To feel like I shouldn't have to 'support' someone who just can't be arsed!

[Snowfire]

I'm going to take part in a big cycle ride next weekend with a group of friends. I've been working up to it for a long time and have done regular training rides plus raising money for charity. One of the group has hardly done anything. She's talked a lot about how it's going to be such a huge challenge and it will be such a great achievement when it's over but has barely ridden her (brand new) bicycle.
As a group, we have got together a few times recently to get some bigger milages in and generally support each other and discuss tactics but she always has something else planned. The ride itself isn't a race but it is timed and there's a cut off time due to road closures etc and I would be gutted if I didn't finish!
Yesterday she was saying how she has been worrying it's going to be really tough but she knows we're there to support her... I didn't comment but to be honest, I don't think her lack of training should mean I might not finish.

I think go at your own speed - if dhe can't keep up she'll have to drop out or cycle alone. It's her own fault for not putting in the training. I would feelmore inclined to go at a slower pace for a committed friend who was just less able.

Go at your own pace. You've put so much effort in you deserve the rewards.

I agree, you deserve to be proud of your achievements.
Maybe set up ahead of her so sadly you can't see her dropping behind...

She may well make an excuse on the day to get herself off the hook. I think I might say 'I might be ahead of you, I might be behind you, but I will be with you in spirit, I hope you have a good ride on the day'. And try to have a conversation with the others about strategy - without committing yourself to riding as a group, in case they want to go at slowest members pace. Otherwise it might be embarrassing if you go haring off and then something delays you and they overtake.