gearing 2
ARob
Posts: 143
its a very simialar question to one asked recently so very sorry about that.
there must be a formula for gear ratios that says what size you need for a given cadence at a given speed but its beyond me to work it out!
the question however is, i have a 42/28 lowest gear. on the steep hills round here (20-25%) my cadence drops to around 50 which is hard going for me. Assuming the same speed what gear combo would give me a cadence of around 80-90? i only have 8 speeds on my bike so dont want to spread the rear ones out too much so i guess that means the back one would be around 26 or 28 so does that suggest a chain ring of 34 or 39 is needed at the front?
there must be a formula for gear ratios that says what size you need for a given cadence at a given speed but its beyond me to work it out!
the question however is, i have a 42/28 lowest gear. on the steep hills round here (20-25%) my cadence drops to around 50 which is hard going for me. Assuming the same speed what gear combo would give me a cadence of around 80-90? i only have 8 speeds on my bike so dont want to spread the rear ones out too much so i guess that means the back one would be around 26 or 28 so does that suggest a chain ring of 34 or 39 is needed at the front?
0
Comments
-
34 front ring is what you want for keeping your cadence up. especially on those hills.
26 on the back is sufficient, i wouldn't go for anything bigger really, unless you like to spin at around 200 rpm. lol.0 -
-
Try this site:
http://www.machinehead-software.co.uk/bike/gears/cyclists_cadence_calculator.html
For 34 front 28 back, with cadence 80 to 90 would give 7.61mph to 8.56 mph and if you can maintain that on 25% you need to enter the TDF
0 -
thats why i LOVE this forum - someone always has exactly the info you need
cheers guys![/url]0
