- United Kingdom
Reading your post you have identified the times the chain pops off exactly as it happened to me. Unfortunately this doesn't explain why this only happens to some of us and not others. My LBS has identified the problem and emailed Specialized but has not had any response.I continue to have the same issue with the chain coming off. I put about 6,600 miles on the 2022 Vado 5.0 in 16 months, replaced the chain every 1500-2000 miles, new cassette at the same time and it eventually happens, many, many times. Discussed it with the local bike shop Guru, and he experienced same issue with his Vado when he had one. His opinion makes sense. He, like I, do a lot of upshiting and downshifting and when coming to a stop and downshifting and upon eventually stopping, it's like the internals of the motor are still slightly spinning and that ever so slowly puts the chainring out of sync with the chain. You should notice that it is usually when starting from a dead stop, and had just downshifted prior to stopping. Upon stating off again, the chain is popped off of the chainring. Seems like a common problem with a lot of solutions. I may consider the Garbaruk chainring next time. I always use the KMC e11 chain, and I always wax the chains (hot wax dip).
To reinforce what you are saying, i have a narrow/wide chainring replacing the OEM wave. When starting off sometimes there is definitely a clank sound which i think is the wide tooth gripping the chain and locking it on to the chainring.
Just my theory