Originally Posted by QtoC

I rode from Quincy to Cambridge on my mountain bike over the weekend and it was easy. Basically just used used google maps bike directions.

I entered Boston via Granite Ave, which I think wasn't even mentioned in this thread yet. The only other alternative from Quincy is the Neponset River Bridge. The Adams street bridge is in Milton and doesn't make sense from Quincy given the other two options. Which bridge you take would depend on where in Quincy you live/work and traffic conditions.

Granite Ave could be dangerous during rush hour (40 mph speed limit, 3 highway ramps), in which case NPR bridge would be the better option. The side walk, which I think opened in 2012, is made for cycling.

Either way, you access the Neponset river trail easily - no cars there, very pleasant. You take that to Freeport St to Dorchester Ave to Columbia Rd to Massachusetts Ave. There are no steep hills save for the NPR bridge if you go that way. There is a clearly marked bike lane for the majority of the ride. Of course the traffic on Dot Ave and Mass Ave could be heavy, but I think an experienced cyclist could handle it easily. You would just have to stay alert and be aware. The biggest obstacle is double-parkers on Mass ave. They should all be jailed .

Also throughout this journey, you're mostly never more than a 5-10 minute walk from an MBTA station. If anything goes wrong you won't be stranded.