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Sorry, I've no idea what the difference is between the road and mtb versions of Chris King bottom brackets??!!
Are they interchangeable??
No as are road/mtb specific. They have it stamped on the b/b shell.
What makes them 'specific' then??
Surely an english threaded road BB can be used in a mountain bike (Shimano manage it).
From CK web site - though I thought it was the number of threads on the cup and not sure what dimension they mean by "width"
[i]Road and Mountain cups are almost always specific to discipline-specified crank systems. While the bearings are identical for both versions, the overall width of the cups is what designates use for a certain system. Cups are designated with two identifying marks per cup along with installation direction and torque values. There are, however, instances of compatibility where a "MTN" cup will be used for a "ROAD" crank. Please contact us or ask your favorite mechanic for advice. [/i]