Our expert says:
I think that you can do it, provided you can go in with lowered expectations. This might mean that you have to back a few groups down - there can be nothing worse than being dropped off from your seeding group early on in a ride and having to slog the rest of the way on your own or in a very small group. The thing about cycling is that you can afford to ride above your training distance. As you have then experienced, you can do a ride of about 55 km on no training, and so you can do a 70 km ride on very little training. It might take some suffering and patience and a lot of self control, because you can't just launch into it like normal, but if you can control your eagerness, then you can certainly go for it!
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