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It still take you longer to slow down.
Basic principle.
You don't know how to skid effectively by the sound of it.
Slowing down to a stop from 25mph just by resisting the pedals is a slow process and it is quicker to do more abrupt skids. Knowing how to skid effectively is part of it, i.e. don't take all the weight off the rear wheel and slide down the road for 100 metres
Even off road I can still stop quickly by using effective skidding.
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Or just work it out using online calc or this which is good enough;
42/16 * 27 = 70.875
42/15 * 27 = 75.6
44/16 * 27 = 74.25Going to 74 or 75 from 70 will be pretty noticeable. And while fine tuning is easier done via chain rings it can be more expensive and more difficult to find chain rings in un-common sizes, i.e. 43 to get an in between gear in examples above.
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Only segments I can get in the top ten on are uphill off road (which proves my choice of a 25c tyred fixed gear track bike off road is not a bad one for uphill speed!).
I did make myself feel better by going premium for a month to see what the other OAPs like myself are up to.
Biggest annoyance at the moment is my iPhone is losing some of the segment and then it doesn't count as it has deviated from route too much.
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You are pretty much the same size as I am (same height, same inside leg etc,.) and looking at the geometry chart I would pick the 54. This is because the top tube length is good for me and the head tube length is large enough to put bars at right height.
I could ride the 56 but would need a very short stem which sort of means it is not perfect fit but would still be completely rideable.
Don't worry about the set tube length, that is irrelevant. -
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Is driving harder than it was, less enjoyable, slower, more expensive?
It is probably easier as the cars tend to just work these days and are generally easier to drive (better brakes, power steering, air con etc,.)
It is much less enjoyable than it was 25 years ago to the point where I have gone from owning cars that were made for speed and handling to a car that is make for economy as there is no point having a car whose capabilities you can never use
It is a lot slower as much more traffic than 25 years ago
It is probably cheaper for me as I am older so insurance is cheap, cars are more economical for same type of car and petrol was never cheap even 25 years ago.