Reports of Shimano Ultegra and Dura-Ace cranks falling apart, or in Shimano speak “bonding separation issue”, have been floating around for several years. Up until this point, AFAIK, they have been completely silent on the issue and left it up to owners to bear the cost for replacement, and pain if something goes catastrophically wrong…They’ve finally come to their senses on this, so kudos? If you have an ULTEGRA FC-6800, FC-R8000 and DURA-ACE FC-9000, FC-R9100 or FC-R9100-P crank, you’re going to want to check the production code to see if it’s in the danger group.
- A production code is stamped on the inside of the crank arm near the bottom of the arm. The affected models are pre-July 2019 production and have the following two-letter production code on backside of the crank arm where the pedals are attached: KF, KG, KH, KI, KJ, KK, KL, LA, LB, LC, LD, LE, LF, LG, LH, LI, LJ, LK, LL, MA, MB, MC, MD, ME, MF, MG, MH, MI, MJ, MK, ML, NA, NB, NC, ND, NE, NF, NG, NH, NI, NJ, NK, NL, OA, OB, OC, OD, OE, OF, OG, OH, OI, OJ, OK, OL, PA, PB, PC, PD, PE, PF, PG, PH, PI, PJ, PK, PL, QA, QB, QC, QD, QE, QF, QG, QH, QI, QJ, QK, QL, RA, RB, RC, RD, RE, and RF. Please proceed to Step 2 if your crank has this code. If your crankset does not have one of these codes, please proceed to step 3.
- If you have noticed any changes in the feeling of the crank when you pedal or hear noise or creaking, please proceed to Step 2.
- Consumers who believe they have an applicable product or are unsure how to check the manufacturing code are asked to contact an authorized Shimano retailer to schedule a free crankset inspection. Please see below for instructions on how to figure that out. You may also call us at (844) 776-0315 for assistance.