joesoap
Regular
- Location
- Preston, Lancashire
Sorry to be showing my ignorance here but my question is...How do you measure a bike frame? Between which two points do you measure to find the frame size in inches?
Frame size measurement
- Thread starter joesoap
- Start date
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mjr
Comfy armchair to one person & a plank to the next
- Location
- mostly Norfolk, sometimes Somerset
Not an ignorant question. You measure them however the manufacturer tells you and between whichever two points they say 
Traditionally, it used to be the length along the seat post from the top of the horizontal top-tube to the centre of the bottom bracket shell (which gave a rough rule-of-thumb of inside leg less 9 inches for an average size, varying a bit if you have short or long reach), but that's all gone to hell with sloping top tubes and strange tube shapes - see http://sheldonbrown.com/gloss_e-f.html#framesize
Traditionally, it used to be the length along the seat post from the top of the horizontal top-tube to the centre of the bottom bracket shell (which gave a rough rule-of-thumb of inside leg less 9 inches for an average size, varying a bit if you have short or long reach), but that's all gone to hell with sloping top tubes and strange tube shapes - see http://sheldonbrown.com/gloss_e-f.html#framesize
OP
OP
joesoap
Regular
- Location
- Preston, Lancashire
Ah! Right! Just checked my bike and the measurement from the centre of the bottom bracket to the top of the seat post is exactly the measurement as specified by the manufacturer.
Thank You.
Thank You.
D
Deleted member 1258
Guest
I tend to take more notice of the top tube than the seat tube these days, with modern bikes I'm more likely to get one that fits.
