New answers tagged single-speed
Single speed last longer and cost less. More metal and less (no) flex. SS comes in 1/8 and 3/32. I would contend a SS 3/32 of the same basic construction is stronger than a 3/32 7 speed because it does not need to be built to flex and it is not flexed. I am not finding any pictures of 3/32 SS chains and the chain on my SS bike is 1/8. So I guess it is ...
No problem at all. Single speed bikes with coaster brakes are very common in the Netherlands and a lot of them have child seats in some form or another. I use one myself and while one does feel the extra weight, especially on the odd incline, it's still very much ridable.
The fixed-gear generation having aged into parenthood, one sees such bikes commonly enough in Brooklyn. I just used a singlespeed for a short loaded tour because my touring bike is broken. It was fine.
It is unlikely that a four year old will slow you down much on a single speed. Just make sure you've got a well maintained front and rear brake. On the other hand, if you're thinking about making a purchase, consider the advantages of a bike that has a few gears, maybe seven or ten, etc, if you anticipate tackling a hill every now and then.
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