Well I wasted a day going to
Decathlon in Reading today.
Basically they said they would prepare the Medium, I got to the store and apparently it was missing a brake cable or something like that so they wouldn't let me try it. Apparently the French guy who answered the phone had taken down my number wrong.
So I tried sitting on the Medium, but they wouldn't let me ride it because it had the missing brake cable. Then he said 'I think you actually need the Large', so I brought the large out of my car, but the seat post bolt had gone missing somewhere between home and Reading, so he lent me a bolt. And they wouldn't take my bike in for exchange I have to post it back if I want to exchange, because it had come from mail order, or come back to the store when they had a working Medium bike to try that. But he said 'why don't you try the large for a proper long ride, and then if it's not right or hurts, you can change it'.
Anyway I said 'the gears on my Large are bad, can you adjust them'. So he did while I went out to my car to look for the bolt. Came back and he was finished and removing his seat post bolt. He said 'they never do the gears properly in the mail order'. He then said 'You might find there is some chain rub because this is a double chainset but triple shifters'. I said 'so if they are in big chain front, big chain back, they will rub, but if it's not cross-chained it will be ok;. He said 'yes'.
So drove back home, put the bike back together, went out to ride it.
He had done nothing.....
Basically it's impossible to shift into the big ring at the front, and on the cassette at the back only the bigger rings work without rubbing.
So I gave up, because riding it is a waste of time.
Guess I need to find a proper bike shop to adjust the thing.