The point about available room is a good one, but a monoshock has one definite advantage: It's easier to tune.
Many monoshocks are fitted with variable linkages, so that effective spring rate and damping can be increased or decreased as the suspension moves off "neutral" position. As I type this, I can't think of any dual shock setups I've seen that incorporate variable linkage (OK here comes the onslaught of counterexamples - have at me, folks) unless you count the variable attachment point used by Velocette about 40 years ago.
Of course, variable rate springs and very fancy valving in the damper units could do everything a variable linkage accomplishes, but it would surely be more expensive to manufacture. Not only that, but a suspension tuner can surely (within limits) fab and install new rods and linkage parts to change the geometry with straightforward and readily available machine shop facilities. And the manufacturer can fine tune the linkage during final product development without upsetting the whole production operation.
Many monoshocks are fitted with variable linkages, so that effective spring rate and damping can be increased or decreased as the suspension moves off "neutral" position. As I type this, I can't think of any dual shock setups I've seen that incorporate variable linkage (OK here comes the onslaught of counterexamples - have at me, folks) unless you count the variable attachment point used by Velocette about 40 years ago.
Of course, variable rate springs and very fancy valving in the damper units could do everything a variable linkage accomplishes, but it would surely be more expensive to manufacture. Not only that, but a suspension tuner can surely (within limits) fab and install new rods and linkage parts to change the geometry with straightforward and readily available machine shop facilities. And the manufacturer can fine tune the linkage during final product development without upsetting the whole production operation.
