Globalti said:
Anything that then breaks while on the road is beyond their control and likely to be irreparable by the roadside.
And what goes out of adjustment on a bike that can't be re-adjusted without the need for tools?
Case 1: I was in a group of about 30 riders on the Costa Blanca. We had just hit a small hill and were starting to power our way up it when we heard a loud noise and a stream of expletives coming from the back of the group. A rider had just tried to change gear and his gear hanger had broken, sending his rear mech into the wheel. Several spokes were broken, his mech was hanging down into the wheel and the chain was mangled. We were about 30 miles from our hotel, in the middle of nowhere.
Between us, we managed to take off his rear mech, shorten the damaged section of chain and turn his bike into a singlespeed for the ride back, and straighten his rear wheel enough to make it rideable with the back brake slackened off.
Case 2: The one where a mate of mine decided to test the impact resistance of a dry stone wall with his head after spending too much time enjoying the scenery on a fast descent at Bowland Knotts! His front wheel was completely mangled but he managed to straighten it enough to ride 20 miles back to his car.
All the necessary tools (allen keys, spoke keys, chain tool) were available on one multitool. I always carry one, as well as two tubes, a puncture kit, a pump, some duct tape, a length of chain, some powerlinks and a few other bits and pieces.
I don't have a partner with access to a car and I don't intend bothering my friends who do drive if I have a problem when I'm out on my bike. I can't afford long-distance taxi or rail fares if my bike is broken, so I make damn sure that I can fix most things if I have to. I've always managed to get home under my own steam in over 100,000 km of cycling.