Originally Posted by
Old Fat Guy
The OP said 7 speed, so not an issue at 126 spacing. If going to 130, yes definitely.
This is exactly what I've heard, too. The strength of the axle is more that adequate for 126 mm spacing, marginal at 130 mm. Shimano went to a three-bearing design (I think?) to support the axle. Campy followed suit as soon as they could.
Edit: Never mind, Post #15 has it right. It's improved bearing PLACEMENT, not the number of bearings.
Road Fan