tomasojohansson skrev:
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> Om inte 30-talsgafflarna flexade i potthålen...
> De var ju böjda nästan i 90 grader, i vanligt
> järn.
Det har genom åren funnits många olika gaffelkonstruktioner, det var därför jag skrev
> Böjen i en korrekt dimensionerad, traditionell gaffel flexar inte.
Denna gaffelflexdiskussion var het för några år sedan när raka gafflar blev moderna.
Det var många som då lät sig luras av utseendet, men de som inte vill låta sig lurasa av en 'synvilla' testade.
Jag har sparat följande inlägg från ett annat Forum:
"measuring fork flex under loading shows that forks don't flex much at all at the tips, they
flex at the steerer. Try it yourself -- tape a piece of string
to your fork at the tip and just above the end of the curl, put
your weight on the handlebars, and see if the string goes limp."
och
"Y'know, that always did sound a bit fishy but it SEEMED like a plausible explanation. So I
pulled out an old raked cro-mo fork and a spare hub and skewer and tried an
experiment. I clamped it the assemble forks-up in a heavy vice, then (only
high-tech methods used here) suspended a basket to the hub and adjusted the
fork so the rope ran nearly parallel to the steerer tube (applying force in
the intended direction). I set up a guage to mark the original position of
the fork, then began adding weight to the basket. At 220 lbs (all the
calibrated weights readily available) the total fork deflection from it's
unloaded position was under 1 cm. The vast majority of that occured during
the first hundred pounds of loading, and I suspect was flex at the steerer
(using the suggestion above I taped a piece of tring across the raked portion
of the fork, and saw VERY little deflection in that region).
Conclusion: under normal loading a raked fork does NOT show sufficient
deflection, particularly in the curved portion to warrent to hypothetical
"shock absorbtion" benefits I mentioned in my earlier post."
Välj själv, vad tror du helst på verkligheten eller en 'synvilla'?
/Håkan
