dropouts & seat stay average widths

[oemodm]

Hello everyone,

I'm doing a bit of research on bicycle dimensions & hoping for some much needed help.

Maximum & minimum widths for:
A = Drop outs
B = Seat stay tubes at approximately their mid-point.
...for regular bicycles (mountain bikes, touring bikes, road bikes - under 600 - not specialist bikes).

For example:
Drop out max & min, 150 to 110mm
Seat stay tubes max & min 150 to 90mm

I know there is a huge amount of variety & I apologise for the vagueness of this post, however, as a non-cycling expert I'm looking for some guidance/sources to help define A & B maxs & mins

thanks so much

 

[Yellow Saddle]

Dimension A is defined by the type of bike.

The story is approximately thus:

120MM for single speed track/fixie bikes.
126mm for older road bikes with up to 8 gears
130mm for modern road bikes up to 11 gears
135mm for mountain bikes.
142mm for some newer mountain bikes
145mm for newer tandems.
150mm for downhill bikes.
No idea what for fat bikes.
160mm for some proprietary tandems.

Dimension B is a trigonometry problem. It is a function of A and the effective length of the seatstay.

 

[Dogtrousers]

Interesting reading for you here: http://sheldonbrown.com/frame-spacing.html

 

[oemodm]

thank you to you both.