Because children outgrow their first bicycles so fast it can be quite a challenge and expense to keep them fitted... we receive so many kids bikes as donations at our co-op and most are in wonderful shape.

We almost give them away after we make sure they are OK.

A 6 year old should be able to ride a fair distance and if they enjoy riding they will do it all day... my twin nieces were riding 10 miles round trip at that age and this involved some serious hill climbing too.

My daughters were doing 18 miles round trips by the time they were 7.