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I am looking for some new cross forks and have become confused by this picture on the BikeCad site:
http://www.bikecad.ca/taxonomy/term/52
I always thought axle-crown was what they show as 'fork length', i.e. the measurement in line with the steerer rather than the direct measurement along the hypotenuse.
Does anyone know which is the one quoted by manufacturers?
If it's the 'fork length', does anyone know of a foolproof method for measuring it?
TIA
Interesting. I'd have thought that with any set of "modern" forks I've seen the difference would be so negligible that it could be ignored.
Well, you say that but quoted lengths seem to fall between 390 and 405, which (IIRC) equates to nearly 1 degree on the head angle?
Plus I have no clue which measurement to use on my current forks...
Remember that there are variances in things like the headset "lower" stack height too.
Yup, aware of that
Interesting. I'd have thought that with any set of "modern" forks I've seen the difference would be so negligible that it could be ignored.
Well, you say that but quoted lengths seem to fall between 390 and 405, which (IIRC) equates to nearly 1 degree on the head angle?
What Scotroutes is saying is the difference between axle-crown and fork length according to that drawing is not much at all.
A difference of 15mm to either measurement will make a difference in head angle, but you wont have say fork length of 390 & axle-crown of 405 - the offset would be huge (simple trig), it would be more like fork length 390 & axle-crown 392.
If one manufacturer is quoting a fork length and another is quoting A-C, then I'd take them as directly comparable for the sake of the tiny difference in the way it's measured.
Thank you cp - that's exactly what I was getting at. I should really have been clearer 😳
Ah, thanks, hadn't occurred to me to throw sums at the problem 😉
I've just sketched it up - the difference would be almost exactly 2mm 🙂
Embarrassed 'ta' 😉