measure)


CM400
17mm rear axle
Rear bearing on the Drive Side
6304z** 20x52x15
(20mm ID because spacer collar
slips into drive side bearing with a shoulder to keep it in place, a cool trick)
Rear bearing brake side
6303u** 17x47x14

CB/CM400 rear drum has the words:
Max Diameter 141mm about 5.5"
but the
CB250NH rear drum has the words:
Max Diameter 131mm about 5.125"
NH brake is 10mm smaller diameter.

The NH wheel comes
with a 16x2.5 rim

Use 9ga x 165mm spokes from ebay
to lace it up to an 18" rim with appropriate width for the rear tire you want to run.

Also worthy of consideration:
2000-2016 CMX250 Rebel can probably be adapted as well but is a different style hub with 131mm max dia drum and 15mm axle.
 
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