Regarding the topic - three new 10 speed chains (on sale) and a new middle chainring. Third middle chainring this year. Apparently we use that one most... I am hoping that we don't need a new cassette yet since we replaced it just a couple of months ago. I am thinking that with this will make it through our training and the 300, 400 and 600 before I will need to replace everything, just before the 1000k. By the way the single speed timing chain that I am using is holding up very well. Chain looks good, chainrings look good. Well worth the few extra grams as far as I am concerned. Probably won't replace it until the 1000.

Regarding the Dinotte light. It is very bright and when there is no ambient light it messes with your night vision. Probably not a big deal for most tandems, but something to consider if you do a lot of night group riding. One thing I think you should consider, is that it is possible to have too bright a light. (I am not saying that the Dinotte it too bright, I don't own one but I am considering purchasing one.) This is based upon a DOT or CalTrans study and a discussion about this with a friend of mine who works in traffic often and gets alerts/memos from his company about safety in construction zones. Basically the deal is that if you have a light that is distracting and causes the driver to focus on the light rather than the road, the driver, especially if impaired (drunk or stoned), is more likely to drive into the light rather than avoid it. Unfortunately, the light that alerts a typical driver to your location from a long distance can also be the one that will attract the drunk driver to plow into you - like a moth to a flame. If I owned a Dinotte I would set it to non-flash to not be so distracting. This is the same way I ride with my two Planet Bike Super Flashes when we ride at night. Your results may vary. Stay safe.