I'm wanting to try the new 26in. rear wheel, 29in. front wheel set up. My current setup has a front fork with a 430mm a2c length with included fork sag. I want to go to a rigid front end and have found a 700c cyclocross fork with a 400mm a2c. I understand that the rough difference between a 26in. and 29in. wheel is approx. 30mm. So, am I correct to say that 400mm (fork length) + 30mm (wheel difference) = 430mm a2c? Thanks.