Mike_GMT80 wrote: I agree to a certain extent but given that I reckon 95% of bikes sold (especially at the price point I am looking at) are to people who don’t even know what a crank is I don’t think it’s a massive issue. According to stava I’ve done about 330 miles in a month on my bro’s old bike which has been dumped in my garage for the last 7 years. Don’t have a clue of frame size, crank, etc. Just dusted it off and started riding...Been totally fine. Now it may be that I’m been lucky and his bike is perfect for me, but it may also be that given I’m not doing 4 hour time trails the less than optimum sizing isn’t and issue. I’m definitely all about detail, just in this instance don’t think it’ll impact much for my intended use.
It doesn't need to be a time trial. You can damage your knees whilst leisure riding. But having said that about 90% of males are OK with 170mm cranks. 5% could use a longer crank. 5% of males and 50% of women really need a shorter crank. So at your height you're within the main male range. BTW you may well find your "intended use" changes quicker than you'd think. Back in the midsts of time I bought a bike to get a bit of exercise but it quickly escalated into riding with a club, cycle touring around with all my camping gear and doing 200K audaxes. Once you get the cycling bug you're well and truly bitten