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changing from a 12 to an 11(4 posts)

changing from a 12 to an 11Gall
May 10, 2002 2:09 PM

i am using a dura ace 12-27 (i like my 27 bail out). i am thinking about putting on on an 11.

besides the 11 do i need a different spacer or anything else.

will i notice much increase downhill speed with the 11?

thanks for you help once again!
re: changing from a 12 to an 11atpjunkie
May 10, 2002 2:25 PM
difference is minimal. 11T cog also is exposed to tons of torque stress and wears fast. Personally I'd save the dough, I run a 12T cog and I can still pedal (power to wheel in the high 40's lo 50's) which is faster than alot of cyclist are comfortable with. The 11 may help you in the 50+ mph range downhill.
Might get interesting.Spoke Wrench
May 10, 2002 5:30 PM
What cogs do you want for the rest of the cassette?

First position cogs are different from the others because they have the spacer built it. Many of the larger cogs are rivited together on a carrier so changing the stock combinations on these will take some doing. The relationship of the shift ramps and funny shaped teeth will also be upset so the whole combination might not shift as well.

It looks to me like swaping the 12 for an 11 would be a piece of cake. Building an 11 to 27 cassette with evenly spaced jumps might not be so easy.
re: changing from a 12 to an 11legs
May 11, 2002 8:03 AM
something tells me thart if you need a 27 that you wont really need an 11.. you might be better off working on your leg power...
(this is not a flame)..
it doesnt sound like you will use the 11 for anything but the smallest parts of some descents...

I would put an 11 on if you find that you are spinning out in some races or tt's and that this is costing you the podium..
otherwise i would keep the twelve and focus on my spin as well as my power..
you know?

sometimes i notice my ego makes me want things for my bike (and thats ok) but i'll bet you will get more fun out of having really functional gear ratios..

or put on an 11.. and enjoy...