[Racerbvd]

Originally Posted by look 171

What's the advantage of doing it that way beside weight and rolling resistance?

Non really, they stopped making the BMX version after a few years as they broke, but that was late 80s, early 90s. The Cannondale Lefty been around a bit now, so they at least have it figured out (their propaganda below)



Innovation - LEFTY

SUPERIOR PERFORMANCE THROUGH UNCONVENTIONAL DESIGN.

The LIGHTER-STIFFER-STRONGER-SMOOTHER front suspension -
Now with SEALED HYBRID NEEDLE BEARING TECHNOLOGY


LIGHTER
Lefty's minimalist single-leg design lets it be lighter than most competitors’ lightest XC race forks.

STRONGER
Lefty's dual crowns and oversize inverted structure give it such strength that even the lightest Lefty can out-perform burly all-mountain forks in destructive testing.

STIFFER
Lefty’s stout structure, combined with its "square-in-a square"stanchion design and lower glide bearing make it torsionally stiffer than any fork in the world, for pinpoint steering precision.

SMOOTHER
The heart of the Lefty, Cannondale’s patented hybrid needle-bearing technology keeps the suspension moving freely, regardless of load. Even under the hardest braking, impact, and steering forces, the wheel is able to track the ground fluidly for maximum control.

WORRY-FREE
The new hybrid design allows the entire fork structure to be completely sealed against the elements for long service life and features auto-resetting needle bearings to eliminate the need for regular manual resets.

KEY LEFTY TECHNOLOGY




DUAL CROWN INVERTED DESIGN
With the larger, stiffer fork tube on top where it can more effectively fight flex and add strength, and dual crowns connecting it solidly to the headtube, the Lefty's unconventional design is simply the lightest, stiffest, strongest way to build a fork.



SQUARE-IN-SQUARE DESIGN
The needle bearing races form a square-in-square interface between the inner and outer fork legs, preventing the two tubes from rotating relative to each other like the round-in-round design of traditional forks. Contributes to Lefty’s incredibly stiff and precise handling.




HYBRID NEEDLE BEARING SYSTEM
Friction-free needle bearings provide unmatchably smooth suspension under all loads, while the lower glide bearing provides additional support for improved stiffness and steering precision as the fork moves through its travel.



DURATHON SEALING SYSTEM
A comprehensive internal and external sealing system keeps the good stuff in and the bad stuff out, allowing for more than double the time between recommended services than our competition.