Originally Posted by
dwmckee
Does anyone know if the Shimano 10 speed road and MTB cassettes have the same sprocket spacing? I know the shifters and derailleurs are not interchangeable between road and MTB, but are the cassettes?
From 6 to 10 speeds, MTB and road cassette is just a marketing term, explaining intended use (influences sprocket teeth number range - MTB ones usually go to as high as 36 teeth). They are 100% compatible. Wrote in detail here, what goes with what (pitch, spacing, sprocket thickness, compatibility):
2) Bicycle cassette compatibility - Cycle Gremlin