Yesterday me and my son got out for a great ride. I just got him an 06 250x. What I really like about his bike was the gearing, especially the engine braking on steep down hills. We do a lot of that where we ride. The stock gearing for this 250x is 14/53. This is where I'm confused. My 07 wr450 is 13/50. It's not even close when coming down a steep hill. I use a lot more brakes on my WR then that Honda. Going by those number the WR should have more engine breaking. They are obviously two different bikes and maybe that's the reason. Another question I have is I want to go to a 52T in my rear. I think this would be ideal for what I ride. Can I use the stock chain? I heard if it does fit you have a shorter wheelbase and it a wheely machine. Maybe a new chain and sprocket Is required.