Originally Posted by
Dee Hubbs
Yes they are compatible. But:
MT-200 series use the BH59 brake hose, and any XT will use the newer higher pressure BH90 hose.
You will see some improvement with the new XT levers, old BH59 hose and old MT200 calipers.
You will see a better improvement with new XT levers, new BH90 hose and old MT200 calipers.
The BH90 is the same external size as BH59, but with a smaller internal diameter on the BH90. This means the BH90 outer casing is thicker and does not deform under hydraulic pressure. The olives are the same size, but the internal barb are different sizes.