Been bought a very expensive present I don't want and can't return

[Gresley]

After not speaking to me for 25 years, my sister has recently become very friendly with me again for no apparent reason, and for Christmas ordered me a new electric bike online. The parcel was gigantic so impossible to return. I didn't desperately want an electric bike and had said I would buy a secondhand one to see how I got on, but she sprang this surprise on me. Now that I've tried it I find I really can't get on with it (my arse was in agony) and don't want it. Should I (a) sell it? I've been offered just over a third of the original price by a local dealer;(b) give it to someone else? In both of those cases, should I (c) pretend I've still got it or be honest about getting rid of it, and even offer to pay back the money she paid for it? Or (d) keep it and leave it to rot in the shed and send her AI photos of all the lovely places I've been on it (not that I'd know how to use AI)? I think that If she knew I'd got rid of it she wouldn't speak to me for another 25 years.

it must have warranty that starts from
around now? You should sell it asap. It is worth more now than it will be by leaving it in your shed for 6 months.

could you talk to the shop it came from and get another product?

what shines through in your writing is that you don’t want it because it came from your sister. I say this because…. You wanted to try an electric bike and had the money saved but you can’t afford to buy a saddle and you are scared to cycle… even though you are an experienced cyclist.

right now the like is taking up space in your home and symbolically it is annoying you, so get rid of it.

I wear 3 pairs of knickers to pad my arse out. It worked well even when I was over 20 stone.....persevere with the bike. They're great fun, getting fitter is an added bonus.

You literally need to buy a gel saddle and get on with riding it.

I think that If she knew I'd got rid of it she wouldn't speak to me for another 25 years.

And from your point of view, would that be a good or a bad thing? 😀

Considering the speed with which many Mumsnetters usually yell "LTB" or "go NC" at the first hint of trouble in a relationship, not to mention the outrage at gifts deemed unsuitable on the Christmas threads, I'm surprised that there is not more understanding for the OP here. Just because a gift is expensive doesn't mean it has be received with gratitude, or that it is well intended.
My own toxic relative bought me a very expensive pram when I was pregnant with my first. No prior discussion, it just turned up on the doorstep. Everyone was wowed by how kind and generous she was. No, it would have been kind and generous if she had rung me and offered to make a contribution to whatever pram DH and I chose ourselves. I recognised this as the latest in a long line of attempts to control me, a prior notification that she was expecting a significant role in our child's life and something that would I be reminded of every time she wanted something from me for years to come. I didn't even like it. It was ugly, you needed an engineering degree to get it into the car and it just didn't suit my lifestyle. It was her taste, not mine. But it was expensive so I was supposed to be grateful. I allowed myself to be persuaded that it was a kind act, one that I would be a churlish bitch to refuse, she was just trying to nice, oh, and did I mention it was expensive?! But guess what? My first instincts were proved correct by time.
OK, I'm projecting here and the OP's sister may be nothing like my toxic relative. She might be a lovely woman who is just trying to make ammends in the best way she can for whatever the past problems have been. But maybe she isn't. I'd probably give the person who has known her for presumably the vast majority of her life the benefit of the doubt if she's feeling uncomfortable about the gift.

Take it to a bike shop for a proper bike fit, including getting a new saddle. It might make a world of difference

YABU for saying you had the money to get yourself an electric bike and felt patronised for the gift directly after saying you have precious little in savings and can’t go wasting a penny on a new saddle.

This has nothing to do with the bike or not getting in with it. You don’t want the connection to her, and that’s okay but be upfront with yourself and then perhaps her.

Why didn t she speak to you for 25 years and why did you do a go fund me?

Depends how much you value honesty in this relationship
seems that you find the gifts a bit’ingraciating’
is he issue that you don’t want to feel pressured into a closer relationship or that you don’t want to feel pressured into a gift reciprocal situation as a substitute for
closeness maybe rushing things a bit
she is probably reaching out in the only way she operates and maybe trying to buy your love you need to evaluate what you want from the u
and explain where you’re coming from can you put it in a local ad so you can ensure it goes to a good home I think you should separate the two issues
as once the first one is resolved you will know what to do with the second!