Originally Posted by
mstateglfr
I have spd a600 pedals on a road bike that weigh less than spd SL 105 road pedals.
...less or same, don't remember, it's been 6 years.
Anyways, there is a possible exception to the rule, for what it's worth. The pedal that replaced mine weighs basically the same too, so it's still possible to buy a Shimano brand spd that's light.
Then there are the titanium spindle light spd options, but in ever looked into em too much.
I'm sure it's possible to come up with a road setup that's heavier than a MTB setup. In reference to pros' reasons for using road pedals/shoes, it's usually about weight. Remember, the weight of the shoes is also part of the equation, not just the pedals.