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DA vs Ultegra crankset(3 posts)

DA vs Ultegra cranksetPeterRider
Sep 13, 2003 8:58 PM
Are the rings used for the DA crankset made of the same alloy as the ones for the Ultegra ? If not, what is the difference ? And also, are they interchangeable ? (my understanding is that only the middle ring is different for a triple, 42 for Ultegra vs 39 for DA).

Thanks !

re: DA vs Ultegra cranksetRusty Coggs
Sep 14, 2003 5:50 AM
DA triple middle ring only works on the DA triple crank,and the granny ring bolts to the middle ring,rather than to bosses cast into the crank spider.
re: DA vs Ultegra cranksetLone Gunman
Sep 14, 2003 2:26 PM
Probably the DA is lighter, can't remember where I read this but the Ultegra was supposed to be stiffer than DA, stiffer in the sense that a machine can measure deflection, the human will not feel the deflection. As far as rings go, to tell for certain check the bolt pattern measurements I think they are 130mm. Durability? I think 12K or better is a reasonable expectation if you maintain your chain. For an alternative crank than Shimano with lots of ring choices and the same shift performance, check out TA Specialties from Peter White Correct about the triple Ultegra vs DA ring; Just went through that and put a TA Specialties 39t on my Ultegra triple crank, works very well, it is ramped and pinned.