Brompton owners

So...about to dip my toes into the folding world.

Planning on M2L

M - bit more sit up and beg for the missus and can have the front basket
2 - -7% option, 69gi for normal use and an uphill gear

69gi is a lot more tiring on a brompton than it is on a normal bike if you're doing more than a couple of miles.

I have s3 with +8% gearing which gives 69GI in middle gear and i definitely feel it in my legs more than riding my old fixed.