C cp128 New member Oct 29, 2009 #1 how many gears will my mountain bike have if the front has 3 cogs & the rear has 7 ?
K Kipper New member Oct 29, 2009 #2 They are all usable if the bike is used for Mountain biking and you have 21 gears but some of them will be duplicated as each chain ring (front cogs) has a cross over point. Hope that helps.
They are all usable if the bike is used for Mountain biking and you have 21 gears but some of them will be duplicated as each chain ring (front cogs) has a cross over point. Hope that helps.
B Bob A New member Oct 29, 2009 #3 3 X 7 = 21 But.. there are really only about 15 that are usable. http://bicycletutor.com/gear-shifting/
3 X 7 = 21 But.. there are really only about 15 that are usable. http://bicycletutor.com/gear-shifting/
