Those fake bike-like devices that some stores (such as Prov Bike)
have, with a flyweight in the back, are adjustable along numerous
parameters. A qualified tech puts you on it and then determines your
This lets them make suggestions such as what height the seat-post
should be, what length of cranks to use, etc.
The process costs $100-150, and often a store will deduct that cost if
you then buy the bike from them. (This used to be the policy at Prov
Bike; I don't know whether it still is.) That way, if you know you're
definitely going to buy a bike and have picked out a store that has
all the options you're looking at, you can get the fit-kit for
effectively no cost.
To some extent this is more fuss than strictly necessary. On the
other hand, if you *do* have a store picked out and they are equipped
to do this, no harm done -- it'll only take a bit of your time -- and
you may discover surprising data. Especially if you are going to be
riding more with the new bike, it can help you tune in your bike
position and thus save you some aches and pains (and perhaps worse).
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