Join Date: Apr 2009
Location: Camp Hill, PA
Bikes: Too many to list here check my signature.
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Hello I am sure all us will have different opinions on this but here is mine. first of all (going a bit backwards) bike companies do realize that people come in different sizes that is why frames comes in different sizes. the frame is bought to fit your general proportions and then the seatpost and stem is adjusted to fine tune the fit.
seat post come in basically road 180mm to about 200 lengths and mountain about 350mm. generaly when adjusting a seat post only a few inches is needed if the frame size is correct. MTB seat post are longer because you need more stand over height but need to keep the seat to pedal distance.
quill stems pretty much can standard as to how much up and down adjustment, again if the frame fits only fine tuning is needed. as for the "reach" (lenght from 'quill' to the bars) this is proportional to size of the bike. and generally a -71d angle. mtb bikes again the reach being proportional but had a more positive angle to allow tou be in slightly more upright position. many companies made 'aftermarket' stems of varing heights and reaches the most comon being the tall Nitto 'technomic'
threadless stems again being proportional to the bike size also come in a wide variety of lenghts and angles. to adjust the fit. however unlike a quill stem gaining height with a threadless stem is dependant on the lenght of the steerer. that is whay most threadless bike seem to have an inch or more of spacers so you can finetune the height of the bars to some extent.
I hope this helps rather than adding further confusion.
Bianchis '87 Sport SX, '90 Proto, '90 Campione del Fausto Giamondi Specialisma Italiano Mundo, '91 Boarala 'cross, '93 Project 3, '86 Volpe, '97 Ti Megatube, , '90 something Vento 603,
Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '09 Motobecane SOLD, '?? Jane Doe (still on the drawing board), '90ish Haro Escape