Ultegra 6503

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As you can imagine, the entire bunch disappeared behind the next turn, leaving me cursing and subsequently chasing back. This Spring, trying to upshift for the first time this season, the chain fell off but the strong push of the deraileur somehow forced the chain between the largest cog of the cassette and the spokes. What other differences are there? Will They notice any difference between the 105 and dura ace bottom bracket? Should They spend the extra money on dura ace?. Ultegra 6503 3X 9sp crank, OL5-165mm Model 6503 Hollowtech triple crankset with ringsOL5: Shimano Octalink 5mm deep 8-spline spin. Similar Products Used:. They need a new bottom bracket to replace the ultegra 6503 for the triple crankset that They currently have. Since the dura ace cannot be had in the triple. suggest you go to ebay and search road bike bb,s.