An 8" collapsible dob (eg.Skywatcher) is not something I would like to carry on a motorbike. A small trailer for the bike, like one of the camping trailers, would be an option. A 4" mak is still a fair weight to carry in a backpack on a bike. My "authority" for the opinions: I own an 8" collapsible and a 4" mak and ride a bike, but also have the luxury of a car to carry them around.
Good luck in your search for a solution.
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