Originally Posted by
osco53
Every pound of rotational mass removed has the same effect as loosing TWO pounds of static weight on a two wheeled vehicle.
The Above would also apply to ounces I would think..
This is only true for accelerating and not for climbing (AND chains rotate a lot more slowly than wheels). And as big of a fan of MBB bikes as I am, I would use saved chain weight as a big factor.
No idlers is a big plus. And stiffer bottom bracket means less losses too.