R20/SXRF 8 speed Gearing Question
I'm considering upgrading the BB and cranks on my R20 and would like to know how reasonably small a chain ring I can use. I have bad knees, like to spin uphill (actually all the time) and find a bit lower gear would benefit me greatly. I have the 305% XRF8 hub and never use 8th gear and only occasionally 7th. Will a 42 or 44 tooth ring be enough of a change or will it throw off the entire ratio through the rest of the gears? I purchased a UN72 73 X 113 BB and will probably go with the Phil rings when I have the time and cash to do the rest. Also, any crank recommendations? Thanks for any advice. I'm looking forward to getting back on the bike after a long winter of eating.