Okay, so the long version for Colorado...
CO 12 between Trinidad and US 160 just outside of Walsenburg. All Paved. Very scenic and twisty.
If you prefer dirt, come out 12 from Trinidad to CR 41.7 and head NW. All dirt. It eventually cuts back NE and hits CR 42.0. Take that a short way to CR 46.0 and hang a Left (West). This runs all the way to 12 just South of Cuchara, crossing Cordova Pass along the way. All dirt. All incredibly scenic. All big bike friendly. There are TONS of other roads in this area though. There are a few decent places for food in Cuchara.
From Walsenburg, run CO 69 NW to 96. All paved. Fun twisty ride through the mountains. From here, I usually head back East a bit and make a run down CO 165 until it starts to straighten out, then I turn around and run back up to 96. Along the way you can stop and check out Bishop's Castle. I then head up to Canon City.
On the West side of Canon City, just off US 50 is Skyline Drive. It is ONE WAY and the width of a car. It is paved. You can fall off each side... It drops you back into town. There are cool views from the top, especially of a massive MX motorcycle/bike park that seems to wrap around the West side of the city!
US 50 all the way from Canon City to Montrose is really nice with several passes along the way. All paved of course. It is fun to stop at the Royal Gorge Bridge just West of Canon City. Do the nine story high swing that sends you flying out over the gorge... You will scream like a little girl
I don't know if they still allow it or not, but we rode over the bridge and went out of the park via a back exit. That road was kind of cool (paved). If you want some dirt, do Old Monarch Pass West of Poncha Springs.
CO 9 between US 50 and I-70. All paved. This has a bit of everything from high plains to serious passes and vistas! The ride through Leadville in particular is great.
Old Hwy 6 East of Dillon up and over Loveland Pass. All paved. Great views. Fun twisties when you drop back down to I-70.
CO 103 South from Idaho Springs on I-70 to CO 5. Run up 5 to the top of Mt. Evans. Come back down and run 103 over Squaw Pass to Bergen Park. LOTS of fun twisties and crazy views from the top of Mt. Evans if it is clear! Be sure to stop at Summit Lake on the way up. From Bergen Park, get back up to I-70 then on US 6 a short bit to reach CO 119. Run 119, 72 and 7 all the way up to Estes Park. This is called the Peak-to-Peak Hwy. It is a superb paved ride, but there is a chance of traffic, especially on the South end and up near Estes Park. All paved.
US 34 through the Rocky Mtn NP. Might be a lot of traffic depending on when you ride it. Crazy awesome scenery. WATCH your speed... Just saying...
Co 134 between US 40 North of Kremmling over to Toponas, then 131 South to I-70. All paved, cool scenery and fun curves.
I-70 from Idaho Springs to Grand Junction. Yeah, I know, this is an Interstate. But it is actually a really nice ride! This is especially true as you approach Glenwood Springs.
Co 82 South of Glenwood Springs through Aspen and over Independence Pass to US 24. Don't even bother stopping in Aspen. The level of pretentious snottery is off the charts. Gas and food is WAY over priced. They will ticket you if you park your bike anywhere other than the little spots right at the intersections where people can hit them...
They don't even care if you cram four bikes into ONE regular parking space. Nothing to see here... move along...
The run over Independence Pass is really cool. For a bit of dirt, Lincoln Creek Rd and South Fork Leg Creek Rds are both dead ends but lead to cool spots with waterfalls. You could do them on most street bikes if they are dry.
Co 133 Southest from Carbondale up and over McClure Pass to Hotchkiss is great. All paved. Sometimes it is fun to head South on Co 92 from Hotchkiss along the North side of the Black Canyon of the Gunnison. VERY scenic and fun! Just watch for loose cattle
The other option is to continue past Hotchkiss and head North on Co 65 over the Grand Mesa up to I-70. This is all paved, has great twisties, and is very scenic as well. For amazing dirt, head North from Paonia on 133 up Steven's Gulch Rd., to CR 265. After Buzzard CReek, pick up CR 266 and follow the creek to CR 330, turn Northeast and head toward Fairview Rd. From there you can run various backroads into Rifle. That is all dirt and really awesome. Just North of Rifle is W. Rifle Creek Rd. It is dirt/gravel. Hang a left on Piceance Rd., cross Co 13 and pick up CR 5. CR 5 is paved all the way up to US 64. This and 64 into Rangley are nice.
Let's head back over to US 285 at Buena Vista. Head West out of town on CR 306. This goes to Cottonwood Pass. It is paved on the East side of the pass, dirt on the West. Although, the dirt on the West side is VERY well maintained and I have seen street bikes riding it without issue. It runs down to Almont. OR... you can head North at Taylor Park Reservoir on NF 742. At NF 748, cut back to the Southwest until you hit Spring Creek Rd. This is a really nice loop around the reservoir, dropping you back on 742 just North of Almont.
In Almont, you have to drive through a trailer park, through the fence, and behind a tree to pick up the beginning of NF 743 on the East side of town. Just a short bit out of the park, the road turns South and starts a serious climb through some crazy tight switchbacks, barely big enough for a big adventure bike to make the turns at full lock. You DO NOT want to be on this if it is wet. At the top, just head East and stay on 743. It gets MUCH easier at the top. 743 eventually loops back to the Southwest and comes out just North of Gunnison. It is all dirt. The sections up in the Aspen trees are incredible. You have to stop and sit for a while, just to listen to the trees whispering to you.
Of course, there is 149 from US 50 down through Lake City, Creede, and ending in South Fork. All paved. All fantastic. Stop at North Clear Creek Falls along the way. They are off CR 16. You can also follow CR 16 beyond the falls for a nice short dirt ride that eventually brings you back to 149.
If you happened to have come down Co 92 from Hotchkiss, right near where 92 hits US 50, you should see CR 25 running South down to 149. This is unpaved, wide and well maintained gravel. Very fun and pretty.
If you skip over on 149 to the East toward Powderhorn, head South on CR 27 along Cebolla Creek. Stay on CR 50 and keep following the Creek West back to 149. All dirt. I love this section. There is rarely ANY traffic and it is very pretty.
If you veer East on CR Kk-14 instead of CR 50, you can run that East to CR Nn-14 and run that Southeast to Co 114, or you can run it North to 114 and then run up 114 along Cochetopa Creek back to US 50. The CRs are dirt, 114 is paved. This is another really fun ride!
Now, there are all the various passes in the area around Lake City, Silverton, Ouray, Telluride, etc,... they are ALL awesome! However, they are NOT all big bike friendly. In fact, I would not do some of them (Black Bear and Imogene) on big bikes if I had a choice. Engineer, Cinnamon, Owl Creek, Ophir, Bolam, Last Dollar Highway, and others on a big bike. Most of the rest in the area I would prefer to do on my KTM 530 EXC. I really like Scotch Creek Rd. It runs between Co 145 and US 550, starting just South of Rico on 145. It can be done on a big bike, but some parts are pretty technical because it is not a heavily traveled road. At the top, you come down the East side on Hermosa Park Rd., just like from Bolam Pass. All dirt.
Co 145 from Delores to Naturia is fantastic. Lizzard Head Pass is fun. All paved.
Co 62 between 145 and US 550 is pretty and fun. All paved.
CR 58p runs from 145 South of Placerville up to where Last Dollar Highway hits 58p and then continues up to Co 62. The South end, near Sawpit on 145 has some incredible switchbacks dropping you back down to 145. 58p and Last Dollar are all dirt.
Also near Sawpit, but on the South side of 145 is Falling Creek Rd. This runs down (up?) to Little Cone Rd. It runs West North of several big Mountains, including Delores Peak, to CR G49. Take CR 46M West to CR 49g. Follow 49g all the way down to CR 52. There is a crazy fun set of switchbacks right before you reach 52. Stay East on 52 and it will eventually become NF 611, which tees into CR 38 at the West Delores River. Follow that all the way back out to 145 North of Rico. It's all dirt, some of which can be challenging on a big bike. This is where my infamous upside down 1150 GS picture was taken...
Co 141 from Naturita, through Gateway, and back to US 50. AWESOME... Watch for loose horses and cattle. Be sure to stop and see the Hanging Flume.
In Grand Junction, I like to ride the Colorado National Monument. It is not about going fast (heavily patrolled), but about the spectacular scenery. Lunch in town at the Rockslide Brewery/Cafe.
US 550 between Montrose and Durango. It's the Million Dollar highway. It is simply incredible. Don't ride it if you have a fear of heights. I have seen it empty and packed. It is better empty, but ride with caution! The last time I was on it was in April of 2015 and it had slush on it. There were frozen water falls on the sides of the mountains. We went slow...
There are several cool dirt roads along US 550 that just go into the mountains a bit to mines and then come back to US 550. They are often really fun and you can walk right up to some of the mines. Just be aware that there are STILL nails on the ground in places and flats are not uncommon when you get around them. The same is true around any of the other zillion plus mines in this area!
That's about it for what I have ridden. The list of what I still WANT to ride is pretty long...
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Including I-70!
