Dogtrousers
Kilometre nibbler
I'd just chill out and concentrate on the things you can control, like not forgetting your phone/charger. have you got your Aunty Ethel's postal address to send her a postcard, lucky socks, re-reading through any info the organisers have supplied - like must-have kit, stuff like that.I am going to the store today and will check with them regarding the disparity in tyres. Will have to get the tube changed as well.
I weigh around 59 kg possibly slightly less now.
Yes i am also not sure about getting used to new type of tyres so late in the day ..when the ride is just 8 days away. I wont be riding a lot before the actual ride ... do get some rest... will do more of indoor cycling to keep the legs active.
You're fully supported - that should de-stress the ride a lot. Take advantage of that fact and have a great ride. If you can wangle a free tyre out of Decathlon - all well and good. If not, pfffft.
I did a bit of cycling in France last week and didn't get a single puncture, and nor did my wife. This is definitive proof that punctures are very rare in France.
Have a great time!