Measure and draw a triangle. Height is from BB to chainring, base is axis to end of chainring. Now add 2,5mm to the height, base should grow exponentially if you keep the same angles. Now calculate how much a bigger chainring measures. Or just trial and error, 46t is big enough for anyone but racers anyways.
Measure and draw a triangle. Height is from BB to chainring, base is axis to end of chainring. Now add 2,5mm to the height, base should grow exponentially if you keep the same angles. Now calculate how much a bigger chainring measures. Or just trial and error, 46t is big enough for anyone but racers anyways.