Quote:
Originally Posted by Darren69
......From the fork flexing prospective regarding mudguard stay mid pipe twanging it may be preferable to have the calipers on the rear so if there is flex then the forks flex outwards?
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Not sure that they would flex outwards in either position?
There are two types of flexing from the braking.
If the brakes are mounted on both fork legs the braking force tries to bend the bottom of the forks back towards the engine, but the Caliper/drum tries to pull them forwards, a balanced couple that gives a bending moment: how big a bending moment, and how big the deflection depending on how good the brakes are versus how stiff the forks are.
With single sided disk or drum where all of the braking force is put into one fork leg, only that fork leg tries to move back towards the engine. So far as the front wheel is concerned, it doesn’t know the handlebars haven’t turned but only that the fork bottoms have. Same effect as a sharp pull back on the left handlebar to turn right!
How dramatic this is in the real world depends hugely on how stiff the forks are, plus how rigid the front axle and its mounts are, plus how well the front mudguard and fork brace keep the fork legs parallel.
Experience of small 70s trailies with spindly fork legs and the low factory mudguard and its bracing completely absent is not easily forgotten!
