Couple of reasons. One, I was getting five bikes and since I am the only mechanic at the house it makes it easier to keep all in shape if they are identical. I liked the looks of the D9 better. The price was $250 less ($750 vs. $1,000).

I think they both ride great, but identical. The D10 was a great deal at $1,000 as they are normally $1,400, but I still couldn't see spending more for an almost identical bike.

Were you trying to decide between these two?

I'm going to switch to Schwalbe Marathons on mine as I don't care for the Mezzo/Kendas. My rear has a hop to it and it produces a bounce. Also, the seat are not very comfortable. I already switched to SPDs.

The other four bikes will stay stock, except for the seats.

BTW- told a friend about thr D10 and he went down that day and bought it! That gets me to 29 bikes that I have bought from my LBS or caused to be bought!