I tried to join in with this last year, but injury got in the way, and I ended up with just over 1000km. Going to try again this year, as I'm planning to run an Autumn marathon, and need to be logging the KMs regularly. Going well so far - 113km completed so far, so 1903 to go.
On this day in 1903 (well, actually yesterday, but didn't get round to posting it then!) the first west–east transatlantic radio broadcast was made from the United States to England.
Re the solid tyres, one of the reviews they quote on their site (so, presumably they're happy that it's fair) includes that they weighed a set of Brompton tubes and tyres and found that the solid tyres weighed "only a few hundred grams more". Bearing in mind that's for 16" tyres, in an application where weight is hardly the most important factor, the weight penalty for a road bike tyre may well be significant.
Wasn't going to reply, but hey ho. I didn't mean to cause any offence. The suggestion for an extra magnet on additional wheels was helpful. Interesting opinion on putting one on each bike. I guess it comes down to how much disposable income you have as to whether they're cheap enough to put one on each bike. Personally I don't think they are (unless you know of a super cheap place to buy them). As I said whatever works for you. TBH I found the last reply, with the concocted situation that might leave me cursing not having bought one for each bike, frankly rather bizarre, especially when I'd already said I'd rather spend the money on something else, instead of buying duplicate kit. It is, after all, a piece of equipment that is designed to be moved between bikes. I was going to reply to that but thought the cartoon said it better.