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Old 07-08-21, 07:48 AM
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Joint Venture, thanks for the reply. I did email Todd, but have not heard back. So, I cut a hole in a piece of paper and then cut across the center of the hole. I put that on the spline drive shaft and used it to accurately measure the lockring diameter. It's 46 mm. So, the Park Tool HCW-5 Bicycle Bottom Bracket Lockring Wrench should work to remove the lockring. I have one coming. Two things I have learned from this process. 1) All those folks on this forum who advocate changing all the chainrings from time to time don't ride daVinci tandems 2) It's worthwhile to keep a backup tandem if you can do so. We ride every day and would really be unhappy if we were without a tandem to ride during all this down time with our Grand Junction.

Last edited by jethro00; 07-08-21 at 11:34 AM.
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