I Do you know the diameters of 11t and 28t? Dont want to order everything then find out it doesnt clear.
Quote from: 87master on August 27, 2009, 08:08:33 PMI Do you know the diameters of 11t and 28t? Dont want to order everything then find out it doesnt clear. to find diameter you need to use some of your 8th grade geometry. C = pi(3.14) x Dso knowing the distance from each chain link bar is .5 in your circumfrence for the 11t is 5.5 and for the 28t is 14so then just plug it into the formula as 5.5 = 3.14 x D 5.5/3.14 = 1.75 11t diameter is 1.7514 = 3.14 x D 14/3.14 = 4.46 28t diameter is 4.46this diameter is from the middle of the chain posts so it might be bigger by about 1/8" to 1/16" with your chain onand if used together the ratio for 28/11 is 2.54compared to your current ratio 40/16 is 2.5these two set-ups are going to feel the same
ah, forgot, micro-gearing is everything with sprockets smaller than 23T as far as I know. for 22T and less you need a micro-drive compatible crank or a spline-drive sprocket and a profile-style axle
crank arm leingth also plays a roll in this scenereo.if you run 175mm arms on a standard 44/16 gear ratiothat is "normal bmx feeling" when pedaling aroundbut if you switched to 160mm arms using 44/16 its going to feel harderto pedal now since you have taken away some torque ratio from the crank arm leingthso maby a 42 tooth sprocket would give the same "normal bmx feeling" when pedaling around?its all personal preferance realley.ive used crank arms from 145 to 185 and luckly had enough parts avalable to swap around until I found the desired ratios I wanted for myself.for flatlanding - i enjoy using 160mm arms and 22/9 gear ratio.and for all around use I still use 160mm arms but go 24/9 for more top speed at the cost of low end take off power.