Hi Bill, welcome to the forum & thank you for sharing info with us. 
How about updating your profile and let us know whereabouts in the world you are.
As regards a motorcycle mount for the Colorado, found this website last week, you might want to take a look. Its a specific m/c mount for the Colorado.
Web Link: RAM Mount Aluminum Garmin Colorado Series Stainless Steel U-Bolt Motorcycle Mount, P/N: RAM-B-149-GA27U - GPS City
Cheers
John
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BMW R1150GS
KTM 525 EXC
Garmin Zumo 550 + SanDisk 4GB SD-HC
Garmin Colorado 300 + 4GB-SD-HC & Garmin Etrex Handheld
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"Only a biker knows why a dog sticks his head out of a car window"
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