Wold Ranger
Old School Grand Master
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Geometry
Maybe I understand this more than most, being from a precision engineering background. But castor and axle lead, both play an important role here too. The trouble is every damned fork has a different level of castor and axle reach, not to mention crown reach. It's the frame manufacturers that have the problems to solve.
This affects the handling dramatically. Some forks have no Castor, being parallel or in line with the headtube. others run forward to the axle at quite an angle. Fork crown profiles are widely different too. Some are angled well forward so the stanchion crowns are pitched in front of the crown race at varying degrees. Then there is axle lead, this varies from zero, and in the extreme 30mm plus. A ponderous steer effect is down to the axle being placed too far back, i.e. back nearer the crown, there is an optimum for each frame, accrding to head tube angle, so different forks will work better or worse. Interestingly enough fork manufacturers don't declare these numbers or adhere to a standard, which they should. Changing or upgrading a fork therefore, despite spending a fortune, can end up with a worse handling bike!
The whole subject is a can of worms.
Maybe I understand this more than most, being from a precision engineering background. But castor and axle lead, both play an important role here too. The trouble is every damned fork has a different level of castor and axle reach, not to mention crown reach. It's the frame manufacturers that have the problems to solve.
This affects the handling dramatically. Some forks have no Castor, being parallel or in line with the headtube. others run forward to the axle at quite an angle. Fork crown profiles are widely different too. Some are angled well forward so the stanchion crowns are pitched in front of the crown race at varying degrees. Then there is axle lead, this varies from zero, and in the extreme 30mm plus. A ponderous steer effect is down to the axle being placed too far back, i.e. back nearer the crown, there is an optimum for each frame, accrding to head tube angle, so different forks will work better or worse. Interestingly enough fork manufacturers don't declare these numbers or adhere to a standard, which they should. Changing or upgrading a fork therefore, despite spending a fortune, can end up with a worse handling bike!
The whole subject is a can of worms.