Hwy 50 is one of my less favorite roads to ride, since there is so much traffic and the scenery is less dramatic than in some other areas. If you insist on 50, you could head north from Gunnison up to Crested Butte, and then over Cottonwood Pass (dirt, but ok for road bike) and down the other side to Buena Vista.

I can't tell from your post if you are day-riding or credit card touring, which will affect the planning.

Right now, Wolf Creek Pass and the South Fork / Creede area are on fire, otherwise I would suggest to you my very favorite loop, Gunnison - Lake City - Creed - South Fork - Pagosa -Springs - Durango - Montrose - Gunnison. You get a little of the best parts of 50, and a lot of other stuff that is truly spectacular.

This may or may not be an option in July/August, you'll have to check the fire situation. RIght now it is huge and 0% contained. By then, who knows what else might be on fire.

Summit County, the Copper Triangle route, Trail Ridge Road, the loop above, the Grand Loop (in the other thread), the Death Ride (Durango, Telluride, Cortez), Grand Mesa, Hwy 92 north of Blue Mesa, Independence Pass.... there are many other options that are better and with less traffic. 50 is not "suicide" but there are a ton of options that are nicer.

You could also take a look at the USA Pro Challenge thread, in August you could follow the race and do a bunch of great riding.

In July & August it will be blazing hot at the lower elevations (Denver, Durango, Pagosa, Grand Junction, all around 5000'-6000') but the high country (Summit county is high) is good.

Can you carry your bike on your motorcycle? I've seen that - pretty cool.