[DanEC]

Ralphy has a good point in that a larger dia MC has more displacement for a given stroke as a smaller dia MC. So you can probably get by with a little less stroke on a 1 inch MC.

I think (a dangerous proposition for me) that for a muti-piston brake, you have to look at the total surface area of all of the pistons together to evaluate the resultant MC piston diameter that would be most appropriate and pedal effort (along with the pedal ratio as Rick Parker pointed out).

The 1 inch MC will increase pedal pressure over a 3/4 inch MC and that may require a little tuning of the front/rear balance. I don't know if it will be a great deal of difference since the front is remaining a 3/4 inch. I think you can roughly approximate it by looking at a ratio of the before and after MC piston area. Before - two 3/4 inch MC have .883 inches of combined piston area and 1-3/4 inch MC and 1-1 inch MC have 1.227 inches of combined piston area - a 39% increase which should relate to a similar pedal pressure increase given a constant pedal ratio. But the net result will depend on how your front to rear balance is set.

Something Bob at ERA pointed out the other day - with new brake pads, the pedal will seem a little soft until the pad surfaces get fully bedded in and conformed to the discs.